ORCID Profile
0000-0003-0447-795X
Current Organisations
TIG Environmental
,
University of Tasmania
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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)
Physical Oceanography | Climate Change Processes | Ecological Impacts of Climate Change | Atmospheric Dynamics | Atmospheric Sciences | Meteorology | Oceanography
ANZSRC Socio-Economic Objective (SEO)
Climate Variability (excl. Social Impacts) | Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts) | Antarctic and Sub-Antarctic Oceanography | Atmospheric Processes and Dynamics | Climate Change Models |
Related Links
Publications
The Future of the Arctic: What Does It Mean for Sea Ice and Small Creatures?
Publisher: Frontiers Media SA
Date: 28-10-2020
Abstract: The warming of our planet is changing the Arctic dramatically. The area covered by sea-ice is shrinking and the ice that is left is younger and thinner. We took part in an expedition to the Arctic, to study how these changes affect organisms living in and under the ice. Following this expedition, we found that storms can more easily break the thinner ice. Storms form cracks in the sea ice, allowing sunlight to pass into the water below, which makes algal growth possible. Algae are microscopic “plants” that grow in water or sea ice. Storms also brought thick heavy snow, which pushed the ice surface below the water. This flooded the snow and created slush. We discovered that this slush is another good habitat for algae. If Arctic sea ice continues to thin, and storms become more common, we expect that these algal habitats will become more important in the future.
Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard
Publisher: American Geophysical Union (AGU)
Date: 08-2020
DOI: 10.1029/2019JC015662
Ocean‐Sea Ice Processes and Their Role in Multi‐Month Predictability of Antarctic Sea Ice
Publisher: American Geophysical Union (AGU)
Date: 25-04-2022
DOI: 10.1029/2021GL097047
Abstract: Antarctic sea ice is a critical component of the climate system and a vital habitat for Southern Ocean ecosystems. Understanding the underlying physical processes and improving Antarctic sea ice prediction is of broad interest. Using the model data, we investigate sea ice and upper ocean predictability at interannual timescales in the Weddell Sea region. We find that oceanic predictability is largely confined to the Winter Water layer and responds to seasonal modifications of the water column, mainly driven by sea ice processes. Predictability depends not only on the depth of the Winter Water layer, but also on how strongly stratified its base is. Predictability is lost when warm Circumpolar Deep Water with no sea ice‐related memory entrains into the mixed layer. We show the strong dependence of sea ice predictability on the local upper ocean vertical structure, which suggests that both are likely to change in a warming climate.
Connecting to the oceans: supporting ocean literacy and public engagement
Publisher: Springer Science and Business Media LLC
Date: 10-02-2021
Warming world, changing ocean: mitigation and adaptation to support resilient marine systems
Publisher: Springer Science and Business Media LLC
Date: 21-09-2022
The seeding of ice algal blooms in Arctic pack ice: The multiyear ice seed repository hypothesis
Publisher: American Geophysical Union (AGU)
Date: 07-2017
DOI: 10.1002/2016JG003668
Spatiotemporal Variability of Barium in Arctic Sea‐Ice and Seawater
Publisher: American Geophysical Union (AGU)
Date: 05-2018
DOI: 10.1029/2017JC013668
Antarctic Circumpolar Current impacts on internal wave life cycles
Publisher: Wiley
Date: 17-02-2021
Atlantic Water Circulation and Properties Northwest of Svalbard During Anomalous Southerly Winds
Publisher: American Geophysical Union (AGU)
Date: 06-2022
DOI: 10.1029/2021JC018357
Abstract: Atlantic Water (AW), the main source of heat and salt for the Arctic Ocean, undergoes large transformations (cooling and freshening) north of Svalbard as it flows near the surface above the Yermak Plateau (YP). In September 2017, a SeaExplorer ocean glider deployed in the West Spitsbergen Current (WSC) and recovered north of Svalbard documented the circulation and properties of the AW crossing the YP. The glider s led the different branches of the AW flowing into the Arctic around the YP: the WSC, the Svalbard Branch (SB), the Yermak Pass Branch, and the Yermak Branch. Unusual southerly winds prevailed in summer 2017 impacting AW circulation in the region. Cold and fresh lenses of shelf‐origin waters detached from the slope in the WSC to reach their density level below the core of the AW. This resulted in cooling and freshening of the AW inflow from below. The eastward current associated with the SB was found to be weak at its usual location above the 400 m isobath, likely the result of the adjustment of the flow influenced by anomalous southerly wind conditions.
