Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing
Upward advection or mixing of iron-rich deep waters due to circulation changes driven by the rate of basal ice shelf melt was shown to be a primary control on chlorophyll a production in coastal polynyas over the Antarctic continental shelf. Here, the effects of atmospheric changes projected in 2100...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
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2023
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Online Access: | https://digitalcommons.odu.edu/ccpo_pubs/378 https://doi.org/10.1029/2022JC019210 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1382/viewcontent/Dinniman_2023_SensitivityoftheRelationshipBetweenAntarcticOCR.pdf |
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ftolddominionuni:oai:digitalcommons.odu.edu:ccpo_pubs-1382 2023-12-17T10:20:40+01:00 Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing Dinniman, Michael S. St-Laurent, Pierre Arrigo, Kevin R. Hofmann, Eileen E. van Dijken, Gert L. 2023-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/ccpo_pubs/378 https://doi.org/10.1029/2022JC019210 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1382/viewcontent/Dinniman_2023_SensitivityoftheRelationshipBetweenAntarcticOCR.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/ccpo_pubs/378 doi:10.1029/2022JC019210 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1382/viewcontent/Dinniman_2023_SensitivityoftheRelationshipBetweenAntarcticOCR.pdf © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License , which permits use, distribution and reproduction in any medium, provided the original work is properly cited CCPO Publications Advection Antarctic ice sheet Antarctic ice shelves Atmospheric conditions Atmospheric effects Atmospheric forcing Atmospheric temperature Availability Biological uptake Blooms Chlorophyll Chlorophylls Coastal waters Continental shelves Deep water Deep water circulation Glaciation Ice cover Ice sheets Ice shelves Iron Land ice Light Melt water Meltwater Mixed layer Nutrients Ocean surface Oceans Photosynthesis Phytoplankton Plankton Polar environments Polynyas Sea ice Shoaling Summer Surface water Uptake Water circulation Winds Glaciology Hydrology Oceanography and Atmospheric Sciences and Meteorology article 2023 ftolddominionuni https://doi.org/10.1029/2022JC019210 2023-11-20T19:09:45Z Upward advection or mixing of iron-rich deep waters due to circulation changes driven by the rate of basal ice shelf melt was shown to be a primary control on chlorophyll a production in coastal polynyas over the Antarctic continental shelf. Here, the effects of atmospheric changes projected in 2100 on this relationship were examined with a 5-km resolution ocean/sea ice/ice shelf model of the Southern Ocean with different simulated dissolved iron sources and idealized biological uptake. The atmospheric changes are added as idealized increments to the forcing. Inclusion of a poleward shift and strengthening of the winds, increased precipitation, and warmer atmospheric temperatures resulted in doubling of the heat advected onto the continental shelf and an 83% increase in the total Antarctic ice shelf basal melt. The total dissolved iron supply to the surface waters over the continental shelf increased by 62%, while the surface iron supply due just to basal melt driven overturning increased by 48%. However, even though the ice shelf driven contribution becomes less important to the total iron supply on average (29% of total), the ice shelf involvement becomes relatively even more important in some locations, such as the Amundsen and Bellingshausen Seas. The modified atmospheric conditions also produced a reduction in summer sea ice extent and a shoaling of the summer mixed layers. These simulated responses to projected changes suggest relief of light and nutrient limitation for phytoplankton blooms over the Antarctic continental shelf and perhaps an increase in annual production in years to come. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice Southern Ocean Old Dominion University: ODU Digital Commons Antarctic Southern Ocean The Antarctic Journal of Geophysical Research: Oceans 128 2 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Advection Antarctic ice sheet Antarctic ice shelves Atmospheric conditions Atmospheric effects Atmospheric forcing Atmospheric temperature Availability Biological uptake Blooms Chlorophyll Chlorophylls Coastal waters Continental shelves Deep water Deep water circulation Glaciation Ice cover Ice sheets Ice shelves Iron Land ice Light Melt water Meltwater Mixed layer Nutrients Ocean surface Oceans Photosynthesis Phytoplankton Plankton Polar environments Polynyas Sea ice Shoaling Summer Surface water Uptake Water circulation Winds Glaciology