Article
Oceanography
Po-Chun Hsu, Luca Centurioni, Huan-Jie Shao, Quanan Zheng, Ching-Yuan Lu, Tai-Wen Hsu, Ruo-Shan Tseng
Summary: Research on ocean currents in the southern East China Sea has revealed complex flow structures and seasonal water mass exchange cycles. Data from coastal radars in northern Taiwan, drifters, and satellite observations have provided detailed information on surface currents, resolving disputes over the surface currents in this area.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Mingxian Guo, Peng Xiu, Xiaogang Xing
Summary: This study reveals the complex role of submesoscale dynamics, particularly frontal dynamics, in shaping the distribution of phytoplankton in the South Indian Ocean. Frontal dynamics play a crucial role in injecting nutrients and enhancing phytoplankton growth, especially diatoms.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Dae-Won Kim, So-Hyun Kim, Young-Heon Jo
Summary: Long-term sea surface salinity in the East China Sea was estimated using machine learning based on OC-CCI data. The study revealed the distribution of Changjiang diluted water fronts and their correlation with chlorophyll-a concentration, sea surface density, and nitrogen concentration. The influence of Changjiang diluted water on sea level anomaly was also detected. This research provides valuable insights on the impact of Changjiang diluted water on the East China Sea marine environment.
Article
Oceanography
Ajitha Cyriac, Helen E. Phillips, Nathaniel L. Bindoff, Kurt Polzin
Summary: This study presents novel observational estimates of turbulent dissipation and mixing in a standing meander in the Southern Ocean, indicating significant spatial and temporal variability of turbulent mixing influenced by factors such as the Subantarctic Front and mesoscale eddies.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Environmental Sciences
R. M. Wright, C. Le Quere, N. Mayot, A. Olsen, D. C. E. Bakker
Summary: The Southern Ocean is crucial for carbon uptake, transport, and storage by the global oceans. It is the largest CO2 sink but has low storage of anthropogenic carbon due to the unique combination of upwelling of deep waters and northward transport of surface carbon driven by high winds. Through modeling and observations, we isolate the direct effect of increasing anthropogenic CO2 from the indirect effect of climate variability and change on carbon reorganization in the Southern Ocean. Climate variability and change have a significant impact on carbon storage in the Southern Ocean, comparable to the effect of anthropogenic CO2.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Oceanography
Lixiao Xu, Keyao Wang, Baolan Wu
Summary: Recent evidence suggests that there have been poleward movements of the North Pacific subtropical gyre and the KE/OE fronts in the past few decades. However, changes in the STFs, especially in their eastern part, still need to be quantified. By analyzing various data sources, this study shows that the STFs have weakened and shifted poleward from 1980 to 2018, with the central mode water and subtropical mode water being the most affected.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Ecology
Nicolas Metzl, Claire Lo Monaco, Coraline Leseurre, Celine Ridame, Jonathan Fin, Claude Mignon, Marion Gehlen, Thi Tuyet Trang Chau
Summary: This study describes new sea surface CO2 observations in the south-western Indian Ocean, highlighting a strong bloom event that occurred in January 2020. The observations indicate a biologically driven process and show significant carbon uptake in the region. The paper emphasizes the importance of understanding the origin and impact of these sporadic blooms on ocean carbon uptake.
Article
Oceanography
Yu Gao, Igor Kamenkovich, Natalie Perlin, Benjamin Kirtman
Summary: This study analyzes the role of mesoscale heat advection in a mixed layer heat budget. It shows that oceanic currents create mesoscale anomalies in sea surface temperature through heat advection. The atmospheric turbulent heat fluxes, on the other hand, dampen these temperature anomalies.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Geochemistry & Geophysics
Thomas J. Williams, Amy J. Wagner, Elisabeth L. Sikes, Ellen E. Martin
Summary: The study revealed a decrease in delta C-13(DIC) in the surface ocean of the Southeastern Indian Ocean over the last decade, primarily attributed to the uptake of anthropogenic CO2, with a significant impact observed in the Subantarctic Mode Water (SAMW). The research estimated that the annual storage of anthropogenic carbon in the SAMW of the southeastern Indian Ocean increased significantly between 2008 and 2018 compared to previous years.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Meteorology & Atmospheric Sciences
Morio Nakayama, Hisashi Nakamura, Fumiaki Ogawa
Summary: The study indicates that the midlatitude oceanic frontal zone enhances and anchors the variability of the baroclinic annular mode (BAM) by supplying sensible heat and moisture from the ocean, although the BAM is primarily a manifestation of atmospheric internal dynamics. The BAM modulates momentum flux associated with transient disturbances to induce a modest but robust meridional shift of the polar-front jet, suggesting that it can help maintain the stability of the southern annular mode. The quasi-periodic behavior of the BAM likely reflects the internal dynamics involving atmospheric disturbances on both subweekly and longer time scales.
