ORCID Profile
0000-0003-0090-0896
Current Organisations
Universidade Federal Fluminense
,
Southern Cross University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Geochemistry | Isotope Geochemistry | Chemical Oceanography | Carbon Sequestration Science | Soil Sciences | Ecological Applications | Inorganic Geochemistry | Marine Geoscience | Geochronology | Animal Physiological Ecology | Ecological Impacts of Climate Change | Soil Chemistry (excl. Carbon Sequestration Science) | Environmental Chemistry (incl. Atmospheric Chemistry) | Land Capability and Soil Degradation | Environmental Rehabilitation (excl. Bioremediation) |
ANZSRC Socio-Economic Objective (SEO)
Ecosystem Assessment and Management of Coastal and Estuarine Environments | Ecosystem Adaptation to Climate Change | Coastal and Estuarine Land Management | Physical and Chemical Conditions of Water in Coastal and Estuarine Environments | Coastal and Estuarine Water Management | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Climate Variability (excl. Social Impacts) | Coastal and Estuarine Soils | Remnant Vegetation and Protected Conservation Areas in Coastal and Estuarine Environments | Expanding Knowledge in the Environmental Sciences | Ecosystem Assessment and Management of Marine Environments
Related Links
Publications
Increasing Rates of Carbon Burial in Southwest Florida Coastal Wetlands
Publisher: American Geophysical Union (AGU)
Date: 02-2020
DOI: 10.1029/2019JG005349
Mapping short-lived radium isotopes in estuarine residential canals (Gold Coast, Australia)
Publisher: Springer Science and Business Media LLC
Date: 23-06-2017
Major element concentrations in Mangrove Pore Water, Sepetiba Bay, Brazil
Publisher: FapUNIFESP (SciELO)
Date: 03-2012
DOI: 10.1590/S1679-87592012000100004
Abstract: Concentrations of cations and anions of major elements (Na+, Ca2+, Mg2+, K+, Cl-, SO4 2-) were analyzed in the pore water of a mangrove habitat. Site specific major element concentrations were identified along a four piezometric well transect, which were placed in distinct geobotanic facies. Evapotranspiration was evident in the apicum station, given the high salinity and major element concentrations. The station landward of an apicum was where major element/Cl- ratios standard deviations are greatest, suggesting intense in situ diagenesis. Molar ratios in the most continental station (4) are significantly lower than the nearby freshwater source, indicating a strong influence of sea water flux into the outer reaches of the mangrove ecosystem and encroaching on the Atlantic rain forest. Indeed, the SO4 2-/Cl- and Ca2+/Cl- ratios suggest limited SO4 2- reduction and relatively high Ca2+/Cl- ratios indicate a region of recent saltwater contact.
Arsenic fractionation in estuarine sediments: Does coastal eutrophication influence As behavior?
Publisher: Elsevier BV
Date: 07-2015
DOI: 10.1016/J.MARPOLBUL.2015.04.037
Abstract: The Paranaguá Estuarine Complex (PEC) includes the naturally oligotrophic (NO) Mel Island which is surrounded by sea grasses, a naturally eutrophic (NE) Benito Inlet adjacent to mangrove wetlands and the highly impacted eutrophic (IE) Paranaguá Bay, home of one of Brazil's largest ports. The results from this study indicate that reactive As and pyrite increase with sediment depth near Paranaguá port in the IE region. At the NE region, near a mangrove fringe, the reactive As, Fe, Mn and pyrite remained relatively high along the sediment column while near the sea grasses at NO the As contents were low. The degree of trace metal pyritization (DTMP) and the degree of pyritization (DOP) was highest at the IE site, slightly increasing with depth. These baseline results indicate that influence of trophic conditions and presence of marine vegetation may be directly related to As behavior in coastal systems.
Land use and episodic rainfall as drivers of nitrogen exports in subtropical rivers: Insights from δ15N-NO3 −, δ18O-NO3 − and 222Rn
Publisher: Elsevier BV
Date: 03-2021
Hypersaline tidal flats as important “blue carbon” systems: a case study from three ecosystems
Publisher: Copernicus GmbH
Date: 22-04-2021
Abstract: Abstract. Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones with no major fluvial contributions. Here, we estimate that organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) were buried at rates averaging 21 (±6), 1.7 (±0.3) and 1.4 (±0.3) gm-2yr-1, respectively, during the previous century in three contrasting HTF systems, one in Brazil (eutrophic) and two in Australia (oligotrophic). Although these rates are lower than those from nearby mangrove, saltmarsh and seagrass systems, the importance of HTFs as sinks for OC, TN and TP may be significant given their extensive coverage. Despite the measured short-term variability between net air–saltpan CO2 influx and emission estimates found during the dry and wet season in the Brazilian HTF, the only site with seasonal CO2 flux measurements, the OC sedimentary profiles over several decades suggest efficient OC burial at all sites. Indeed, the stable isotopes of OC and TN (δ13C and δ15N) along with C:N ratios show that microphytobenthos are the major source of the buried OC in these HTFs. Our findings highlight a previously unquantified carbon as well as a nutrient sink and suggest that coastal HTF ecosystems could be included in the emerging blue carbon framework.
Anthropogenic and environmental influences on nutrient accumulation in mangrove sediments
Publisher: Elsevier BV
Date: 04-2021
Ecosystem carbon losses following a climate-induced mangrove mortality in Brazil
Publisher: Elsevier BV
Date: 11-2021
Radium isotope ( 223 Ra, 224 Ra, 226 Ra and 228 Ra) distribution near Brazil's largest port, Paranaguá Bay, Brazil
Publisher: Elsevier BV
Date: 10-2016
DOI: 10.1016/J.MARPOLBUL.2016.07.004
Abstract: This work investigates the (223)Ra, (224)Ra, (226)Ra and (228)Ra isotope distribution in river, estuarine waters and sediments of the Paranaguá Estuarine Complex (PEC). The stratification of the Ra isotopes along water columns indicate differing natural sources. In sediments, the radium isotope activities was inversely proportional to the particle size. The highest concentrations of (223)Ra, (224)Ra, (226)Ra and (228)Ra in the water column were found in the bottom more saline waters and towards the inner of the estuary. These relatively high concentrations towards the bottom of the estuary may be attributed to the influence of tidally driven groundwater source and desorption from particles at the maximum turbidity zone. The apparent river water ages from the radium isotope ratios, (223)Ra/(224)Ra and (223)Ra/(228)Ra, indicate that the principal rivers that flow into the estuary have residence times from between 6 and 11days.
Contrasting mercury and manganese deposition in a mangrove-dominated estuary (Guaratuba Bay, Brazil)
Publisher: Springer Science and Business Media LLC
Date: 30-04-2008
Mangrove mortality in a changing climate: An overview
Publisher: Elsevier BV
Date: 12-2018
Land use impacts on benthic bioturbation potential and carbon burial in Brazilian mangrove ecosystems
Publisher: Wiley
Date: 08-05-2020
DOI: 10.1002/LNO.11458
Role of carbonate burial in Blue Carbon budgets
Publisher: Springer Science and Business Media LLC
Date: 07-03-2019
DOI: 10.1038/S41467-019-08842-6
Abstract: Calcium carbonates (CaCO 3 ) often accumulate in mangrove and seagrass sediments. As CaCO 3 production emits CO 2 , there is concern that this may partially offset the role of Blue Carbon ecosystems as CO 2 sinks through the burial of organic carbon (C org ). A global collection of data on inorganic carbon burial rates (C inorg , 12% of CaCO 3 mass) revealed global rates of 0.8 TgC inorg yr −1 and 15–62 TgC inorg yr −1 in mangrove and seagrass ecosystems, respectively. In seagrass, CaCO 3 burial may correspond to an offset of 30% of the net CO 2 sequestration. However, a mass balance assessment highlights that the C inorg burial is mainly supported by inputs from adjacent ecosystems rather than by local calcification, and that Blue Carbon ecosystems are sites of net CaCO 3 dissolution. Hence, CaCO 3 burial in Blue Carbon ecosystems contribute to seabed elevation and therefore buffers sea-level rise, without undermining their role as CO 2 sinks.