Ocean-sea ice processes and their role on multi-month predictability of Antarctic sea ice
Publisher: Wiley
Date: 12-2021
Defining Southern Ocean fronts and their influence on biological and physical processes in a changing climate
Publisher: Springer Science and Business Media LLC
Date: 24-02-2020
Mixing rates and vertical heat fluxes north of S valbard from A rctic winter to spring
Publisher: American Geophysical Union (AGU)
Date: 06-2017
DOI: 10.1002/2016JC012441
Retroflection of part of the east Greenland current at Cape Farewell
Publisher: American Geophysical Union (AGU)
Date: 04-2007
DOI: 10.1029/2006GL029085
Atlantic waters inflow north of Svalbard: Insights from IAOOS observations and Mercator Ocean global operational system during N-ICE2015
Publisher: American Geophysical Union (AGU)
Date: 02-2017
DOI: 10.1002/2016JC012424
Mixing Variability in the Southern Ocean
Publisher: American Meteorological Society
Date: 04-2015
Abstract: A key remaining challenge in oceanography is the understanding and parameterization of small-scale mixing. Evidence suggests that topographic features play a significant role in enhancing mixing in the Southern Ocean. This study uses 914 high-resolution hydrographic profiles from novel EM-APEX profiling floats to investigate turbulent mixing north of the Kerguelen Plateau, a major topographic feature in the Southern Ocean. A shear–strain finescale parameterization is applied to estimate diapycnal diffusivity in the upper 1600 m of the ocean. The indirect estimates of mixing match direct microstructure profiler observations made simultaneously. It is found that mixing intensities have strong spatial and temporal variability, ranging from O (10 −6 ) to O (10 −3 ) m 2 s −1 . This study identifies topographic roughness, current speed, and wind speed as the main factors controlling mixing intensity. Additionally, the authors find strong regional variability in mixing dynamics and enhanced mixing in the Antarctic Circumpolar Current frontal region. This enhanced mixing is attributed to dissipating internal waves generated by the interaction of the Antarctic Circumpolar Current and the topography of the Kerguelen Plateau. Extending the mixing observations from the Kerguelen region to the entire Southern Ocean, this study infers a large water mass transformation rate of 17 Sverdrups (Sv 1 Sv ≡ 10 6 m 3 s −1 ) across the boundary of Antarctic Intermediate Water and Upper Circumpolar Deep Water in the Antarctic Circumpolar Current. This work suggests that the contribution of mixing to the Southern Ocean overturning circulation budget is particularly significant in fronts.
Genome of the red alga Porphyridium purpureum
Publisher: Springer Science and Business Media LLC
Date: 17-06-2013
DOI: 10.1038/NCOMMS2931
Characteristics and Trends of the Campbell Plateau Meander in the Southern Ocean: 1993-2020
Publisher: Authorea, Inc.
Date: 16-04-2023
DOI: 10.22541/ESSOAR.168167195.52432016/V1
Abstract: Meanders are significant features of the Antarctic Circumpolar Current in the Southern Ocean and sites of enhanced upwelling, cross-frontal tracer fluxes, and exchanges between the surface and deep ocean. They usually overlap the locations of fronts and are linked to topographic features. While much is known about Southern Ocean fronts and how they are changing, the response of meanders to climate change is largely unexplored. In this study, we investigate the C bell Plateau meander south of New Zealand. We apply a local gradient maxima method to satellite altimetry data to identify the position of the meander and estimate its width, geostrophic current speed and associated trends over the 1993-2020 period. We find that the position of the meander has been relatively fixed, except for the section downstream from the Plateau, which has shifted northward by about 0.4° latitude per decade. The meander has become flatter at the Plateau’s western edge, but steeper at the eastern edge of the Plateau. Overall, the meander has been widening by 2 km per decade and accelerating by 0.01 m s-1 per decade, particularly downstream from the Plateau. These findings are consistent with other work on standing meanders and observed changes in the Southern Ocean. While we cannot attribute the observed trends of the C bell Plateau meander to one particular forcing mechanism, we discuss several hypotheses in the context of existing literature. Whether these trends are similar for other Southern Ocean meanders and their implications remains to be verified.