JOURNAL OF CLIMATE
(2021)
Article
Ecology
Lauren Roman, Farzana Kastury, Sophie Petit, Rina Aleman, Britta Denise Hardesty, Chris Wilcox
Summary: This study investigates the concentration of elements in feathers of highly mobile seabirds in global biodiversity hotspots. The results show that some elements have higher concentrations in smaller species compared to larger ones. Additionally, the element concentrations in feathers vary among different ocean basins.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2023)
Article
Environmental Sciences
Judith Hauck, Luke Gregor, Cara Nissen, Lavinia Patara, Mark Hague, Precious Mongwe, Seth Bushinsky, Scott C. Doney, Nicolas Gruber, Corinne Le Quere, Manfredi Manizza, Matthew Mazloff, Pedro M. S. Monteiro, Jens Terhaar
Summary: Based on data from the RECCAP2 project, we assessed the CO2 uptake in the Southern Ocean and found that it is only half of what was previously estimated. Furthermore, there is a knowledge gap in understanding the increase in CO2 sink since 2000. It is important to improve our observation and understanding of the drivers of the carbon cycle in order to accurately assess the Southern Ocean's role in CO2 absorption.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Oceanography
Prince Prakash, Satya Prakash, M. Ravichandran, N. Anil Kumar, T. V. S. Udaya Bhaskar
Summary: The Southern Ocean plays a critical role in global ocean productivity and carbon cycling. Bio-Argo floats deployed in the Indian sector of the Southern Ocean have provided new insights into biogeochemical processes. The study reveals significantly higher dissolved oxygen levels in certain floats during specific seasons, with cyclonic eddies and high chlorophyll concentrations identified as contributing factors.
JOURNAL OF OCEANOGRAPHY
(2022)
Article
Geosciences, Multidisciplinary
Kazutoshi Sato, Jun Inoue
Summary: Using a combination of observations and analysis methods, this study investigated the relationship between marine bioaerosols and ice cloud formation over the Southern Ocean. The results suggest that bioaerosols emitted from the ocean over the mid-latitudes acted as ice-nucleating particles for ice cloud formation over high-latitudes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Ryan Cloete, Jean C. Loock, Natasha R. van Horsten, Susanne Fietz, Thato N. Mtshali, Helene Planquette, Alakendra N. Roychoudhury
Summary: Winter distributions of dissolved cadmium and particulate cadmium were measured for the first time in the Indian sector of the Southern Ocean, revealing the important role of biological uptake in the biogeochemical cycling of cadmium during winter months, although weaker compared to summer. Distinct, biologically driven changes in cadmium cycling were observed across different latitudinal zones, with surface distributions of cadmium influenced by the preferential uptake and regeneration of diatoms with high cadmium content as well as the upwelling of cadmium-enriched water masses in the Antarctic zone.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geology
Morten Lunde Nielsen, Mirinae Lee, Hong Chin Ng, Jeremy C. Rushton, Katharine R. Hendry, Ji-Hoon Kihm, Arne T. Nielsen, Tae-Yoon S. Park, Jakob Vinther, Philip R. Wilby
Summary: The correct interpretation of soft-bodied fossils relies on a thorough understanding of their taphonomy. This study investigates the mineral replacements in panarthropod fossils from the Sirius Passet Lagerstatte and reveals the potential impacts of deeper burial and metamorphism on fossil preservation. The study provides critical context for interpreting the Sirius Passet biota and identifies late-stage overprints in other biotas.