Mangrove carbon and nutrient accumulation shifts driven by rapid development in a tropical estuarine system, northeast Brazil
Publisher: Elsevier BV
Date: 05-2021
Forest migration and carbon sources to Iranian mangrove soils
Publisher: Elsevier BV
Date: 10-2018
Electroanalytical Applications of Semiintegral and Convolution Voltammetry in Room-Temperature Ionic Liquids
Publisher: Springer International Publishing
Date: 2015
Does Regional Development Influence Sedimentary Blue Carbon Stocks? A Case Study From Three Australian Estuaries
Publisher: Frontiers Media SA
Date: 14-01-2019
Assinatura da deposição atmosférica de testes nucleares em sedimentos da costa brasileira (240+239Pu e 137Cs)
Publisher: FapUNIFESP (SciELO)
Date: 2012
Reconstructing extreme climatic and geochemical conditions during the largest natural mangrove dieback on record
Publisher: Copernicus GmbH
Date: 28-09-2020
Abstract: Abstract. A massive mangrove dieback event occurred in 2015–2016 along ∼1000 km of pristine coastline in the Gulf of Carpentaria, Australia. Here, we use sediment and wood chronologies to gain insights into geochemical and climatic changes related to this dieback. The unique combination of low rainfall and low sea level observed during the dieback event had been unprecedented in the preceding 3 decades. A combination of iron (Fe) chronologies in wood and sediment, wood density and estimates of mangrove water use efficiency all imply lower water availability within the dead mangrove forest. Wood and sediment chronologies suggest a rapid, large mobilization of sedimentary Fe, which is consistent with redox transitions promoted by changes in soil moisture content. Elemental analysis of wood cross sections revealed a 30- to 90-fold increase in Fe concentrations in dead mangroves just prior to their mortality. Mangrove wood uptake of Fe during the dieback is consistent with large apparent losses of Fe from sediments, which potentially caused an outwelling of Fe to the ocean. Although Fe toxicity may also have played a role in the dieback, this possibility requires further study. We suggest that differences in wood and sedimentary Fe between living and dead forest areas reflect sediment redox transitions that are, in turn, associated with regional variability in groundwater flows. Overall, our observations provide multiple lines of evidence that the forest dieback was driven by low water availability coinciding with a strong El Niño–Southern Oscillation (ENSO) event and was associated with climate change.
Spatial Variability of Organic Carbon, CaCO3 and Nutrient Burial Rates Spanning a Mangrove Productivity Gradient in the Coastal Everglades
Publisher: Springer Science and Business Media LLC
Date: 05-10-2018
Low carbon accumulation in a macro‐tidal mangrove forest on the Amazon coast
Publisher: Wiley
Date: 28-06-2023
DOI: 10.1002/LNO.12396
Abstract: The important role mangrove forests play in sequestering organic carbon is well known, yet rates of organic carbon accumulation in macro‐tidal mangrove ecosystems are poorly resolved. Here we use 210 Pb dating to present a 125‐yr record of carbon, nutrient and trace metal accumulation in sediments from an Amazon macro‐tidal mangrove forest. We find that the rate of organic carbon accumulation ranged from 23.7 to 74.7 g m −2 yr −1 (average 38 ± 13.5 g m −2 yr −1 ), significantly lower than global averages for mangrove forests. These low rates may be associated with sediment grain‐size and sediment–water interface processes that drive organic matter oxidation and reduce carbon stocks in these highly dynamic macro‐tidal forests. Total nitrogen accumulation ranged from 1.4 to 5.1 g m −2 yr −1 (average 2.7 ± 0.9 g m −2 yr −1 ) and phosphorus from 1.5 to 8.4 g m −2 yr −1 (average 4.3 ± 1.9 g m −2 yr −1 ). Trace metal accumulation rates (As, Pb, Cr, Cu, Mn, Ni, Zn, Hg, Bo, V, Co, Mo, S, and Ba) were also lower than other tropical mangrove forests globally, but trace metal in more recent sediments for Mn, As, Cu, and Hg were elevated, likely reflecting human footprint in the region since early the 20 th century. The ability to accurately quantify carbon accumulation rates in mangrove ecosystems is critical for climate change mitigation strategies and the implementation of carbon offset schemes globally.
Carbon outwelling across the shelf following a massive mangrove dieback in Australia: Insights from radium isotopes
Publisher: Elsevier BV
Date: 05-2019
Coupled anthropogenic anomalies of radionuclides and major elements in estuarine sediments
Publisher: Elsevier BV
Date: 08-2008
DOI: 10.1016/J.JENVRAD.2008.04.006
Abstract: Concentrations of fertilizer industry-derived P (up to 3.4%), Ca (up to 6.1%), (226)Ra (up to 744 Bq kg(-1)) and (210)Pb (up to 1317 Bq kg(-1)) at least one order of magnitude above natural levels were recorded in a sediment core from Morrão River estuary (SE Brazil). Unsupported (210)Pb (= total (210)Pb-(226)Ra) activities unexplained by atmospheric fallout and deviations from the radionuclides secular equilibrium also indicated strong anomalies. Anomalous constituents were positively correlated with each other and negatively correlated with clay mineral-bearing elements. These negative correlations were explained by a depletion of natural sediment constituents due to a dilution caused by elevated inputs of steel industry-derived elements (mainly by Fe levels up to 24%). Absolute data and normalizations by a proxy for clays (Al) and anthropogenic Fe evidenced variabilities in the quality of coastal and land-derived sediment inputs, mainly due to changes in the relative contributions from industrial sources.
Alkalinity export to the ocean is a major carbon sequestration mechanism in a macrotidal saltmarsh
Publisher: Wiley
Date: 13-06-2022
DOI: 10.1002/LNO.12155
Abstract: Saltmarshes are a blue carbon ecosystem accumulating large quantities of organic carbon in sediments. Some of this carbon can be transformed into dissolved inorganic carbon (DIC) and methane (CH 4 ) that may eventually be exported to the ocean or atmosphere. Although extensive studies have quantified specific components of the carbon budget such as carbon burial, limited attention has been given to pore‐water‐derived carbon and total alkalinity (TA) exports to the ocean. Here, we quantified lateral exports to the ocean (outwelling) of 202 ± 160 and 78 ± 75 mmol m −2 d −1 of DIC and TA, respectively. The TA : DIC concentration ratio in the creek waters was ~ 1, implying TA production from anaerobic mineralization in sediments. The lateral TA exports were comparable to the local (94 ± 48 mmol m −2 d −1 ) and national (~ 50 mmol m −2 d −1 ) organic carbon burial. High TA exports could locally increase the ocean buffering capacity and contribute bicarbonate to the coastal ocean, acting as a long‐term carbon storage. Pore water traced by radon contributed 28–37% and 58–69% of DIC and TA exports. Separating the two major DIC components (i.e., CO 2 emissions and alkalinity exports) is essential to resolve the carbon sequestration potential from saltmarshes. Here, dissolved CO 2 emissions to the atmosphere accounted for 3–5% of total DIC outwelling. CH 4 emissions played a minor role offsetting around 0.3 to 6% of the carbon sequestration. Overall, we demonstrate that alkalinity export into the ocean can be an overlooked carbon sequestration pathway in saltmarshes at rates comparable to carbon burial.
Uranium export from a sandy beach subterranean estuary in Australia
Publisher: Elsevier BV
Date: 11-2017
Elevated concentrations of dissolved Ba, Fe and Mn in a mangrove subterranean estuary: Consequence of sea level rise?
Publisher: Elsevier BV
Date: 07-2012
Local geomorphological gradients affect sedimentary organic carbon storage: A Blue Carbon case study from sub-tropical Australia
Publisher: Elsevier BV
Date: 06-2021
Alkalinity production coupled to pyrite formation represents an unaccounted blue carbon sink
Publisher: Wiley
Date: 17-08-2020
Changes in organic carbon accumulation driven by mangrove expansion and deforestation in a New Zealand estuary
Publisher: Elsevier BV
Date: 06-2017
Global blue carbon accumulation in tidal wetlands increases with climate change
Publisher: Oxford University Press (OUP)
Date: 15-12-2020
DOI: 10.1093/NSR/NWAA296
Abstract: Coastal tidal wetlands produce and accumulate significant amounts of organic carbon (C) that help to mitigate climate change. However, previous data limitations have prevented a robust evaluation of the global rates and mechanisms driving C accumulation. Here, we go beyond recent soil C stock estimates to reveal global tidal wetland C accumulation and predict changes under relative sea level rise, temperature and precipitation. We use data from literature study sites and our new observations spanning wide latitudinal gradients and 20 countries. Globally, tidal wetlands accumulate 53.65 (95%CI: 48.52–59.01) Tg C yr−1, which is ∼30% of the organic C buried on the ocean floor. Modeling based on current climatic drivers and under projected emissions scenarios revealed a net increase in the global C accumulation by 2100. This rapid increase is driven by sea level rise in tidal marshes, and higher temperature and precipitation in mangroves. Countries with large areas of coastal wetlands, like Indonesia and Mexico, are more susceptible to tidal wetland C losses under climate change, while regions such as Australia, Brazil, the USA and China will experience a significant C accumulation increase under all projected scenarios.