Hydrology Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Advection Antarctic ice sheet Antarctic ice shelves Atmospheric conditions Atmospheric effects Atmospheric forcing Atmospheric temperature Availability Biological uptake Blooms Chlorophyll Chlorophylls Coastal waters Continental shelves Deep water Deep water circulation Glaciation Ice cover Ice sheets Ice shelves Iron Land ice Light Melt water Meltwater Mixed layer Nutrients Ocean surface Oceans Photosynthesis Phytoplankton Plankton Polar environments Polynyas Sea ice Shoaling Summer Surface water Uptake Water circulation Winds Glaciology Hydrology Oceanography and Atmospheric Sciences and Meteorology Dinniman, Michael S. St-Laurent, Pierre Arrigo, Kevin R. Hofmann, Eileen E. van Dijken, Gert L. Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
topic_facet |
Advection Antarctic ice sheet Antarctic ice shelves Atmospheric conditions Atmospheric effects Atmospheric forcing Atmospheric temperature Availability Biological uptake Blooms Chlorophyll Chlorophylls Coastal waters Continental shelves Deep water Deep water circulation Glaciation Ice cover Ice sheets Ice shelves Iron Land ice Light Melt water Meltwater Mixed layer Nutrients Ocean surface Oceans Photosynthesis Phytoplankton Plankton Polar environments Polynyas Sea ice Shoaling Summer Surface water Uptake Water circulation Winds Glaciology Hydrology Oceanography and Atmospheric Sciences and Meteorology |
description |
Upward advection or mixing of iron-rich deep waters due to circulation changes driven by the rate of basal ice shelf melt was shown to be a primary control on chlorophyll a production in coastal polynyas over the Antarctic continental shelf. Here, the effects of atmospheric changes projected in 2100 on this relationship were examined with a 5-km resolution ocean/sea ice/ice shelf model of the Southern Ocean with different simulated dissolved iron sources and idealized biological uptake. The atmospheric changes are added as idealized increments to the forcing. Inclusion of a poleward shift and strengthening of the winds, increased precipitation, and warmer atmospheric temperatures resulted in doubling of the heat advected onto the continental shelf and an 83% increase in the total Antarctic ice shelf basal melt. The total dissolved iron supply to the surface waters over the continental shelf increased by 62%, while the surface iron supply due just to basal melt driven overturning increased by 48%. However, even though the ice shelf driven contribution becomes less important to the total iron supply on average (29% of total), the ice shelf involvement becomes relatively even more important in some locations, such as the Amundsen and Bellingshausen Seas. The modified atmospheric conditions also produced a reduction in summer sea ice extent and a shoaling of the summer mixed layers. These simulated responses to projected changes suggest relief of light and nutrient limitation for phytoplankton blooms over the Antarctic continental shelf and perhaps an increase in annual production in years to come. |
format |
Article in Journal/Newspaper |
author |
Dinniman, Michael S. St-Laurent, Pierre Arrigo, Kevin R. Hofmann, Eileen E. van Dijken, Gert L. |
author_facet |
Dinniman, Michael S. St-Laurent, Pierre Arrigo, Kevin R. Hofmann, Eileen E. van Dijken, Gert L. |
author_sort |
Dinniman, Michael S. |
title |
Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
title_short |
Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
title_full |
Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
title_fullStr |
Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
title_full_unstemmed |
Sensitivity of the Relationship Between Antarctic Ice Shelves and Iron Supply to Projected Changes in the Atmospheric Forcing |
title_sort |
sensitivity of the relationship between antarctic ice shelves and iron supply to projected changes in the atmospheric forcing |
publisher |
ODU Digital Commons |
publishDate |
2023 |
url |
https://digitalcommons.odu.edu/ccpo_pubs/378 https://doi.org/10.1029/2022JC019210 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1382/viewcontent/Dinniman_2023_SensitivityoftheRelationshipBetweenAntarcticOCR.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice Southern Ocean |
op_source |
CCPO Publications |
op_relation |
https://digitalcommons.odu.edu/ccpo_pubs/378 doi:10.1029/2022JC019210 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1382/viewcontent/Dinniman_2023_SensitivityoftheRelationshipBetweenAntarcticOCR.pdf |
op_rights |
© 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License , which permits use, distribution and reproduction in any medium, provided the original work is properly cited |
op_doi |
https://doi.org/10.1029/2022JC019210 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
128 |
container_issue |
2 |
_version_ |
1785524928753172480 |