Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt
Antarctic sea ice can incorporate high levels of iron (Fe) during its formation and has been suggested as an important source of this essential micronutrient to Southern Ocean surface waters during the melt season. Over the last decade, a limited number of studies have quantified the Fe pool in Anta...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://doi.org/10.1029/2020JC016130 http://ecite.utas.edu.au/142657 |
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ftunivtasecite:oai:ecite.utas.edu.au:142657 2023-05-15T13:42:40+02:00 Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt Duprat, L Corkill, M Genovese, C Townsend, AT Moreau, S Meiners, KM Lannuzel, D 2020 application/pdf https://doi.org/10.1029/2020JC016130 http://ecite.utas.edu.au/142657 en eng Wiley-Blackwell Publishing Inc. http://ecite.utas.edu.au/142657/1/142657 - Nutrient distribution in East Antarctic summer sea ice.pdf http://dx.doi.org/10.1029/2020JC016130 Duprat, L and Corkill, M and Genovese, C and Townsend, AT and Moreau, S and Meiners, KM and Lannuzel, D, Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt, JGR Oceans, 125, (12) Article e2020JC016130. ISSN 2169-9275 (2020) [Refereed Article] http://ecite.utas.edu.au/142657 Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1029/2020JC016130 2022-08-29T22:18:13Z Antarctic sea ice can incorporate high levels of iron (Fe) during its formation and has been suggested as an important source of this essential micronutrient to Southern Ocean surface waters during the melt season. Over the last decade, a limited number of studies have quantified the Fe pool in Antarctic sea ice, with a focus on late winter and spring. Here we study the distribution of operationally defined dissolved and particulate Fe from nine sites sampled between Wilkes Land and King George V Land during austral summer 2016/2017. Results point toward a net heterotrophic sea‐ice community, consistent with the observed nitrate limitation (<1μM). We postulate that the recycling of the high particulate Fe pool in summer sea ice supplies sufficient (∼3nM) levels of dissolved Fe to sustain ice algal growth. The remineralization of particulate Fe is likely favored by high concentrations of exopolysaccharides (11316,290μg xeq L −1 ) which can serve as a hotspot for bacterial activity. Finally, results indicate a potential relationship between glacial meltwater discharged from the Moscow University Ice Shelf and the occurrence of Fe‐rich (∼4.3μM) platelet ice in its vicinity. As climate change is expected to result in enhanced Fe‐rich glacial discharge and changes in summer sea‐ice extent and quality, the processes influencing Fe distribution in sea ice that persists into summer need to be better constrained. Article in Journal/Newspaper Antarc* Antarctic George V Land Ice Shelf Moscow University Ice Shelf Sea ice Southern Ocean Wilkes Land eCite UTAS (University of Tasmania) Antarctic Southern Ocean Austral Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) Moscow University Ice Shelf ENVELOPE(121.000,121.000,-67.000,-67.000) Journal of Geophysical Research: Oceans 125 12 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Duprat, L Corkill, M Genovese, C Townsend, AT Moreau, S Meiners, KM Lannuzel, D Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
topic_facet |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
description |
Antarctic sea ice can incorporate high levels of iron (Fe) during its formation and has been suggested as an important source of this essential micronutrient to Southern Ocean surface waters during the melt season. Over the last decade, a limited number of studies have quantified the Fe pool in Antarctic sea ice, with a focus on late winter and spring. Here we study the distribution of operationally defined dissolved and particulate Fe from nine sites sampled between Wilkes Land and King George V Land during austral summer 2016/2017. Results point toward a net heterotrophic sea‐ice community, consistent with the observed nitrate limitation (<1μM). We postulate that the recycling of the high particulate Fe pool in summer sea ice supplies sufficient (∼3nM) levels of dissolved Fe to sustain ice algal growth. The remineralization of particulate Fe is likely favored by high concentrations of exopolysaccharides (11316,290μg xeq L −1 ) which can serve as a hotspot for bacterial activity. Finally, results indicate a potential relationship between glacial meltwater discharged from the Moscow University Ice Shelf and the occurrence of Fe‐rich (∼4.3μM) platelet ice in its vicinity. As climate change is expected to result in enhanced Fe‐rich glacial discharge and changes in summer sea‐ice extent and quality, the processes influencing Fe distribution in sea ice that persists into summer need to be better constrained. |
format |
Article in Journal/Newspaper |
author |
Duprat, L Corkill, M Genovese, C Townsend, AT Moreau, S Meiners, KM Lannuzel, D |
author_facet |
Duprat, L Corkill, M Genovese, C Townsend, AT Moreau, S Meiners, KM Lannuzel, D |
author_sort |
Duprat, L |
title |
Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
title_short |
Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
title_full |
Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
title_fullStr |
Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
title_full_unstemmed |
Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt |
title_sort |
nutrient distribution in east antarctic summer sea ice: a potential iron contribution from glacial basal melt |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020JC016130 http://ecite.utas.edu.au/142657 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(148.000,148.000,-68.500,-68.500) ENVELOPE(121.000,121.000,-67.000,-67.000) |
geographic |
Antarctic Southern Ocean Austral Wilkes Land George V Land Moscow University Ice Shelf |
geographic_facet |
Antarctic Southern Ocean Austral Wilkes Land George V Land Moscow University Ice Shelf |
genre |
Antarc* Antarctic George V Land Ice Shelf Moscow University Ice Shelf Sea ice Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctic George V Land Ice Shelf Moscow University Ice Shelf Sea ice Southern Ocean Wilkes Land |
op_relation |
http://ecite.utas.edu.au/142657/1/142657 - Nutrient distribution in East Antarctic summer sea ice.pdf http://dx.doi.org/10.1029/2020JC016130 Duprat, L and Corkill, M and Genovese, C and Townsend, AT and Moreau, S and Meiners, KM and Lannuzel, D, Nutrient distribution in East Antarctic summer sea ice: a potential iron contribution from glacial basal melt, JGR Oceans, 125, (12) Article e2020JC016130. ISSN 2169-9275 (2020) [Refereed Article] http://ecite.utas.edu.au/142657 |
op_doi |
https://doi.org/10.1029/2020JC016130 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
12 |
_version_ |
1766171193624231936 |