Examining 239+240 Pu, 210 Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia
Publisher: Elsevier BV
Date: 2016
DOI: 10.1016/J.JENVRAD.2015.04.018
Abstract: Two sediment cores were collected in a mangrove forest to construct geochronologies for the previous century using natural and anthropogenic radionuclide tracers. Both sediment cores were dated using (239+240)Pu global fallout signatures as well as (210)Pb, applying both the Constant Initial Concentration (CIC) and the Constant Rate of Supply (CRS) models. The (239+240)Pu and CIC model are interpreted as having comparable sediment accretion rates (SAR) below an apparent mixed region in the upper ∼5 to 10 cm. In contrast, the CRS dating method shows high sediment accretion rates in the uppermost intervals, which is substantially reduced over the lower intervals of the 100-year record. A local anthropogenic nutrient signal is reflected in the high total phosphorus (TP) concentration in younger sediments. The carbon/nitrogen molar ratios and δ(15)N values further support a local anthropogenic nutrient enrichment signal. The origin of these signals is likely the treated sewage discharge to Moreton Bay which began in the early 1970s. While the (239+240)Pu and CIC models can only produce rates averaged over the intervals of interest within the profile, the (210)Pb CRS model identifies elevated rates of sediment accretion, organic carbon (OC), nitrogen (N), and TP burial from 2000 to 2013. From 1920 to 2000, the three dating methods provide similar OC, N and TP burial rates, ∼150, 10 and 2 g m(-2) year(-1), respectively, which are comparable to global averages.
Recent 137Cs deposition in sediments of Admiralty Bay, Antarctica
Publisher: Elsevier BV
Date: 05-2010
DOI: 10.1016/J.JENVRAD.2010.02.006
Abstract: Cesium-137, radium-226 and lead-210 profiles of a 25 cm sediment core give an indication of recent changes in land-ocean interactions at a polar coastal environment (Admiralty Bay, King George Island, Antarctica). The linear sedimentation accumulation rate at the study site calculated from the unsupported (210)Pb profile was 6.7 mm/year from 1965 to 2005. A 3.5-fold increase in (137)Cs concentrations was observed in the top layer of this sediment core. This sharp increase seems to indicate a recent redistribution of fallout radionuclides previously deposited on soil, vegetation and snow. These results imply enhanced land-ocean interactions at this site likely as a result of climate change. Because our results are based on a single core, additional investigations are needed to confirm our observations.
Large variability in organic carbon and CaCO3 burial in seagrass meadows: a case study from three Australian estuaries
Publisher: Inter-Research Science Center
Date: 09-05-2019
DOI: 10.3354/MEPS12955
Auto-HPGe, an autosampler for gamma-ray spectroscopy using high-purity germanium (HPGe) detectors and heavy shields
Publisher: Elsevier BV
Date: 10-2018
Carbon accumulation and storage capacity in mangrove sediments three decades after deforestation within a eutrophic bay
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.MARPOLBUL.2017.11.018
Abstract: A dated sediment core from an eutrophic mangrove area presented non-significant differences in carbon accumulation rates before (55.7±10.2gm
Alkalinity Production Coupled to Pyrite Formation Represents an Unaccounted Blue Carbon Sink
Publisher: American Geophysical Union (AGU)
Date: 04-2021
DOI: 10.1029/2020GB006785
Abstract: Blue carbon ecosystems, including mangroves, saltmarshes, and seagrasses, mitigate climate change by storing atmospheric carbon. Previous blue carbon research has focused on organic carbon stocks. However, recent studies suggest that lateral inorganic carbon export might be equally important. Lateral export is a long‐term carbon sink if carbon is exported as alkalinity (TAlk) produced via sulfate reduction coupled to pyrite formation. This study evaluates drivers of pyrite formation in blue carbon ecosystems, compares pyrite production to TAlk outwelling rates, and estimates global pyrite stocks in mangroves. We quantified pyrite stocks in mangroves, saltmarshes, and seagrasses along a latitudinal gradient on the Australian East Coast, including a mangrove dieback area, and in the Everglades (Florida, USA). Our results indicate that pyrite stocks were driven by a combination of biomass, tidal litude, sediment organic carbon, sediment accumulation rates, rainfall, latitude, temperature, and iron availability. Pyrite stocks were three‐times higher in mangroves (103 ± 61 Mg/ha) than in saltmarshes (30 ± 30 Mg/ha) and seagrasses (32 ± 1 Mg/ha). Mangrove pyrite stocks were linearly correlated to TAlk export at sites where sulfate reduction was the dominant TAlk producing process. However, pyrite generation could not explain all TAlk outwelling. We present the first global model estimating pyrite stocks in mangroves, giving a first‐order estimate of 197 Mg/ha (RMSE = 24 Mg/ha). In mangroves, estimated global TAlk production coupled to pyrite formation (∼3 mol/m 2 /y) is equal to ∼24% of their global carbon burial rate, highlighting the importance of including TAlk export in future blue carbon budgets.
Nitrous oxide hot moments and cold spots in a subtropical estuary: Floods and mangroves
Publisher: Elsevier BV
Date: 2022
Coastal carbon cycle changes following mangrove loss
Publisher: Wiley
Date: 02-07-2020
DOI: 10.1002/LNO.11476
Abstract: Global mangrove loss is occurring from deforestation and extreme climatic events, but changes to the coastal carbon cycle following mangrove mortality and/or loss are not well understood. In 2015/2016, a massive climate‐driven mangrove dieback event occurred over ~ 1000 km of Australian coastline. To assess carbon loss following mortality, carbon fluxes in adjacent living and dead forest areas were compared 8 and 20 months postforest dieback. Dead areas experienced an increase in soil CO 2 efflux by ~ 189%, and a decrease in oceanic dissolved inorganic carbon (DIC) outwelling of ~ 50% relative to living areas. DIC outwelling (predominantly carbonate alkalinity) and soil CO 2 efflux accounted for 81% and 16% of losses from the living forest, in comparison to 51% and 47%, respectively, from the dead forest. The dieback drove a shift from a dominance of oceanic carbon outwelling to increased atmospheric CO 2 emissions and decreased alkalinity exports. This shift was likely driven by increased oxygen sediment permeation and the loss of mangrove net primary productivity. Combining our new observations with literature data, we found a logarithmic relationship between soil carbon loss and time since mangrove loss. Using this relationship, we estimate ongoing global carbon losses from historical mangrove deforestation and dieback could be 13.7 ± 9.4 Tg C yr −1 , which is eightfold higher than previous estimates and offsets global mangrove carbon burial by ~ 60%. Even if no future deforestation occurred, we estimate ongoing carbon losses to the atmosphere and ocean from current global mangrove losses of 27 Tg C over the next 30 yr.
Avoiding timescale bias in assessments of coastal wetland vertical change
Publisher: Wiley
Date: 31-01-2018
DOI: 10.1002/LNO.10783
Organic Matter Redox State Driven by Specific Sources in Mangrove Sediments: A Case Study from Peruvian Ecosystems
Publisher: MDPI AG
Date: 15-12-2021
DOI: 10.3390/JMSE9121438
Abstract: In order to determine the organic matter redox state in relation to specific sources in mangrove sediments, two 60 cm-long sediment cores were collected from mangrove-covered and mudflat zones within a mangrove forest in Peru. Sediment subs les from these cores were analyzed to determine δ13C values and C:N ratios, whereas two redox indices, namely, electrochemical (fEAOM) and spectroscopical (A1650/A3400) indices, were taken from a previous study and correlated with the geochemical indices obtained from this work. These indices may provide accurate information on sedimentary organic matter diagenesis by oxidative processes through its redox state. The results show that the electrochemical index (fEAOM) and the spectroscopical index (A1650/A3400) for mangrove-covered sediments exhibited a positive correlation with δ13C values and a negative correlation with C:N molar ratios. These correlations suggest that the more labile sedimentary organic matter derived from non-terrestrial sources is in a more oxidized state than that derived from mangrove vegetation. However, this was not valid for mudflat zones, where non-significant correlations between geochemical indices were observed. Furthermore, the results suggest that the redox state of the organic matter deposited over time is dependent on source mixing influences, being better preserved in the presence of mangrove-derived organic matter.