Cooling and Freshening of the West Spitsbergen Current by Shelf‐Origin Cold Core Lenses
Publisher: American Geophysical Union (AGU)
Date: 11-2018
DOI: 10.1029/2018JC014463
Algal Hot Spots in a Changing Arctic Ocean: Sea-Ice Ridges and the Snow-Ice Interface
Publisher: Frontiers Media SA
Date: 12-03-2018
Antarctic Circumpolar Current Impacts on Internal Wave Life Cycles
Publisher: American Geophysical Union (AGU)
Date: 23-04-2021
DOI: 10.1029/2020GL089471
Abstract: Major gaps exist in our understanding of the pathways between internal wave generation and breaking in the Southern Ocean, with important implications for the distribution of internal wave‐driven mixing, the sensitivity of ocean mixing rates and patterns to changes in the ocean environment, and the necessary ingredients of mixing parameterizations. Here we assess the dominant processes in internal wave evolution by characterizing wave and mesoscale flow scales based on full‐depth in situ measurements in a Southern Ocean mixing hot spot and a ray tracing calculation. The exercise highlights the importance of Antarctic Circumpolar Current jets as a dominant influence on internal wave life cycles through advection, the modification of wave characteristics via wave‐mean flow interactions, and the set‐up of critical layers for both upward‐ and downward‐propagating waves. Our findings suggest that it is important to represent mesoscale flow impacts in parameterizations of internal wave‐driven mixing in the Southern Ocean.
Internal Waves and Mixing near the Kerguelen Plateau
Publisher: American Meteorological Society
Date: 02-2016
Abstract: In the stratified ocean, turbulent mixing is primarily attributed to the breaking of internal waves. As such, internal waves provide a link between large-scale forcing and small-scale mixing. The internal wave field north of the Kerguelen Plateau is characterized using 914 high-resolution hydrographic profiles from novel Electromagnetic Autonomous Profiling Explorer (EM-APEX) floats. Altogether, 46 coherent features are identified in the EM-APEX velocity profiles and interpreted in terms of internal wave kinematics. The large number of internal waves analyzed provides a quantitative framework for characterizing spatial variations in the internal wave field and for resolving generation versus propagation dynamics. Internal waves observed near the Kerguelen Plateau have a mean vertical wavelength of 200 m, a mean horizontal wavelength of 15 km, a mean period of 16 h, and a mean horizontal group velocity of 3 cm s −1 . The internal wave characteristics are dependent on regional dynamics, suggesting that different generation mechanisms of internal waves dominate in different dynamical zones. The wave fields in the Subantarctic/Subtropical Front and the Polar Front Zone are influenced by the local small-scale topography and flow strength. The eddy-wave field is influenced by the large-scale flow structure, while the internal wave field in the Subantarctic Zone is controlled by atmospheric forcing. More importantly, the local generation of internal waves not only drives large-scale dissipation in the frontal region but also downstream from the plateau. Some internal waves in the frontal region are advected away from the plateau, contributing to mixing and stratification budgets elsewhere.
Nutrients in Water Masses in the Atlantic Sector of the Arctic Ocean: Temporal Trends, Mixing and Links With Primary Production
Publisher: American Geophysical Union (AGU)
Date: 30-07-2021
DOI: 10.1029/2021JC017413
Abstract: There is strong evidence of an increase in primary production (PP) in the Arctic Ocean (AO) over the last two decades. Further increases will depend on the interplay between decreasing light limitation for primary producers, as the sea ice extent and thickness decrease, and the availability of nutrients, which is controlled by, but not limited to, inputs from the Atlantic and the Pacific Oceans. While these inputs are the major nutrient sources to the AO, ocean vertical mixing is required to bring the nutrients into the photic zone. We analyze data collected in the Western Eurasian Basin (WEB) between 1980 and 2016 and characterize the nutrient climatology of the various water masses. We conclude that there were no significant trends in the concentrations of the two macronutrients that typically limit PP in the AO (nitrate and silicic acid, in the case of diatoms), except a decreasing trend for silicic acid in Polar Surface Water (PSW), which is consistent with the reported increase in PP in the AO. We suggest that the Whalers Bay polynya, located in the northwestern corner of Svalbard, may act as a mixing hotspot, creating patches of nutrient replenished PSW. These patches may then be advected to higher latitudes under the ice pack, later boosting PP upon release from light limitation or else, keeping a nutrient reservoir that may be used in a subsequent growth season. It is likely that this remaining nutrient reservoir will decrease as sea ice cover retreats and light limitation alleviates.
