Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean
It has been suggested that the freshwater flux due to the recent melting of the Antarctic ice-sheet/shelf will suppress ventilation in the Southern Ocean (SO). In this study, we performed idealized earth-system simulations to examine the impacts of Antarctic meltwater on the biomass of surface phyto...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/ac444e |
| _version_ | 1797747153007804416 |
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| author | Ji-Hoon Oh Kyung Min Noh Hyung-Gyu Lim Emilia Kyung Jin Sang-Yoon Jun Jong-Seong Kug |
| author_facet | Ji-Hoon Oh Kyung Min Noh Hyung-Gyu Lim Emilia Kyung Jin Sang-Yoon Jun Jong-Seong Kug |
| author_sort | Ji-Hoon Oh |
| collection | DOAJ |
| description | It has been suggested that the freshwater flux due to the recent melting of the Antarctic ice-sheet/shelf will suppress ventilation in the Southern Ocean (SO). In this study, we performed idealized earth-system simulations to examine the impacts of Antarctic meltwater on the biomass of surface phytoplankton in the Antarctic Ocean. The enhanced stratification due to the meltwater leads to a decrease in surface nitrate concentration, but an increase in the surface concentration of dissolved iron. These changes are associated with the reduced upwelling of nitrate-rich deep water and the trapped iron exported from terrestrial sediment. Because of the limited iron availability in the SO, the trapped iron in surface water enhances the chlorophyll concentration in the open ocean. However, in the marginal sea along the Antarctic coastline where the iron is relatively sufficient, a nitrate reduction induces a chlorophyll decrease, indicating a regime shift from iron-limited to nitrate-limited conditions. |
| first_indexed | 2024-03-12T15:47:05Z |
| format | Article |
| id | doaj.art-81a25b5b233a492aa706dd2d0b94fddb |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:47:05Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-81a25b5b233a492aa706dd2d0b94fddb2023-08-09T15:23:28ZengIOP PublishingEnvironmental Research Letters1748-93262022-01-0117202402210.1088/1748-9326/ac444eAntarctic meltwater-induced dynamical changes in phytoplankton in the Southern OceanJi-Hoon Oh0https://orcid.org/0000-0001-8484-8997Kyung Min Noh1Hyung-Gyu Lim2Emilia Kyung Jin3Sang-Yoon Jun4Jong-Seong Kug5https://orcid.org/0000-0003-2251-2579Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673, Republic of Korea; Princeton University/Atmosphere and Oceanic Sciences Program , Princeton, NJ 08540, United States of AmericaKorea Polar Research Institute (KOPRI) , Incheon 21990, Republic of KoreaKorea Polar Research Institute (KOPRI) , Incheon 21990, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673, Republic of Korea; Institute for Convergence Research and Education in Advanced Technology, Yonsei University , Seoul, Republic of KoreaIt has been suggested that the freshwater flux due to the recent melting of the Antarctic ice-sheet/shelf will suppress ventilation in the Southern Ocean (SO). In this study, we performed idealized earth-system simulations to examine the impacts of Antarctic meltwater on the biomass of surface phytoplankton in the Antarctic Ocean. The enhanced stratification due to the meltwater leads to a decrease in surface nitrate concentration, but an increase in the surface concentration of dissolved iron. These changes are associated with the reduced upwelling of nitrate-rich deep water and the trapped iron exported from terrestrial sediment. Because of the limited iron availability in the SO, the trapped iron in surface water enhances the chlorophyll concentration in the open ocean. However, in the marginal sea along the Antarctic coastline where the iron is relatively sufficient, a nitrate reduction induces a chlorophyll decrease, indicating a regime shift from iron-limited to nitrate-limited conditions.https://doi.org/10.1088/1748-9326/ac444eAntarctic meltwaterAntarctic ice-sheet/shelfSouthern Oceanchlorophyllphytoplankton |
| spellingShingle | Ji-Hoon Oh Kyung Min Noh Hyung-Gyu Lim Emilia Kyung Jin Sang-Yoon Jun Jong-Seong Kug Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean Environmental Research Letters Antarctic meltwater Antarctic ice-sheet/shelf Southern Ocean chlorophyll phytoplankton |
| title | Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean |
| title_full | Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean |
| title_fullStr | Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean |
| title_full_unstemmed | Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean |
| title_short | Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean |
| title_sort | antarctic meltwater induced dynamical changes in phytoplankton in the southern ocean |
| topic | Antarctic meltwater Antarctic ice-sheet/shelf Southern Ocean chlorophyll phytoplankton |
| url | https://doi.org/10.1088/1748-9326/ac444e |
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