A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice
Iron (Fe) is an essential micronutrient to oceanic microalgae, and its dissolved fraction (DFe) is retained in surface waters by Fe-binding ligands. Previous work has suggested that ligands may also bind Fe within sea ice, although supporting data are limited. This study investigates distribution, c...
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University of California Press
2022
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Online Access: | http://dx.doi.org/10.1525/elementa.2021.00030 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00030/773452/elementa.2021.00030.pdf |
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crunicaliforniap:10.1525/elementa.2021.00030 2023-11-12T04:08:15+01:00 A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice Genovese, Cristina Grotti, Marco Ardini, Francisco Corkill, Matthew J. Duprat, Luis P. Wuttig, Kathrin Townsend, Ashley T. Lannuzel, Delphine 2022 http://dx.doi.org/10.1525/elementa.2021.00030 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00030/773452/elementa.2021.00030.pdf en eng University of California Press http://creativecommons.org/licenses/by/4.0/ Elementa: Science of the Anthropocene volume 10, issue 1 ISSN 2325-1026 Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography journal-article 2022 crunicaliforniap https://doi.org/10.1525/elementa.2021.00030 2023-10-15T17:39:37Z Iron (Fe) is an essential micronutrient to oceanic microalgae, and its dissolved fraction (DFe) is retained in surface waters by Fe-binding ligands. Previous work has suggested that ligands may also bind Fe within sea ice, although supporting data are limited. This study investigates distribution, concentration, and potential drivers of Fe-binding ligands in Antarctic sea ice, considering the ice type, location and season. Results suggest that the concentration of ligands (CL) varies throughout the year, both spatially and seasonally. The lowest CL (3.3–8.0 nM) and DFe concentrations (0.7–3.5 nM) were recorded in newly formed winter sea ice in the Weddell Sea, likely due to the early stage of sea-ice growth and low biological activity. The highest CL (1.7–74.6 nM), which follows the distribution of DFe (1.0–75.5 nM), was observed during springtime, in the Eastern Antarctic Sector. There, consistently higher values for CL in bottom ice depths were likely associated with enhanced algal biomass, while aeolian deposition may have acted as an additional source of DFe and ligands near Davis station. In summer, the senescence of ice algae and advanced sea-ice melting led to intermediate CL (1.0–21.9 nM) and DFe concentrations (0.6–13.3 nM) both on and off the East Antarctic coast. Regardless of time and location, >99% of DFe was complexed, suggesting that CL controls the distribution of DFe in sea ice. This study represents a first attempt at a year-round investigation of CL in sea ice, providing results that support the premise that sea ice acts as a potential biogeochemical bridge between autumn and spring phytoplankton blooms. Article in Journal/Newspaper Antarc* Antarctic ice algae Sea ice Weddell Sea University of California Press (via Crossref) Antarctic Weddell Sea Weddell Davis Station ENVELOPE(77.968,77.968,-68.576,-68.576) Davis-Station ENVELOPE(77.968,77.968,-68.576,-68.576) Elementa: Science of the Anthropocene 10 1 |
institution |
Open Polar |
collection |
University of California Press (via Crossref) |
op_collection_id |
crunicaliforniap |
language |
English |
topic |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
spellingShingle |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Genovese, Cristina Grotti, Marco Ardini, Francisco Corkill, Matthew J. Duprat, Luis P. Wuttig, Kathrin Townsend, Ashley T. Lannuzel, Delphine A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
topic_facet |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
description |
Iron (Fe) is an essential micronutrient to oceanic microalgae, and its dissolved fraction (DFe) is retained in surface waters by Fe-binding ligands. Previous work has suggested that ligands may also bind Fe within sea ice, although supporting data are limited. This study investigates distribution, concentration, and potential drivers of Fe-binding ligands in Antarctic sea ice, considering the ice type, location and season. Results suggest that the concentration of ligands (CL) varies throughout the year, both spatially and seasonally. The lowest CL (3.3–8.0 nM) and DFe concentrations (0.7–3.5 nM) were recorded in newly formed winter sea ice in the Weddell Sea, likely due to the early stage of sea-ice growth and low biological activity. The highest CL (1.7–74.6 nM), which follows the distribution of DFe (1.0–75.5 nM), was observed during springtime, in the Eastern Antarctic Sector. There, consistently higher values for CL in bottom ice depths were likely associated with enhanced algal biomass, while aeolian deposition may have acted as an additional source of DFe and ligands near Davis station. In summer, the senescence of ice algae and advanced sea-ice melting led to intermediate CL (1.0–21.9 nM) and DFe concentrations (0.6–13.3 nM) both on and off the East Antarctic coast. Regardless of time and location, >99% of DFe was complexed, suggesting that CL controls the distribution of DFe in sea ice. This study represents a first attempt at a year-round investigation of CL in sea ice, providing results that support the premise that sea ice acts as a potential biogeochemical bridge between autumn and spring phytoplankton blooms. |
format |
Article in Journal/Newspaper |
author |
Genovese, Cristina Grotti, Marco Ardini, Francisco Corkill, Matthew J. Duprat, Luis P. Wuttig, Kathrin Townsend, Ashley T. Lannuzel, Delphine |
author_facet |
Genovese, Cristina Grotti, Marco Ardini, Francisco Corkill, Matthew J. Duprat, Luis P. Wuttig, Kathrin Townsend, Ashley T. Lannuzel, Delphine |
author_sort |
Genovese, Cristina |
title |
A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
title_short |
A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
title_full |
A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
title_fullStr |
A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
title_full_unstemmed |
A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice |
title_sort |
proposed seasonal cycle of dissolved iron-binding ligands in antarctic sea ice |
publisher |
University of California Press |
publishDate |
2022 |
url |
http://dx.doi.org/10.1525/elementa.2021.00030 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00030/773452/elementa.2021.00030.pdf |
long_lat |
ENVELOPE(77.968,77.968,-68.576,-68.576) ENVELOPE(77.968,77.968,-68.576,-68.576) |
geographic |
Antarctic Weddell Sea Weddell Davis Station Davis-Station |
geographic_facet |
Antarctic Weddell Sea Weddell Davis Station Davis-Station |
genre |
Antarc* Antarctic ice algae Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic ice algae Sea ice Weddell Sea |
op_source |
Elementa: Science of the Anthropocene volume 10, issue 1 ISSN 2325-1026 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1525/elementa.2021.00030 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
10 |
container_issue |
1 |
_version_ |
1782328592348217344 |