Mixing (MX) Oceanographic Toolbox for EM-APEX* float data applying shear-strain finescale parameterization
Publisher: University of Tasmania
Date: 2014
Does Your Lab Use Social Media?: Sharing Three Years of Experience in Science Communication
Publisher: American Meteorological Society
Date: 06-2018
Abstract: Effective science communication is essential to share knowledge and recruit the next generation of researchers. Science communication to the general public can, however, be h ered by limited resources and a lack of incentives in the academic environment. Various social media platforms have recently emerged, providing free and simple science communication tools to reach the public and young people especially, an audience often missed by more conventional outreach initiatives. While in idual researchers and large institutions are present on social media, smaller research groups are underrepresented. As a small group of oceanographers, sea ice scientists, and atmospheric scientists at the Norwegian Polar Institute, we share our experience establishing, developing, and maintaining a successful Arctic science communication initiative (@oceanseaicenpi) on Instagram, Twitter, and Facebook. The initiative is run entirely by a team of researchers with limited time and financial resources. It has built a broad audience of more than 7,000 followers, half of which is associated with the team’s Instagram account. To our knowledge, @oceanseaicenpi is one of the most successful Earth sciences Instagram accounts managed by researchers. The initiative has boosted the alternative metric scores of our publications and helped participating researchers become better writers and communicators. We hope to inspire and help other research groups by providing some guidelines on how to develop and conduct effective science communication via social media.
Science Outreach Using Social Media: Oceanography from the Lab to the Public
Publisher: The Oceanography Society
Date: 06-2018
Winter to summer oceanographic observations in the A rctic O cean north of S valbard
Publisher: American Geophysical Union (AGU)
Date: 08-2017
DOI: 10.1002/2016JC012391
Winter ocean‐ice interactions under thin sea ice observed by I AOOS platforms during N ‐I CE2015: Salty surface mixed layer and active basal melt
Publisher: American Geophysical Union (AGU)
Date: 10-2016
DOI: 10.1002/2016JC012195
Extreme Climate and Weather Events in a Warmer World
Publisher: Frontiers Media SA
Date: 29-03-2022
Abstract: Extreme climate and weather events are unusual and rare events that often cause a lot of damage both to nature and to people. They take place in the air (storms, tornadoes, heavy rain, atmospheric rivers), in the ocean (storm surges, marine heatwaves), and on the land (wildfires, heatwaves, floods, droughts). Many weather and climate extremes happen naturally, even without climate change. But Earth’s changing climate does change where and how often some extreme events take place, and how strong those events are. What are extreme climate and weather events? Will new or stronger extreme events happen due to climate change? How is climate change impacting extreme events? These are the type of questions that our team of climate and earth scientists from around the world will answer in this article.
Sea ice thermohaline dynamics and biogeochemistry in the Arctic Ocean: Empirical and model results
Publisher: American Geophysical Union (AGU)
Date: 07-2017
DOI: 10.1002/2016JG003660
Winter storms accelerate the demise of sea ice in the Atlantic sector of the Arctic Ocean
Publisher: Springer Science and Business Media LLC
Date: 25-06-2019
DOI: 10.1038/S41598-019-45574-5
Abstract: A large retreat of sea-ice in the ‘stormy’ Atlantic Sector of the Arctic Ocean has become evident through a series of record minima for the winter maximum sea-ice extent since 2015. Results from the Norwegian young sea ICE (N-ICE2015) expedition, a five-month-long (Jan-Jun) drifting ice station in first and second year pack-ice north of Svalbard, showcase how sea-ice in this region is frequently affected by passing winter storms. Here we synthesise the interdisciplinary N-ICE2015 dataset, including independent observations of the atmosphere, snow, sea-ice, ocean, and ecosystem. We build upon recent results and illustrate the different mechanisms through which winter storms impact the coupled Arctic sea-ice system. These short-lived and episodic synoptic-scale events transport pulses of heat and moisture into the Arctic, which temporarily reduce radiative cooling and henceforth ice growth. Cumulative snowfall from each sequential storm deepens the snow pack and insulates the sea-ice, further inhibiting ice growth throughout the remaining winter season. Strong winds fracture the ice cover, enhance ocean-ice-atmosphere heat fluxes, and make the ice more susceptible to lateral melt. In conclusion, the legacy of Arctic winter storms for sea-ice and the ice-associated ecosystem in the Atlantic Sector lasts far beyond their short lifespan.
One‐dimensional evolution of the upper water column in the A tlantic sector of the A rctic O cean in winter
Publisher: American Geophysical Union (AGU)
Date: 03-2017
DOI: 10.1002/2016JC012431
Related Organisations
Pennsylvania State University University Park
Location: United States of America
National Oceanography Center
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
Discovery Early Career Researcher Award - Grant ID: DE200100414
Start Date: 03-2021
End Date: 03-2025
Amount: $415,266.00
Funder: Australian Research Council
View Funded ActivityARC Centres Of Excellence - Grant ID: CE170100023
Start Date: 08-2017
End Date: 12-2024
Amount: $30,050,000.00
Funder: Australian Research Council
View Funded Activity