Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica
The Amundsen Sea Polynya (ASP) is distinguished by having the highest net primary production per unit area in the coastal Antarctic. Recent studies have related this high productivity to the presence of fast-melting ice shelves, but the mechanisms involved are not well understood. In this study we d...
Published in: | Journal of Geophysical Research: Oceans |
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2019
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Online Access: | https://scholarworks.wm.edu/vimsarticles/1377 https://scholarworks.wm.edu/context/vimsarticles/article/2368/viewcontent/St_Laurent_et_al_2019_Journal_of_Geophysical_Research__Oceans.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/0/type/additional/viewcontent/St_Laurent_et_al_2019_JGR__Oceans.sup_1.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/1/type/additional/viewcontent/St_Laurent_jgrc_sup_0002_supplementary_movie.mp4 |
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2368 2023-06-11T04:03:34+02:00 Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica St-Laurent, P. Yager, PL Sherrell, RM Oliver, H. Dinniman, MS Stammerjohn, SE 2019-02-07T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1377 doi: 10.1029/2018JC014773 https://scholarworks.wm.edu/context/vimsarticles/article/2368/viewcontent/St_Laurent_et_al_2019_Journal_of_Geophysical_Research__Oceans.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/0/type/additional/viewcontent/St_Laurent_et_al_2019_JGR__Oceans.sup_1.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/1/type/additional/viewcontent/St_Laurent_jgrc_sup_0002_supplementary_movie.mp4 unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1377 doi: 10.1029/2018JC014773 https://scholarworks.wm.edu/context/vimsarticles/article/2368/viewcontent/St_Laurent_et_al_2019_Journal_of_Geophysical_Research__Oceans.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/0/type/additional/viewcontent/St_Laurent_et_al_2019_JGR__Oceans.sup_1.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/1/type/additional/viewcontent/St_Laurent_jgrc_sup_0002_supplementary_movie.mp4 http://creativecommons.org/licenses/by-nc-nd/4.0/ VIMS Articles Biological Sciences Peer-Reviewed Articles Oceanography text 2019 ftwilliammarycol https://doi.org/10.1029/2018JC014773 2023-05-04T17:44:32Z The Amundsen Sea Polynya (ASP) is distinguished by having the highest net primary production per unit area in the coastal Antarctic. Recent studies have related this high productivity to the presence of fast-melting ice shelves, but the mechanisms involved are not well understood. In this study we describe the first numerical model of the ASP to represent explicitly the ocean-ice interactions, nitrogen and iron cycles, and the coastal circulation at high resolution. The study focuses on the seasonal cycle of iron and carbon, and the results are broadly consistent with field observations collected during the summer of 2010–2011. The simulated biogeochemical cycle is strongly controlled by light availability(dictated by sea ice, phytoplankton self-shading, and variable sunlight). The micronutrient iron exhibits strong seasonality, where scavenging by biogenic particles and remineralization play large compensating roles. Lateral fluxes of iron are also important to the iron budget, and our results confirm the key role played by inputs of dissolved iron from the buoyancy-driven circulation of melting ice shelf cavities (the“meltwater pump”). The model suggests that westward flowing coastal circulation plays two important roles: it provides additional iron to the ASP and it collects particulate organic matter generated by the bloom and transports it to the west of the ASP. As a result, maps of vertical particulate organic matter fluxes show highest fluxes in shelf regions located west of the productive central ASP. Overall, these model results improve our mechanistic understanding of the ASP bloom, while suggesting testable hypotheses for future field efforts. Text Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice W&M ScholarWorks Antarctic Amundsen Sea Journal of Geophysical Research: Oceans 124 3 1544 1565 |
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W&M ScholarWorks |
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ftwilliammarycol |
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topic |
Biological Sciences Peer-Reviewed Articles Oceanography |
spellingShingle |
Biological Sciences Peer-Reviewed Articles Oceanography St-Laurent, P. Yager, PL Sherrell, RM Oliver, H. Dinniman, MS Stammerjohn, SE Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
topic_facet |
Biological Sciences Peer-Reviewed Articles Oceanography |
description |
The Amundsen Sea Polynya (ASP) is distinguished by having the highest net primary production per unit area in the coastal Antarctic. Recent studies have related this high productivity to the presence of fast-melting ice shelves, but the mechanisms involved are not well understood. In this study we describe the first numerical model of the ASP to represent explicitly the ocean-ice interactions, nitrogen and iron cycles, and the coastal circulation at high resolution. The study focuses on the seasonal cycle of iron and carbon, and the results are broadly consistent with field observations collected during the summer of 2010–2011. The simulated biogeochemical cycle is strongly controlled by light availability(dictated by sea ice, phytoplankton self-shading, and variable sunlight). The micronutrient iron exhibits strong seasonality, where scavenging by biogenic particles and remineralization play large compensating roles. Lateral fluxes of iron are also important to the iron budget, and our results confirm the key role played by inputs of dissolved iron from the buoyancy-driven circulation of melting ice shelf cavities (the“meltwater pump”). The model suggests that westward flowing coastal circulation plays two important roles: it provides additional iron to the ASP and it collects particulate organic matter generated by the bloom and transports it to the west of the ASP. As a result, maps of vertical particulate organic matter fluxes show highest fluxes in shelf regions located west of the productive central ASP. Overall, these model results improve our mechanistic understanding of the ASP bloom, while suggesting testable hypotheses for future field efforts. |
format |
Text |
author |
St-Laurent, P. Yager, PL Sherrell, RM Oliver, H. Dinniman, MS Stammerjohn, SE |
author_facet |
St-Laurent, P. Yager, PL Sherrell, RM Oliver, H. Dinniman, MS Stammerjohn, SE |
author_sort |
St-Laurent, P. |
title |
Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
title_short |
Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
title_full |
Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
title_fullStr |
Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
title_full_unstemmed |
Modeling the Seasonal Cycle of Iron and Carbon Fluxes in the Amundsen Sea Polynya, Antarctica |
title_sort |
modeling the seasonal cycle of iron and carbon fluxes in the amundsen sea polynya, antarctica |
publisher |
W&M ScholarWorks |
publishDate |
2019 |
url |
https://scholarworks.wm.edu/vimsarticles/1377 https://scholarworks.wm.edu/context/vimsarticles/article/2368/viewcontent/St_Laurent_et_al_2019_Journal_of_Geophysical_Research__Oceans.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/0/type/additional/viewcontent/St_Laurent_et_al_2019_JGR__Oceans.sup_1.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/1/type/additional/viewcontent/St_Laurent_jgrc_sup_0002_supplementary_movie.mp4 |
geographic |
Antarctic Amundsen Sea |
geographic_facet |
Antarctic Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1377 doi: 10.1029/2018JC014773 https://scholarworks.wm.edu/context/vimsarticles/article/2368/viewcontent/St_Laurent_et_al_2019_Journal_of_Geophysical_Research__Oceans.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/0/type/additional/viewcontent/St_Laurent_et_al_2019_JGR__Oceans.sup_1.pdf https://scholarworks.wm.edu/context/vimsarticles/article/2368/filename/1/type/additional/viewcontent/St_Laurent_jgrc_sup_0002_supplementary_movie.mp4 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2018JC014773 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
3 |
container_start_page |
1544 |
op_container_end_page |
1565 |
_version_ |
1768380431252586496 |