A5046194724- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Oceanographic and Atmospheric Processes
- Cryospheric studies and observations
- Heavy metals in environment
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Geochemistry and Elemental Analysis
- Nuclear Physics and Applications
- Microbial Community Ecology and Physiology
- Analytical chemistry methods development
- Polar Research and Ecology
- Isotope Analysis in Ecology
- Air Quality Monitoring and Forecasting
- Atmospheric chemistry and aerosols
- Marine Bivalve and Aquaculture Studies
- Marine and environmental studies
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Spaceflight effects on biology
- Chromium effects and bioremediation
Antarctic Climate and Ecosystems Cooperative Research Centre
2015-2024
University of Tasmania
2015-2024
Australian Antarctic Division
2010-2023
Centenary Institute
2019-2020
GEOMAR Helmholtz Centre for Ocean Research Kiel
2018
Institute for Marine and Antarctic Studies
2010
Abstract Iron is the limiting micronutrient in Southern Ocean and experiments have demonstrated that addition of soluble iron to surface waters results phytoplankton blooms, particularly by large diatoms. Antarctic krill ( Euphausia superba ) eat diatoms recycle when feeding. Baleen whales krill, and, historically, defecation baleen could been a major mechanism for recycling iron, if whale faeces contain significant quantities iron. We analysed content 27 samples from four species whale....
Results from recent field studies in Antarctic sea ice show no clear differences dissolved iron (dFe) concentrations between pack sampled East Antarctica (2.6–20.5 nmol/L), the Weddell Sea (0.7–36.8 and Bellingshausen (1.1–30.2 nmol/L). Dissolved Fe were also similar land‐fast collected (0.7–4.3 nmol/L) Ross (1.1–6.0 In contrast, we observed a remarkable seasonal drawdown of dFe for all reported studies. Furthermore, large inter‐annual variations depth‐averaged organic matter sector...
Abstract The discovery that melting sea ice can fertilize iron (Fe)-depleted polar waters has recently fostered trace metal research efforts in ice. aim of this review is to summarize and synthesize the current understanding Fe biogeochemistry To do so, we compiled available data on particulate, dissolved, total dissolvable (PFe, DFe TDFe, respectively) from sea-ice studies both regions sub-Arctic northern Hemisphere temperate areas. Data analysis focused a circum-Antarctic dataset derived...
Sea ice core chlorophyll a data are used to describe the seasonal, regional and vertical distribution of algal biomass in Southern Ocean pack ice. The Antarctic Ice Processes Climate – Biology (ASPeCt Bio) circumpolar dataset consists 1300 cores collected during 32 cruises over period 25 years. analyses show that integrated sea peaks early spring late austral summer, which is consistent with theories on light nutrient limitation. results indicate circum‐Antarctic scale, surface, internal...
Abstract. Iron availability in the Southern Ocean controls phytoplankton growth, community composition and uptake of atmospheric CO2 by biological pump. The KEOPS-2 (KErguelen Plateau compared Study 2) "process study", took place around Kerguelen Indian sector Ocean. This is a region naturally fertilised with iron on scale hundreds to thousands square kilometres, producing mosaic spring blooms which show distinct biogeochemical responses fertilisation. paper presents budgets (incorporating...
Abstract The Antarctic continental shelf supports a high level of marine primary productivity and is globally important carbon dioxide (CO 2 ) sink through the photosynthetic fixation CO via biological pump. Sustaining such requires large supply essential micronutrient iron (Fe); however, pathways for Fe delivery to these zones vary spatially temporally. Our study first report previously unquantified source concentrated bioavailable surface waters. We hypothesize that derived from subglacial...
Abstract [1] A time series experiment was conducted in late austral spring (November–December 2009) coastal fast ice, East Antarctica (66°13′07″S, 110°39′02″E). Iron (Fe) measurements were made sea snow, brines, and underlying seawater, together with meteorological, physical, biogeochemical to investigate the processes controlling release of Fe into water column. Warming air temperatures clearly associated decreasing brine volume fractions. Macronutrient profiles revealed very low (<1 μM)...
Abstract Although the supply of iron generally limits phytoplankton productivity in Southern Ocean, substantial seasonal blooms are observed over and downstream Kerguelen plateau Indian sector Ocean. Surprisingly, oceanic blooms, those associated with deeper southern last much longer (~3 months) than northern bloom (~1‐month plateau). In this study, mechanisms around were investigated, obtaining profiles dissolved (<0.2 μm, dFe) to 2,000‐m deep at 25 stations during austral summer 2016....
Abstract. This study examined upper-ocean particulate organic carbon (POC) export using the 234Th approach as part of second KErguelen Ocean and Plateau compared Study expedition (KEOPS2). Our aim was to characterize spatial temporal variability POC during austral spring (October–November 2011) in Fe-fertilized area Kerguelen region. fluxes were estimated at high productivity sites over downstream plateau a high-nutrient low-chlorophyll (HNLC) upstream order assess impact iron-induced on...
Abstract. The KEOPS2 project aims to elucidate the role of natural Fe fertilisation on biogeochemical cycles and ecosystem functioning, including quantifying sources processes by which iron is delivered in vicinity Kerguelen Archipelago, Southern Ocean. process study used an upstream high-nutrient, low-chlorophyll (HNLC), deep water (2500 m), reference station compare with a shallow (500 strongly fertilised plateau continued observations downstream, bathymetrically trapped recirculation...
Iron (Fe) is an essential micronutrient that controls phytoplankton growth in the Southern Ocean. Dissolved Fe ( 0.4µm) far more abundant and may also become bioavailable through biogeochemical processing. To assess natural fertilisation from particulate fraction, we surveyed suspended particles water column at 11 stations vicinity of Heard McDonald Islands (HIMI), Indian sector Ocean compared these to downstream plateau reference stations. We quantified labile (potentially bioavailable)...
Abstract Manganese (Mn) is an abundant element in the Earth's crust. However, its concentrations open ocean seawater are low, where external inputs scarce. In this study, we report dissolved Mn and particulate distributions Southern Ocean, measured along GEOTRACES—SR3 transect, from Tasmania (Australia) to Antarctica during austral summer 2018. Both were generally low away localized sources (< 0.3 nmol L −1 < 0.1 , respectively) transect. Our observations of a lower labile fraction...
Our study quantified the spatial and temporal distribution of Fe ancillary biogeochemical parameters at six stations visited during an interdisciplinary Australian Antarctic marine science voyage (SIPEX-2) within East first-year pack ice zone September–October 2012. Unlike previous studies in area, sea Chlorophyll a, Particulate Organic Carbon Nitrogen (POC PON) maxima did not occur ice/water interface because snow loading dynamic processes under which formed. Iron ranged from 0.9 to 17.4 nM...
A simplified, automated, low cost, portable, off-line extraction method with high throughput for trace metal analysis in seawater by SF-ICP-MS.