Correction
Geosciences, Multidisciplinary
Jon R. Hawkings, Benjamin S. Linhoff, Jemma L. Wadham, Marek Stibal, Carl H. Lamborg, Gregory T. Carling, Guillaume Lamarche-Gagnon, Tyler J. Kohler, Rachael Ward, Katharine R. Hendry, Lukas Falteisek, Anne M. Kellerman, Karen A. Cameron, Jade E. Hatton, Sarah Tingey, Amy D. Holt, Petra Vinsova, Stefan Hofer, Marie Bulinova, Tomas Vetrovsky, Lorenz Meire, Robert G. M. Spencer
Article
Geosciences, Multidisciplinary
Jon R. Hawkings, Benjamin S. Linhoff, Jemma L. Wadham, Marek Stibal, Carl H. Lamborg, Gregory T. Carling, Guillaume Lamarche-Gagnon, Tyler J. Kohler, Rachael Ward, Katharine R. Hendry, Lukas Falteisek, Anne M. Kellerman, Karen A. Cameron, Jade E. Hatton, Sarah Tingey, Amy D. Holt, Petra Vinsova, Stefan Hofer, Marie Bulinova, Tomas Vetrovsky, Lorenz Meire, Robert G. M. Spencer
Summary: The Greenland Ice Sheet contributes significantly to the global riverine flux of mercury, with extremely high concentrations of dissolved mercury in meltwaters and exports to downstream fjords. The geological source of mercury at the ice sheet bed results in concentrations exceeding those in surface snow and ice. Understanding mercury dynamics in ice sheet runoff is crucial for Arctic ecosystems under global warming.
Article
Engineering, Environmental
Christian Marz, Felipe S. Freitas, Johan C. Faust, Jasmin A. Godbold, Sian F. Henley, Allyson C. Tessin, Geoffrey D. Abbott, Ruth Airs, Sandra Arndt, David K. A. Barnes, Laura J. Grange, Neil D. Gray, Ian M. Head, Katharine R. Hendry, Robert G. Hilton, Adam J. Reed, Saskia Ruhl, Martin Solan, Terri A. Souster, Mark A. Stevenson, Karen Tait, James Ward, Stephen Widdicombe
Summary: The Arctic is undergoing unprecedented and dramatic transformations in response to climate change, with a disproportionate focus on visible aspects like sea ice melt and the fate of megafauna. However, the importance of the shelf seafloor in regulating nutrients and sequestering carbon is often overlooked. Climate change and regional adjustments to human activities may alter the biogeochemical and ecological dynamics of the Arctic shelf seafloor, impacting ecosystem function, carbon burial, and nutrient recycling. Mitigating climatic and anthropogenic change requires recognizing the vital role of the Arctic benthic system.
Article
Geochemistry & Geophysics
James P. J. Ward, Katharine R. Hendry, Sandra Arndt, Johan C. Faust, Felipe S. Freitas, Sian F. Henley, Jeffrey W. Krause, Christian Marz, Hong Chin Ng, Rebecca A. Pickering, Allyson C. Tessin
Summary: The biogeochemical cycling of silicon in the Barents Sea is affected by physical and chemical changes, including warming, sea ice retreat, and decreased dissolved silicic acid concentrations. Changes in phytoplankton community composition will affect the material in the sediment and its recycling at the seafloor.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
F. S. Freitas, S. Arndt, K. R. Hendry, J. C. Faust, A. C. Tessin, C. Marz
Summary: Carbonate chemistry of the Arctic Ocean seafloor and its vulnerability to ocean acidification remain poorly understood. This study employs an integrated data-model assessment to investigate benthic pH and carbonate chemistry in the Barents Sea, revealing the main drivers of carbonate dynamics and estimating benthic fluxes of dissolved inorganic carbon and alkalinity. The findings highlight the importance of organic matter degradation and bottom water conditions in shaping sedimentary carbonate chemistry and have significant implications for predicting carbon burial and pH buffering in the Arctic Ocean in the future.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Editorial Material
Environmental Sciences
Katharine R. Hendry
Article
Environmental Sciences
Holly Wallington, Katharine Hendry, Rupert Perkins, Marian Yallop, Sandra Arndt
Summary: Riverine dissolved silicon (DSi) and biogenic silica (BSi) in estuaries are influenced by various biotic and abiotic processes. The benthic diatom-dominated biofilm system plays a crucial role in controlling silicon transport in alluvial estuaries. The Severn Estuary in the UK was studied to enhance our understanding of silicon transport in benthic-dominated systems. The study found that river and tidal hydrodynamics drove changes in DSi concentrations, and that benthic biofilms on intertidal mudflats contributed to high BSi content in the estuary.