Factors influencing organic carbon accumulation in mangrove ecosystems
Publisher: The Royal Society
Date: 10-2018
Abstract: There is growing interest in the capacity of mangrove ecosystems to sequester and store ‘blue carbon’. Here, we provide a synthesis of 66 dated sediment cores with previously calculated carbon accumulation rates in mangrove ecosystems to assess the effects of environmental and anthropogenic pressures. Conserved sedimentary environments were found to be within the range of the current global average for sediment accretion (approx. 2.5 mm yr –1 ) and carbon accumulation (approx. 160 g m −2 yr −1 ). Moreover, similar sediment accretion and carbon accumulation rates were found between mixed and monotypic mangrove forests, however higher mean and median values were noted from within the forest as compared to adjacent areas such as mudflats. The carbon accumulation within conserved environments was up to fourfold higher than in degraded or deforested environments but threefold lower than those impacted by domestic or aquaculture effluents (more than 900 g m −2 yr −1 ) and twofold lower than those impacted by storms and flooding (more than 500 g m −2 yr −1 ). These results suggest that depending on the type of impact, the blue carbon accumulation capacity of mangrove ecosystems may become substantially modified.
Groundwater discharge into an estuary using spatially distributed radon time series and radium isotopes
Publisher: Elsevier BV
Date: 09-2015
Manganese and iron release from mangrove porewaters: A significant component of oceanic budgets?
Publisher: Elsevier BV
Date: 08-2016
Contrasting Radium-Derived Groundwater Exchange and Nutrient Lateral Fluxes in a Natural Mangrove Versus an Artificial Canal
Publisher: Springer Science and Business Media LLC
Date: 28-07-2020
Significant Organic Carbon Accumulation in Two Coastal Acid Sulfate Soil Wetlands
Publisher: American Geophysical Union (AGU)
Date: 20-03-2019
DOI: 10.1029/2019GL082076
Anthropogenic source assessment of 226Ra and 210Pb in a sediment core from the Cubatão River estuary (SE Brazil)
Publisher: Springer Science and Business Media LLC
Date: 05-09-2010
Are global mangrove carbon stocks driven by rainfall?
Publisher: American Geophysical Union (AGU)
Date: 10-2016
DOI: 10.1002/2016JG003510
Organic carbon burial rates in mangrove sediments: Strengthening the global budget
Publisher: American Geophysical Union (AGU)
Date: 04-08-2012
DOI: 10.1029/2012GB004375
Assessment of the temporal retention of mercury and nutrient records within the mangrove sediments of a highly impacted estuary
Publisher: Elsevier BV
Date: 04-2022
DOI: 10.1016/J.ENVRES.2021.112569
Abstract: Mangrove ecosystems are dynamic and bio erse environments with the capacity to sequester more organic carbon per unit area, per time, than terrestrial forests, yet are among one of the most heavily degraded ecosystems on Earth. Here, we quantify trace metal, nutrient and carbon accumulation rates in a tropical mangrove environment in northeast Brazil, a region that has been rapidly developed over the past seven decades. Carbon accumulation rate results show modest or no increase since the 1950's, when major development occurred in the region. Organic carbon isotope (δ
Linking climatic-driven iron toxicity and water stress to a massive mangrove dieback
Publisher: Copernicus GmbH
Date: 16-01-2020
DOI: 10.5194/BG-2019-478
Abstract: Abstract. A massive mangrove dieback event occurred in 2015/2016 along ~ 1000 km of pristine coastline in the Gulf of Carpentaria, Australia. To gain insights into dieback drivers, we combine sediment and wood chronologies to analyze geochemical and climatic changes. The unique combination of low rainfall and low sea level observed during the dieback event was unprecedented in the previous three decades. Multiple lines of evidence from iron (Fe) chronologies in wood and sediment, wood densities and mangrove water use efficiency suggest low water availability within the dead mangrove forest. Wood and sediment chronologies suggest a rapid and large mobilization of sedimentary Fe, which was likely associated with pyrite oxidation within mangrove sediments. High resolution elemental analysis of wood cross sections revealed 30–90 fold increase in Fe concentrations in dead mangrove areas just prior to mortality. Fe concentrations in wood s les correlated strongly with the El Niño Southern Oscillation (ENSO) index, suggesting ENSO was a major driver of Fe mobilization. Large Fe losses from sediments during the dieback are consistent with Fe uptake in the trees, further implying sediment pyrite oxidation. If our data are representative of the entire dieback region, we estimate that the dieback drove the mobilization and loss of 50 ± 173 Gg Fe, equivalent to 8–50 % of annual global atmospheric Fe deposition into the oceans, which is one of the major drivers of surface ocean productivity. Overall, our observations support the hypothesis that the forest dieback was associated with low water availability and Fe toxicity driven by a strong ENSO event.
Factors Determining Seagrass Blue Carbon Across Bioregions and Geomorphologies
Publisher: American Geophysical Union (AGU)
Date: 06-2021
DOI: 10.1029/2021GB006935
Abstract: Seagrass meadows rank among the most significant organic carbon (C org ) sinks on earth. We examined the variability in seagrass soil C org stocks and composition across Australia and identified the main drivers of variability, applying a spatially hierarchical approach that incorporates bioregions and geomorphic settings. Top 30 cm soil C org stocks were similar across bioregions and geomorphic settings (min‐max: 20–26 Mg C org ha −1 ), but meadows formed by large species (i.e., Amphibolis spp. and Posidonia spp.) showed higher stocks (24–29 Mg C org ha −1 ) than those formed by smaller species (e.g., Halodule, Halophila, Ruppia, Zostera, Cymodocea, and Syringodium 12–21 Mg C org ha −1 ). In temperate coastal meadows dominated by large species, soil C org stocks mainly derived from seagrass C org (72 ± 2%), while allochthonous C org dominated soil C org stocks in meadows formed by small species in temperate and tropical estuarine meadows (64 ± 5%). In temperate coastal meadows, soil C org stocks were enhanced by low hydrodynamic exposure associated with high mud and seagrass C org contents. In temperate estuarine meadows, soil C org stocks were enhanced by high contributions of seagrass C org , low to moderate solar radiation, and low human pressure. In tropical estuarine meadows formed by small species, large soil C org stocks were mainly associated with low hydrodynamic energy, low rainfall, and high solar radiation. These results showcase that bioregion and geomorphic setting are not necessarily good predictors of soil C org stocks and that site‐specific estimates based on local environmental factors are needed for Blue Carbon projects and greenhouse gases accounting purposes.
High porewater exchange in a mangrove-dominated estuary revealed from short-lived radium isotopes
Publisher: Elsevier BV
Date: 10-2017
Organic matter processing through an estuarine system: Evidence from stable isotopes (δ13C and δ15N) and molecular (lignin phenols) signatures
Publisher: Elsevier BV
Date: 02-2022
A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures
Publisher: FapUNIFESP (SciELO)
Date: 2011
Seagrass, mangrove and saltmarsh sedimentary carbon stocks in an urban estuary; Coffs Harbour, Australia
Publisher: Elsevier BV
Date: 11-2016
Carbon outwelling and outgassing vs. burial in an estuarine tidal creek surrounded by mangrove and saltmarsh wetlands
Publisher: Wiley
Date: 02-01-2019
DOI: 10.1002/LNO.11090
Correction: Global patterns in mangrove soil carbon stocks and losses (Nature Climate Change (2017) DOI: 10.1038/nclimate3326)
Publisher: Springer Science and Business Media LLC
Date: 27-11-2018
Mercury deposition during the previous century in an upwelling region; Cabo Frio, Brazil
Publisher: Elsevier BV
Date: 11-2013
DOI: 10.1016/J.MARPOLBUL.2013.07.049
Abstract: To investigate the upwelling influence on Hg biogeochemical cycles and the sedimentological changes during the previous ≈ 150 years, four sediment box-cores were s led along an inshore offshore transect on the Southeastern Brazilian continental shelf. Mercury values were found to be relatively low, with means ranging between 8.08 and 30.4 ng g(-1). Mercury fluxes along the sediment cores are directly related to the well documented historical regional activity and global atmospheric deposition. The narrow relationship between mercury and organic carbon suggest that upwelling phenomenon and primary production may play an important role on Hg input and distribution along continental shelf depositional settings.
