Sustenance of phytoplankton in the subpolar North Atlantic during winter
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 6531-6548, doi:10.1029/2017JC013639. We consider two fact...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10678 2023-05-15T17:35:22+02:00 Sustenance of phytoplankton in the subpolar North Atlantic during winter Karimpour, Farid Tandon, Amit Mahadevan, Amala 2018-09-14 https://hdl.handle.net/1912/10678 en_US eng John Wiley & Sons https://doi.org/10.1029/2017JC013639 Journal of Geophysical Research: Oceans 123 (2018): 6531-6548 https://hdl.handle.net/1912/10678 doi:10.1029/2017JC013639 Journal of Geophysical Research: Oceans 123 (2018): 6531-6548 doi:10.1029/2017JC013639 Article 2018 ftwhoas https://doi.org/10.1029/2017JC013639 2022-05-28T23:00:30Z Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 6531-6548, doi:10.1029/2017JC013639. We consider two factors that affect the mixed layer depth (MLD) and potentially contribute to phytoplankton sustenance over winter—variability of air‐sea fluxes and three‐dimensional processes arising from horizontal density gradients (fronts). The role of these two factors is addressed using several three‐dimensional idealized numerical simulations in a process study ocean model forced with air‐sea fluxes at different temporal averaging frequencies. Results show that in winter, when the average mixed layer is much deeper than the euphotic layer and the period of daylight is short, phytoplankton production is relatively insensitive to high‐frequency variability in air‐sea fluxes. Short‐lived stratification events during light‐limited conditions have very little impact on phytoplankton production. On the other hand, the slumping of fronts shallows the mixed layer in a patchy manner and the associated restratification persists considerably longer than that caused by changes in air‐sea fluxes. Simulations with fronts show that in winter, the average MLD is about 600 m shallower than simulations without fronts. Prior to spring warming, the depth‐integrated phytoplankton concentration in the model with fronts is about twice as large as the case without fronts. Hence, even in winter, restratification by fronts is important for setting the MLD; it increases the residence time of phytoplankton in the euphotic layer and contributes to phytoplankton growth, thereby sustaining phytoplankton populations in winter. Higher model resolution intensifies submesoscale dynamics, leading to stronger restratification, shallower mixed layers, greater variability in the MLD, and more production of phytoplankton. National Science Foundation Grant Numbers: ... Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Geophysical Research: Oceans 123 9 6531 6548 |
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Open Polar |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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ftwhoas |
language |
English |
description |
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 6531-6548, doi:10.1029/2017JC013639. We consider two factors that affect the mixed layer depth (MLD) and potentially contribute to phytoplankton sustenance over winter—variability of air‐sea fluxes and three‐dimensional processes arising from horizontal density gradients (fronts). The role of these two factors is addressed using several three‐dimensional idealized numerical simulations in a process study ocean model forced with air‐sea fluxes at different temporal averaging frequencies. Results show that in winter, when the average mixed layer is much deeper than the euphotic layer and the period of daylight is short, phytoplankton production is relatively insensitive to high‐frequency variability in air‐sea fluxes. Short‐lived stratification events during light‐limited conditions have very little impact on phytoplankton production. On the other hand, the slumping of fronts shallows the mixed layer in a patchy manner and the associated restratification persists considerably longer than that caused by changes in air‐sea fluxes. Simulations with fronts show that in winter, the average MLD is about 600 m shallower than simulations without fronts. Prior to spring warming, the depth‐integrated phytoplankton concentration in the model with fronts is about twice as large as the case without fronts. Hence, even in winter, restratification by fronts is important for setting the MLD; it increases the residence time of phytoplankton in the euphotic layer and contributes to phytoplankton growth, thereby sustaining phytoplankton populations in winter. Higher model resolution intensifies submesoscale dynamics, leading to stronger restratification, shallower mixed layers, greater variability in the MLD, and more production of phytoplankton. National Science Foundation Grant Numbers: ... |
format |
Article in Journal/Newspaper |
author |
Karimpour, Farid Tandon, Amit Mahadevan, Amala |
spellingShingle |
Karimpour, Farid Tandon, Amit Mahadevan, Amala Sustenance of phytoplankton in the subpolar North Atlantic during winter |
author_facet |
Karimpour, Farid Tandon, Amit Mahadevan, Amala |
author_sort |
Karimpour, Farid |
title |
Sustenance of phytoplankton in the subpolar North Atlantic during winter |
title_short |
Sustenance of phytoplankton in the subpolar North Atlantic during winter |
title_full |
Sustenance of phytoplankton in the subpolar North Atlantic during winter |
title_fullStr |
Sustenance of phytoplankton in the subpolar North Atlantic during winter |
title_full_unstemmed |
Sustenance of phytoplankton in the subpolar North Atlantic during winter |
title_sort |
sustenance of phytoplankton in the subpolar north atlantic during winter |
publisher |
John Wiley & Sons |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10678 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Geophysical Research: Oceans 123 (2018): 6531-6548 doi:10.1029/2017JC013639 |
op_relation |
https://doi.org/10.1029/2017JC013639 Journal of Geophysical Research: Oceans 123 (2018): 6531-6548 https://hdl.handle.net/1912/10678 doi:10.1029/2017JC013639 |
op_doi |
https://doi.org/10.1029/2017JC013639 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
9 |
container_start_page |
6531 |
op_container_end_page |
6548 |
_version_ |
1766134506296705024 |