Article
Geochemistry & Geophysics
James Kershaw, Joseph A. Stewart, Ivo Strawson, Maria Luiza de Carvalho Ferreira, Laura F. Robinson, Katharine R. Hendry, Ana Samperiz, Andrea Burke, James W. B. Rae, Rusty D. Day, Peter J. Etnoyer, Branwen Williams, Vreni Haussermann
Summary: Based on the study of modern Stylasteridae corals, it is found that [Ba]SW and sample mineralogy are the main factors influencing coral Ba/Ca ratios, while seawater temperature has a weak influence. Paired Sr/Ca measurements suggest that the variability in scleractinian Ba/Ca may be related to varying degrees of Rayleigh fractionation during calcification. Stylasteridae corals have the potential to be an important new archive for paleoceanographic studies.
Article
Environmental Sciences
Johan C. Faust, Philippa Ascough, Robert G. Hilton, Mark A. Stevenson, Katharine R. Hendry, Christian Maerz
Summary: The association of organic carbon with iron minerals (Fe-R) is crucial for its long-term storage and burial efficiency in marine sediments. However, uncertainties exist regarding the sources, age, lability, and composition of this organic matter. This study uses radiocarbon and stable isotopes to investigate the source and age of Fe-R-associated organic carbon in Arctic marine sediments. The results suggest that fresh and marine organic matter rapidly binds with Fe-R, protecting and stabilizing labile organic matter and highlighting the potential of the organic carbon-iron association as an efficient carbon burial mechanism.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Hong Chin Ng, Jon R. Hawkings, Sebastien Bertrand, Brent A. Summers, Matthias Sieber, Tim M. Conway, Felipe S. Freitas, James P. J. Ward, Helena V. Pryer, Jemma L. Wadham, Sandra Arndt, Katharine R. Hendry
Summary: Glacier meltwater provides silicon and iron to downstream ecosystems, but their transportation to the ocean is regulated by benthic cycling within fjord systems. The study found that higher fluxes of dissolved iron and relatively lower fluxes of dissolved silicon in glacial fjord heads result from different reasons and have different implications compared to other areas.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Correction
Chemistry, Medicinal
Catherine R. Back, Henry L. Stennett, Sam E. Williams, Luoyi Wang, Jorge Ojeda Gomez, Omar M. Abdulle, Thomas Duffy, Christopher Neal, Judith Mantell, Mark A. Jepson, Katharine R. Hendry, David Powell, James E. M. Stach, Angela E. Essex-Lopresti, Christine L. Willis, Paul Curnow, Paul R. Race
Article
Environmental Sciences
J. E. Hatton, H. C. Ng, L. Meire, E. M. S. Woodward, M. J. Leng, C. D. Coath, A. Stuart-Lee, T. Wang, A. L. Annett, K. R. Hendry
Summary: Glaciers and ice sheets are rapidly warming due to climate change, and research suggests that glacial meltwaters provide important nutrients to downstream ecosystems. However, the fate of these nutrients in fjord environments is still uncertain. A study in southwest Greenland used concentration data and isotopic compositions to investigate silicon cycling in two contrasting fjords. The results suggest that glacially derived amorphous silica may play a role in modifying coastal waters within fjords.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Michael J. Whitehouse, Katharine R. Hendry, Geraint A. Tarling, Sally E. Thorpe, Petra Ten Hoopen
Summary: We have created a database of macronutrient data obtained from 20 oceanographic cruises conducted primarily around South Georgia and the Scotia Sea. The database includes measurements of nutrients such as silicate, phosphate, nitrate, ammonium, and nitrite, along with temperature and salinity data. This comprehensive dataset provides valuable information for studying the ecology of the Southern Ocean and its surrounding regions.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Ecology
James P. J. Ward, Katharine R. Hendry, Sandra Arndt, Johan C. Faust, Felipe S. Freitas, Sian F. Henley, Jeffrey W. Krause, Christian Marz, Allyson C. Tessin, Ruth L. Airs
Summary: The Barents Sea has experienced rapid changes in water column warming and sea ice loss, leading to ecosystem adjustments and changes in phytoplankton species composition. The composition of phytodetritus at the seafloor, which plays a crucial role in nutrient recycling, may also be affected. Through modeling and observational data, researchers have identified the reaction pathways and important processes involved in the cycling of silicon within the seafloor. These findings have implications for understanding the benthic-pelagic coupling in the Barents Sea and the regional ocean silicon budget.