Reconstructing the history of environmental impact in a tropical mangrove ecosystem: A case study from the Suape port-industrial complex, Brazil
Publisher: Elsevier BV
Date: 05-2021
Electrochemical characterization of mangrove sediments: A proposal of new proxies for organic matter oxidation
Publisher: Elsevier BV
Date: 02-2019
Global patterns in mangrove soil carbon stocks and losses
Publisher: Springer Science and Business Media LLC
Date: 26-06-2017
DOI: 10.1038/NCLIMATE3326
Submarine groundwater discharge and associated nutrient and carbon inputs into Sydney Harbour (Australia)
Publisher: Elsevier BV
Date: 2020
Origin of rare earth element anomalies in mangrove sediments, Sepetiba Bay, SE Brazil: used as geochemical tracers of sediment sources
Publisher: Springer Science and Business Media LLC
Date: 12-02-2011
Seasonal changes in metal and nutrient fluxes across the sediment-water interface in tropical mangrove creeks in the Amazon region
Publisher: Elsevier BV
Date: 03-2022
Carbon and nutrient accumulation in tropical mangrove creeks, Amazon region
Publisher: Elsevier BV
Date: 11-2020
The contribution of denitrification and burial to the nitrogen budgets of three geomorphically distinct Australian estuaries: Importance of seagrass habitats
Publisher: No publisher found
Date: 2016
DOI: 10.1002/LNO.10280
Influence of anthropogenic activities on trace metal accumulation in Brazilian mangrove sediments
Publisher: Sociedade Brasileira de Quimica (SBQ)
Date: 2017
Radionuclide Enrichment Near Coal Processing in Southern Brazil
Publisher: Pleiades Publishing Ltd
Date: 03-2018
Eutrophication history of Guanabara Bay (SE Brazil) recorded by phosphorus flux to sediments from a degraded mangrove area
Publisher: Elsevier BV
Date: 11-2009
Cryptic night-time trace metal and metalloid contamination in an intensively cultivated coastal catchment
Publisher: Elsevier BV
Date: 05-2021
Geochemical background indicators within a tropical estuarine system influenced by a port-industrial complex
Publisher: Elsevier BV
Date: 12-2020
Reply to Comment by R. Parkinson on “Increasing Rates of Carbon Burial in Southwest Florida Coastal Wetlands” by J. Breithaupt et al.
Publisher: American Geophysical Union (AGU)
Date: 04-2021
DOI: 10.1029/2021JG006245
Intertidal mangrove mudflat 240+239Pu signatures, confirming a 210Pb geochronology on the southeastern coast of Brazil
Publisher: Springer Science and Business Media LLC
Date: 30-12-2009
Radon-traced pore-water as a potential source of CO2 and CH4 to receding black and clear water environments in the Amazon Basin
Publisher: Wiley
Date: 07-08-2018
DOI: 10.1002/LOL2.10089
Abstract: Groundwater is a primary source of dissolved CO 2 and CH 4 in Amazonian headwaters, yet in higher order rivers, a groundwater ore‐water source is difficult to constrain due to the high spatial and temporal heterogeneity of pore‐water exchange. Here, we report coupled, high resolution measurements of p CO 2 , CH 4 , and 222 Rn (a natural pore‐water and groundwater tracer) during receding waters in the three major water types of the Central Amazon Basin: black (Negro River) clear (Tapajós River) white (Madeira River). Considerable spatial heterogeneity was observed in p CO 2 , CH 4 , and 222 Rn concentrations ranging from 460 μatm to 8030 μatm, 7 nM to 281 nM, and 713 dpm m −3 to 8516 dpm m −3 , respectively. The significant correlations between p CO 2 and CH 4 to 222 Rn in the black and clear waters suggests that pore‐water further enhanced CO 2 supersaturation by 18–47% and is a driver of CH 4 dynamics in these waters.
Habitat rehabilitation in the Detroit River Area of Concern
Publisher: Michigan State University Press
Date: 02-10-2018
DOI: 10.1080/14634988.2018.1536437
Abstract: Loss and degradation of fish and wildlife habitat is a long-standing issue in the Detroit River. The Detroit River Remedial Action Plan helped agencies and stakeholder groups reach agreement on impaired beneficial uses, including loss of fish and wildlife habitat, and helped mobilize all stakeholders to rehabilitate habitat. Many organizations played key roles, including the Detroit River Public Advisory Council, Detroit River Canadian Cleanup, State of the Strait Conferences, American and Canadian Heritage River Initiatives, Detroit River International Wildlife Refuge, and Western Lake Erie Watersheds Priority Natural Area. Accomplishments include: 14 habitat restoration projects on both the Canadian and U.S. side of the Detroit River 53 soft shoreline engineering projects in the watershed nine fish spawning reefs in the river, Common Tern habitat in four locations and many wetland and green infrastructure projects. Based on Detroit River habitat restoration efforts over the last 32 years, the following advice is offered: reach agreement on severity and geographic extent of the problem practice adaptive management involve habitat experts up front in project design establish quantitative targets for project success ensure sound multidisciplinary technical support start with demonstration projects treat habitat projects as experiments involve citizen scientists in monitoring measure benefits communicate and celebrate successes promote education and outreach.
Partitioning the relative contributions of organic matter and mineral sediment to accretion rates in carbonate platform mangrove soils
Publisher: Elsevier BV
Date: 08-2017
Submarine groundwater discharge revealed by 224Ra and 223Ra in Coffs Harbour, Australia
Publisher: Springer Science and Business Media LLC
Date: 10-01-2019
Organic matter content and particle size modifications in mangrove sediments as responses to sea level rise
Publisher: Elsevier BV
Date: 06-2012
DOI: 10.1016/J.MARENVRES.2012.02.004
Abstract: Mangroves sediments contain large reservoirs of organic material (OM) as mangrove ecosystems produce large quantities and rapidly burial OM. Sediment accumulation rates of approximately 2.0 mm year(-1), based on (210)Pb(ex) dating, were estimated at the margin of two well-developed mangrove forest in southern Brazil. Regional data point to a relative sea level (RSL) rise of up to ∼4.0 mm year(-1). This RSL rise in turn, may directly influence the origin and quantity of organic matter (OM) deposited along mangrove sediments. Lithostratigraphic changes show that sand deposition is replacing the mud (<63 μm) fraction and OM content is decreasing in successively younger sediments. Sediment accumulation in coastal areas that are not keeping pace with sea level rise is potentially conducive to the observed shifts in particle size and OM content.
Hypersaline tidal flats as important Blue Carbon systems: A case study from three ecosystems
Publisher: Copernicus GmbH
Date: 24-11-2020
DOI: 10.5194/BG-2020-426
Abstract: Abstract. Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones with no major fluvial contributions. Here, we estimate that organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) are being buried at rates averaging 21 (± 6), 1.7 (± 0.3), and 1.4 (± 0.3) g m−2 y−1, respectively, during the previous century in three contrasting HTFs systems, one in Brazil (eutrophic) and two in Australia (oligotrophic). Although these rates are lower than those from nearby mangrove, saltmarsh and seagrass systems, the importance of HTFs as sinks for OC, TN and TP may be significant given their extensive coverage. Despite the measured short-term variability between net air-saltpan CO2 influx and emission estimates found during the dry and wet season in the Brazilian HTF, the only site with seasonal CO2 fluxes measurements, the OC sedimentary profiles over several decades suggests efficient OC burial at all sites. Indeed, the stable isotopes of OC and TN (δ13C and δ15N) along with C : N ratios show that microphytobenthos are the major source of the buried OC in these HTFs. Our findings highlight a previously unquantified carbon as well as nutrient sink and suggest that coastal HTF ecosystems could be included in the emerging blue carbon framework.
