ORCID Profile
0000-0001-9155-6319
Current Organisation
Université McGill
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Publisher: Copernicus GmbH
Date: 19-10-2020
Abstract: Abstract. The MALINA oceanographic c aign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the c aign, an extensive suite of physical, chemical and biological variables was measured across seven shelf–basin transects (south-north) to capture the meridional gradient between the estuary and the open ocean. Key variables such as temperature, absolute salinity, radiance, irradiance, nutrient concentrations, chlorophyll-a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, and carbon stocks and fluxes were routinely measured onboard the Canadian research icebreaker CCGS Amundsen and from a barge in shallow coastal areas or for s ling within broken ice fields. Here, we present the results of a joint effort to tidy and standardize the collected data sets that will facilitate their reuse in further studies of the changing Arctic Ocean. The dataset is available at 0.17882/75345 (Massicotte2020b).
Publisher: American Geophysical Union (AGU)
Date: 30-12-2011
DOI: 10.1029/2011JC007184
Publisher: Wiley
Date: 2011
Publisher: American Geophysical Union (AGU)
Date: 08-11-2022
DOI: 10.1029/2022GL100553
Abstract: The El Niño Southern Oscillation (ENSO) impacts climate variability globally and can influence extreme climate and weather events. We quantify the uncertainty in ENSO's atmospheric teleconnections with extremes using the Twentieth Century Reanalysis, showing that uncertainty estimates vary regionally over the historical period. Uncertainty is found to be greater in regions of lower socioeconomic development. This can be linked to the limited availability of observational data in these regions as well as difficulties constraining tropical climate dynamics in global gridded atmospheric data sets. Poorer locations face greater challenges due to lack of understanding of past variability limiting confidence in regional projections.
Publisher: American Geophysical Union (AGU)
Date: 06-04-2012
DOI: 10.1029/2011JC007346
Publisher: Springer Science and Business Media LLC
Date: 2003
Abstract: The use of a number of species of marine brown algae in the implementation of bioremediation strategies for toxic heavy metals is being considered and evaluated. The biosorption capacity of these algae for heavy metals resides mainly in a group of linear polysaccharides known as alginates that occur as a gel in the algal thallus. The potential for selective metal binding by the biomass of two species of Sargassum was evaluated by 1H-NMR (nuclear magnetic resonance) following a high temperature, alkaline extraction and purification of their alginate polysaccharide. The alkaline extraction protocol applied to Sargassum fluitans and Sargassum siliquosum yielded alginate s les of low viscosity, suitable for direct acquisition of well-resolved spectra. Estimates of both the ratio of beta-D-mannopyranuronosyl (M) and alpha-L-gulopyranuronosyl (G) residues along the polymer chain and the frequencies of occurrence of diad uronic acid residue pairs were obtained. Guluronic acid (G) was the major component in all extracts and the GG diads accounted for more than 49% of the polymer diads. Whereas the performance of Sargassum spp. in the metal biosorption process is a function of both its alginate content and composition, the occurrence of "G-blocks" in both purified alginates and in the raw brown seaweed is critical because it results in a well-established selectivity for alent ions, potentially increasing the commercial effectiveness of targeted biosorption as a means of remediation.
Publisher: Copernicus GmbH
Date: 15-04-2021
DOI: 10.5194/ESSD-13-1561-2021
Abstract: Abstract. The MALINA oceanographic c aign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the c aign, an extensive suite of physical, chemical and biological variables were measured across seven shelf–basin transects (south–north) to capture the meridional gradient between the estuary and the open ocean. Key variables such as temperature, absolute salinity, radiance, irradiance, nutrient concentrations, chlorophyll a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, and carbon stocks and fluxes were routinely measured onboard the Canadian research icebreaker CCGS Amundsen and from a barge in shallow coastal areas or for s ling within broken ice fields. Here, we present the results of a joint effort to compile and standardize the collected data sets that will facilitate their reuse in further studies of the changing Arctic Ocean. The data set is available at 0.17882/75345 (Massicotte et al., 2020).
Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-11-2022
Abstract: The global carbon cycle is strongly modulated by organic carbon (OC) sequestration and decomposition. Whereas OC sequestration is relatively well constrained, there are few quantitative estimates of its susceptibility to decomposition. Fjords are hot spots of sedimentation and OC sequestration in marine sediments. Here, we adopt fjords as model systems to investigate the reactivity of sedimentary OC by assessing the distribution of the activation energy required to break OC bonds. Our results reveal that OC in fjord sediments is more thermally labile than that in global sediments, which is governed by its unique provenance and organo-mineral interactions. We estimate that 61 ± 16% of the sedimentary OC in fjords is degradable. Once this OC is remobilized and remineralized during glacial maxima, the resulting metabolic CO 2 could counterbalance up to 50 ppm of the atmospheric CO 2 decrease during glacial times, making fjords critical actors in d ening glacial-interglacial climate fluctuations through negative carbon cycling loops.
Publisher: American Geophysical Union (AGU)
Date: 08-12-2011
DOI: 10.1029/2011JC007120
Publisher: Proceedings of the National Academy of Sciences
Date: 29-10-2018
Abstract: The geological record contains numerous ex les of “greenhouse periods” and ocean acidification episodes, where the spreading of corrosive (CO 2 -enriched) bottom waters enhances the dissolution of CaCO 3 minerals delivered to the seafloor or contained within deep-sea sediments. The dissolution of sedimentary CaCO 3 neutralizes excess CO 2 , thus preventing runaway acidification, and acts as a negative-feedback mechanism in regulating atmospheric CO 2 levels over timescales of centuries to millennia. We report an observation-based indication and quantification of significant CaCO 3 dissolution at the seafloor caused by man-made CO 2 . This dissolution is already occurring at various locations in the deep ocean, particularly in the northern Atlantic and near the Southern Ocean, where the bottom waters are young and rich in anthropogenic CO 2 .
No related grants have been discovered for Alfonso Mucci.