Mangrove forest sedimentation and its reference to sea level rise, Cananeia, Brazil
Publisher: Springer Science and Business Media LLC
Date: 19-08-2009
Author Correction: Tropical forests as drivers of lake carbon burial
Publisher: Springer Science and Business Media LLC
Date: 06-06-2023
Sediment accretion and organic carbon burial relative to sea-level rise and storm events in two mangrove forests in Everglades National Park
Publisher: Elsevier BV
Date: 05-2013
Tropical forests as drivers of lake carbon burial
Publisher: Springer Science and Business Media LLC
Date: 13-07-2022
DOI: 10.1038/S41467-022-31258-8
Abstract: A significant proportion of carbon (C) captured by terrestrial primary production is buried in lacustrine ecosystems, which have been substantially affected by anthropogenic activities globally. However, there is a scarcity of sedimentary organic carbon (OC) accumulation information for lakes surrounded by highly productive rainforests at warm tropical latitudes, or in response to land cover and climate change. Here, we combine new data from intensive c aigns spanning 13 lakes across remote Amazonian regions with a broad literature compilation, to produce the first spatially-weighted global analysis of recent OC burial in lakes (over ~50-100-years) that integrates both biome type and forest cover. We find that humid tropical forest lake sediments are a disproportionately important global OC sink of 7.4 Tg C yr −1 with implications for climate change. Further, we demonstrate that temperature and forest conservation are key factors in maintaining massive organic carbon pools in tropical lacustrine sediments.
Tidal wetland resilience to sea level rise increases their carbon sequestration capacity in United States
Publisher: Springer Science and Business Media LLC
Date: 28-11-2019
DOI: 10.1038/S41467-019-13294-Z
Abstract: Coastal wetlands are large reservoirs of soil carbon (C). However, the annual C accumulation rates contributing to the C storage in these systems have yet to be spatially estimated on a large scale. We synthesized C accumulation rate (CAR) in tidal wetlands of the conterminous United States (US), upscaled the CAR to national scale, and predicted trends based on climate change scenarios. Here, we show that the mean CAR is 161.8 ± 6 g Cm −2 yr −1 , and the conterminous US tidal wetlands sequestrate 4.2–5.0 Tg C yr −1 . Relative sea level rise (RSLR) largely regulates the CAR. The tidal wetland CAR is projected to increase in this century and continue their C sequestration capacity in all climate change scenarios, suggesting a strong resilience to sea level rise. These results serve as a baseline assessment of C accumulation in tidal wetlands of US, and indicate a significant C sink throughout this century.
Carbon outwelling and emissions from two contrasting mangrove creeks during the monsoon storm season in Palau, Micronesia
Publisher: Elsevier BV
Date: 03-2019
Carbon accumulation in Amazonian floodplain lakes: A significant component of Amazon budgets?
Publisher: Figshare
Date: 2016
Dissolved iron exports from an estuary surrounded by coastal wetlands: Can small estuaries be a significant source of Fe to the ocean?
Publisher: Elsevier BV
Date: 11-2015
Assessing pesticide, trace metal, and arsenic contamination in soils and dam sediments in a rapidly expanding horticultural area in Australia
Publisher: Springer Science and Business Media LLC
Date: 03-02-2021
Rare Earth Element and Radionuclide Distribution in Surface Sediments Along an Estuarine System Affected by Fertilizer Industry Contamination
Publisher: Springer Science and Business Media LLC
Date: 28-09-2013
Hydrologic fragmentation-induced eutrophication in Dove Sound, Upper Florida Keys, USA
Publisher: Springer Science and Business Media LLC
Date: 11-10-2013
The mangrove CO2 pump: Tidally driven pore‐water exchange
Publisher: Wiley
Date: 21-01-2021
DOI: 10.1002/LNO.11704
Hydrological controls on the biogeochemical dynamics in a Peruvian mangrove forest
Publisher: Springer Science and Business Media LLC
Date: 23-02-2017
Historic carbon burial spike in an Amazon floodplain lake linked to riparian deforestation near Santarém, Brazil
Publisher: Copernicus GmbH
Date: 22-01-2018
Abstract: Abstract. Forests along the Amazon Basin produce significant quantities of organic material, a portion of which is deposited in floodplain lakes. Deforestation in the watershed may then have potentially important effects on the carbon fluxes. In this study, a sediment core was extracted from an Amazon floodplain lake to examine the relationship between carbon burial and changing land cover and land use. Historical records from the 1930s and satellite data from the 1970s were used to calculate deforestation rates between 1930 to 1970 and 1970 to 2010 in four zones with different distances from the margins of the lake and its tributaries (100, 500, 1000 and 6000 m buffers). A sediment accumulation rate of ∼4 mm yr−1 for the previous ∼120 years was determined from the 240+239Pu signatures and the excess 210Pb method. The carbon burial rates ranged between 85 and 298 gCm-2yr-1, with pulses of high carbon burial in the 1950s, originating from the forest vegetation as indicated by δ13C and δ15N signatures. Our results revealed a potentially important spatial dependence of the organic carbon (OC) burial in Amazon lacustrine sediments in relation to deforestation rates in the catchment. These deforestation rates were more intense in the riparian vegetation (100 m buffer) during the period 1930 to 1970 and the larger open water areas (500, 1000 and 6000 m buffer) during 1970 to 2010. The continued removal of vegetation from the interior of the forest was not related to the peak of OC burial in the lake, but only the riparian deforestation which peaked during the 1950s. Therefore, this supports the conservation priority of riparian forests as an important management practice for Amazon flooded areas. Our findings suggest the importance of abrupt and temporary events in which some of the biomass released by deforestation, especially restricted to areas along open water edges, might reach the depositional environments in the floodplain of the Amazon Basin.
Carbon and Nitrogen Contents Driven by Organic Matter Source within Pichavaram Wetland Sediments
Publisher: MDPI AG
Date: 04-01-2022
DOI: 10.3390/JMSE10010053
Abstract: Differences in grain size, total organic carbon (OC), total nitrogen (TN), OC/TN ratios, and stable isotope (δ13C and δ15N) were assessed in sediments from areas covered by mangrove and saltmarsh vegetation within Pichavaram estuary (Southeast India). The mean percentage contents of silt and clays (70 vs. 19%), OC (5.7 vs. 2.0%), and TN (0.39 vs. 0.14%) were consistently higher in the mangrove as compared to those observed in the saltmarsh tidal zone. These differences may obey the higher deposition and retention of fine particles in the presence of a mangrove root system that may facilitate the accumulation and preservation of organic matter within these sedimentary systems. Further, higher OC and TN contents were associated to higher terrestrial or mangrove-derived organic matter contribution with lighter δ13C signatures (−26.0‰) in both sedimentary tidal zones, whereas lower OC and TN contents were associated to heavier δ13C signatures. This study is in agreement with previous studies which indicate that the presence of wetland vegetation may increase the carbon and nutrient storage capacity within estuarine ecosystems, highly relevant information for the establishment of further conservation strategies for blue carbon ecosystems at global scales.
Alkalinity Production Coupled to Pyrite FormationRepresents an Unaccounted Blue Carbon Sink
Publisher: Copernicus GmbH
Date: 28-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-9592
Abstract: & & Blue carbon ecosystems, including mangroves, saltmarshes, and seagrasses, mitigate climate& br& change by storing atmospheric carbon. Previous blue carbon research has focused on organic carbon& br& stocks. However, recent studies suggest that lateral inorganic carbon export might be equally important.& br& Lateral export is a long-term carbon sink if carbon is exported as alkalinity (TAlk) produced via sulfate& br& reduction coupled to pyrite formation. This study evaluates drivers of pyrite formation in blue carbon& br& ecosystems, compares pyrite production to TAlk outwelling rates, and estimates global pyrite stocks in& br& mangroves. We quantified pyrite stocks in mangroves, saltmarshes, and seagrasses along a latitudinal& br& gradient on the Australian East Coast, including a mangrove dieback area, and in the Everglades& br& (Florida, USA). Our results indicate that pyrite stocks were driven by a combination of biomass, tidal& br& litude, sediment organic carbon, sediment accumulation rates, rainfall, latitude, temperature, and& br& iron availability. Pyrite stocks were three-times higher in mangroves (103 & #177 61 Mg/ha) than in saltmarshes& br& (30 & #177 30 Mg/ha) and seagrasses (32 & #177 1 Mg/ha). Mangrove pyrite stocks were linearly correlated to& br& TAlk export at sites where sulfate reduction was the dominant TAlk producing process. However, pyrite& br& generation could not explain all TAlk outwelling. We present the first global model estimating pyrite& br& stocks in mangroves, giving a first-order estimate of 197 Mg/ha (RMSE = 24 Mg/ha). In mangroves,& br& estimated global TAlk production coupled to pyrite formation (& #8764 mol/m& sup& & /sup& /y) is equal to & #8764 % of their& br& global carbon burial rate, highlighting the importance of including TAlk export in future blue carbon& br& budgets.& &
Tidally driven sulfidic conditions in Peruvian mangrove sediments
Publisher: Springer Science and Business Media LLC
Date: 11-09-2018
Temporal variability of carbon and nutrient burial, sediment accretion, and mass accumulation over the past century in a carbonate platform mangrove forest of the Florida Everglades
Publisher: American Geophysical Union (AGU)
Date: 10-2014
DOI: 10.1002/2014JG002715
Elevated dissolved heavy metal discharge following rainfall downstream of intensive horticulture
Publisher: Elsevier BV
Date: 02-2020
Historic carbon burial spike in an Amazon floodplain lake linked to riparian deforestation near Santarem, Brazil
Publisher: Copernicus GmbH
Date: 17-05-2017
DOI: 10.5194/BG-2017-151
Abstract: Abstract. The forests along the Amazon Basin produce significant quantities of organic material, a portion of which is deposited in floodplain lakes. However, potentially important effects of ongoing deforestation in the watershed on these carbon fluxes is still poorly understood. Here, a sediment core was extracted from an Amazon floodplain lake to examine the relationship between carbon burial and land cover/use. Historical records from 1942 and satellite data from 1975 were used to calculate deforestation rates between 1942 and 1975, and 1975 to 2008 in four zones with different distances from the margins of the lake and its tributaries (100, 500, 1000 and 6000-m buffers). Sediment accumulation rates were determined from the 240& lus Pu signatures and the excess 210Pb method, reaching near 3.8 and 4.2 mm year−1 in the last 60 and 120 years respectively. The average carbon burial rates ranged between 100 and 350 g C m−2 year−1, with pulses of high carbon burial derived from the forest vegetation, as indicated by δ13C and δ15N signatures, which corresponded to heavy deforestation in the 1940 and 50s. Finally, our results revealed a potentially important spatial dependence of the OC burial in Amazon lacustrine sediments in relation to deforestation rates in the catchment. These deforestation rates were more intense in the riparian vegetation (100-m buffer) during the period 1942–1975 and the larger open water areas (500, 1000 and 6000-m buffer) during 1975–2008. The continued removal of vegetation from the interior of the forest was not related to the peak of OC burial in the lake, but only the riparian deforestation around 1950. Our novel findings suggest the importance of abrupt and temporary events in which some of the biomass released by the deforestation, especially restricted to areas along open water edges, might reach the depositional environments in the floodplain of the Amazon Basin.
Analysis of 210Po, 210Bi, and 210Pb in atmospheric and oceanic samples by simultaneously auto-plating 210Po and 210Bi onto a nickel disc
Publisher: Elsevier BV
Date: 09-2020
Organic carbon burial in a mangrove forest, margin and intertidal mud flat
Publisher: Elsevier BV
Date: 12-2010
Natural attenuation of large anthropogenic nitrate loads in a subtropical stream revealed by δ15N and δ18O
Publisher: Elsevier BV
Date: 07-2021
Mercury dilution by autochthonous organic matter in a fertilized mangrove wetland
Publisher: Elsevier BV
Date: 06-2016
DOI: 10.1016/J.ENVPOL.2016.02.002
Abstract: A dated sediment core from a highly-fertilized mangrove wetland located in Cubatão (SE Brazil) presented a negative correlation between mercury (Hg) and organic carbon contents. This is an unusual result for a metal with well-known affinity to organic matter. A dilution of Hg concentrations by autochthonous organic matter explained this observation, as revealed by carbon stable isotopes signatures (δ(13)C). Mercury dilution by the predominant mangrove-derived organic matter counterbalanced the positive influences of algal-derived organic matter and clay contents on Hg levels, suggesting that deleterious effects of Hg may be attenuated. Considering the current paradigm on the positive effect of organic matter on Hg concentrations in coastal sediments and the expected increase in mangrove organic matter burial due to natural and anthropogenic stimulations of primary production, predictions on the influences of organic matter on Hg accumulation in mangrove wetlands deserve caution.
Elevated rates of organic carbon, nitrogen, and phosphorus accumulation in a highly impacted mangrove wetland
Publisher: American Geophysical Union (AGU)
Date: 09-04-2014
DOI: 10.1002/2014GL059789
A global map of mangrove forest soil carbon at 30 m spatial resolution
Publisher: IOP Publishing
Date: 30-04-2018
240+239Pu depositional signatures as a viable geochronological tool in the Amazon Basin
Publisher: Walter de Gruyter GmbH
Date: 2017
Abstract: Anthropogenic radionuclide signatures associated with nuclear testing are increasingly utilized in environmental science to explore recent sedimentation. In this study, we assess the suitability of Pu radioisotope analysis in floodplain lake environments in the Amazon Basin to form geochronologies during the 20 th century. The 240 Pu + 239 Pu ( 240+239 Pu) signatures in six sediment cores indicate sediment accumulation rates in the floodplain lakes of the major rivers Amazon (2.3 mm year -1 ), Tapajos (10.2 and 2.4 mm year -1 ) and Madeira (3.4, 4.2 and 6.2 mm year -1 ). The results from this study show that 240+239 Pu fallout activities, and the well documented ( 240 Pu/ 239 Pu) atomic ratios of the above ground nuclear tests which began in the 1950’s, are sufficient and well preserved in Amazon floodplain lake sediments to infer chronologies. Lead-210 dating analyses in the same sediment cores produced comparable sediment accumulation rates at three of the six sites. The differences between dating methods may be attributed to the different time scale these dating methods represent and/or in the solubility between Pb and Pu along the sediment column. The geochronologies derived from the 240+239 Pu and 210 Pb dating methods outlined in this work are of interest to identify the effects of changing sediment accumulation rates during the previous century as a result of development, including deforestation, along the Amazon Basin which increased towards the middle of the 20 th century. This study shows that Pu dating provides a viable alternative geochronology tool for recent sediment accumulation (previous ~60 years) along the Amazon Basin.
Bacterial-derived nutrient and carbon source-sink behaviors in a sandy beach subterranean estuary
Publisher: Elsevier BV
Date: 11-2020
Spatial and temporal variability of carbon dioxide and methane fluxes over semi-diurnal and spring–neap–spring timescales in a mangrove creek
Publisher: Elsevier BV
Date: 02-2015
Organic carbon accumulation in oligotrophic coastal lakes in southern Brazil during the last century
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Author Correction: Tidal wetland resilience to sea level rise increases their carbon sequestration capacity in United States
Publisher: Springer Science and Business Media LLC
Date: 11-12-2019
DOI: 10.1038/S41467-019-13800-3
Abstract: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Mercury flux to estuarine sediments, derived from Pb-210 and Cs-137 geochronologies (Guaratuba Bay, Brazil)
Publisher: Elsevier BV
Date: 09-2006
DOI: 10.1016/J.MARPOLBUL.2006.06.004
Abstract: A sediment core from Guaratuba Bay was used to indicate possible Hg modifications to this coastal environment brought about by growing agricultural activity. Sedimentation rates were estimated to be 6.1 mm/year and 5.2 mm/year through 210Pb and 137Cs geochronologies, respectively. Mercury concentrations and organic matter ratios in the surface layers are greater than in the older sediments, supporting the hypothesis of anthropogenic enrichment. Results show that the Hg flux has raised more than twofold during the second half of the 20th century. These results point to the need for further studies to substantiate the hypothesis of anthropogenic enrichment and to quantify point sources of Hg to this estuary.
Blue carbon oxidation revealed by radiogenic and stable isotopes in a mangrove system
Publisher: American Geophysical Union (AGU)
Date: 27-05-2017
DOI: 10.1002/2017GL073753
Contrasting organic matter composition in pristine and eutrophicated mangroves revealed by fatty acids and stable isotopes (Rio de Janeiro, Brazil)
Publisher: Elsevier BV
Date: 10-2022
Copper isotopes as a tool to trace contamination in mangroves from an urbanized watershed
Publisher: Elsevier BV
Date: 2024
Carbon and nutrient accumulation in mangrove sediments affected by multiple environmental changes
Publisher: Springer Science and Business Media LLC
Date: 31-03-2020
Radium mass balance and submarine groundwater discharge in Sepetiba Bay, Rio de Janeiro State, Brazil
Publisher: Elsevier BV
Date: 11-2012
Distribution of trace metals in stream sediments along the Trans-Amazonian Federal Highway, Pará State, Brazil
Publisher: Elsevier BV
Date: 10-2014
Synthesis of magnesite at low temperature
Publisher: Springer Science and Business Media LLC
Date: 10-2011
Large aquatic nitrous oxide emissions downstream of intensive horticulture driven by rain events
Publisher: Elsevier BV
Date: 05-2021
Radium-derived porewater exchange and dissolved N and P fluxes in mangroves
Publisher: Elsevier BV
Date: 03-2017
Pyritization of trace metals in mangrove sediments
Publisher: Springer Science and Business Media LLC
Date: 07-03-2012
Mangrove sediments reveal records of development during the previous century (Coffs Creek estuary, Australia)
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.MARPOLBUL.2017.05.052
Abstract: A mangrove sediment core was studied to evaluate possible pollution of an urban estuary in Coffs Harbour, Australia. The heavy metal and nutrient profiles revealed a ~2.5-fold enrichment in more recent sediments. Lead-210 dating showed increasing phosphorous (P) and copper (Cu) accumulation following agricultural activity and population growth in the catchment after 1950. In contrast, nitrogen (N) did not show enrichment suggesting no external sources. Mercury (Hg) depositional fluxes and recent enrichment may be associated to an increase in fossil fuel emissions in the region. Down-core lead (Pb) profiles reflect an increase in leaded gasoline in the 1950s, then a decrease as a result of phasing out leaded gasoline in 1986. The heavy metal and nutrient depositional fluxes are well preserved in mangrove sediments and were related to historical events in the catchment.
Organic carbon accumulation in Brazilian mangal sediments
Publisher: Elsevier BV
Date: 12-2010
Recent Sediment Accumulation in a Mangrove Forest and Its Relevance to Local Sea-Level Rise (Ilha Grande, Brazil)
Publisher: Coastal Education and Research Foundation
Date: 03-2008
DOI: 10.2112/07-0872.1
Australian vegetated coastal ecosystems as global hotspots for climate change mitigation
Publisher: Springer Science and Business Media LLC
Date: 02-10-2019
DOI: 10.1038/S41467-019-12176-8
Abstract: Policies aiming to preserve vegetated coastal ecosystems (VCE tidal marshes, mangroves and seagrasses) to mitigate greenhouse gas emissions require national assessments of blue carbon resources. Here, we present organic carbon (C) storage in VCE across Australian climate regions and estimate potential annual CO 2 emission benefits of VCE conservation and restoration. Australia contributes 5–11% of the C stored in VCE globally (70–185 Tg C in aboveground biomass, and 1,055–1,540 Tg C in the upper 1 m of soils). Potential CO 2 emissions from current VCE losses are estimated at 2.1–3.1 Tg CO 2 -e yr -1 , increasing annual CO 2 emissions from land use change in Australia by 12–21%. This assessment, the most comprehensive for any nation to-date, demonstrates the potential of conservation and restoration of VCE to underpin national policy development for reducing greenhouse gas emissions.
Shrimp farming influence on carbon and nutrient accumulation within Peruvian mangroves sediments
Publisher: Elsevier BV
Date: 09-2020
Significant nitrate attenuation in a mangrove-fringed estuary during a flood-chase experiment
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.ENVPOL.2019.06.060
Abstract: Intertidal wetlands can sequester pollutants along estuarine conduits. Here we test the effectiveness of a mangrove-dominated estuary in removing dissolved nitrogen during a rain event. We intensively and simultaneously s led surface water nutrients upstream and downstream of an estuary before, during and after a 63 mm rain event in Coffs Creek (Australia). NO
Lead-210 and Beryllium-7 fallout rates on the southeastern coast of Brazil
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.JENVRAD.2011.07.008
Abstract: Total ²¹⁰Pb and ⁷Be fallout rates were measured on the coastal region of Niteroi, Brazil. The monthly depositional flux of ²¹⁰Pb and ⁷Be varied by a factor of 26, from 1.7 to 43.3 mBq cm⁻² year⁻¹ and ∼27, from 7.5 to 203.5 mBq cm⁻² year⁻¹, respectively. The relatively large oscillations in the depositional flux of ²¹⁰Pb at this study site were likely due to variations in air mass sources, while the ⁷Be fluctuations may be driven by a combination of weather conditions. Local geology could support the periodic high fluxes of ²¹⁰Pb from continental air masses, as shifting oceanic wind sources were affirmed by the uncorrelated ²¹⁰Pb and ⁷Be fallout activities and ⁷Be/²¹⁰Pb ratios. The ²¹⁰Pb atmospheric deposition was found to be in agreement with local sediment inventories, an important consideration in geochemical studies that estimate sedimentation processes.
Nutrient and Trace Metal Fluxes into Estuarine Sediments Linked to Historical and Expanding Agricultural Activity (Hearnes Lake, Australia)
Publisher: Springer Science and Business Media LLC
Date: 21-03-2019
Recent organic carbon accumulation (~100 years) along the Cabo Frio, Brazil upwelling region
Publisher: Elsevier BV
Date: 03-2014
Beyond burial: Lateral exchange is a significant atmospheric carbon sink in mangrove forests
Publisher: The Royal Society
Date: 07-2018
Abstract: The blue carbon paradigm has evolved in recognition of the high carbon storage and sequestration potential of mangrove, saltmarsh and seagrass ecosystems. However, fluxes of the potent greenhouse gases CH 4 and N 2 O, and lateral export of carbon are often overlooked within the blue carbon framework. Here, we show that the export of dissolved inorganic carbon (DIC) and alkalinity is approximately 1.7 times higher than burial as a long-term carbon sink in a subtropical mangrove system. Fluxes of methane offset burial by approximately 6%, while the nitrous oxide sink was approximately 0.5% of burial. Export of dissolved organic carbon and particulate organic carbon to the coastal zone is also significant and combined may account for an atmospheric carbon sink similar to burial. Our results indicate that the export of DIC and alkalinity results in a long-term atmospheric carbon sink and should be incorporated into the blue carbon paradigm when assessing the role of these habitats in sequestering carbon and mitigating climate change.
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Metal Speciation For Complex Studies In Changing Environments
Start Date: 2015
End Date: 2015
Funder: Australian Research Council
View Funded ActivityBeyond Burial: Redefining The Blue Carbon Paradigm
Start Date: 2018
End Date: 2020
Funder: Australian Research Council
View Funded ActivityIncrease Of Soil Carbon Burial In Mangrove Wetlands
Start Date: 2015
End Date: 2017
Funder: Australian Research Council
View Funded ActivityNutrient Groundwater Exports Versus Soil Burial In Mangroves
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityA Multi-institutional Environmental Radioactivity Research Centre
Start Date: 2017
End Date: 2017
Funder: Australian Research Council
View Funded ActivityA Gamma Spectrometry Facility For Cutting Edge Environmental Geochemistry Investigations
Start Date: 2014
End Date: 2014
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE140100083
Start Date: 2014
End Date: 12-2014
Amount: $155,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP150103286
Start Date: 2015
End Date: 12-2017
Amount: $277,187.00
Funder: Australian Research Council
View Funded ActivityDiscovery Early Career Researcher Award - Grant ID: DE160100443
Start Date: 2016
End Date: 12-2018
Amount: $393,434.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP180101285
Start Date: 03-2018
End Date: 03-2022
Amount: $436,936.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100007
Start Date: 2015
End Date: 12-2015
Amount: $170,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE170100219
Start Date: 2017
End Date: 12-2017
Amount: $170,000.00
Funder: Australian Research Council
View Funded Activity