Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition
Since 1980, atmospheric pollutants in South Asia and India have dramatically increased in response to industrialization and agricultural development, enhancing the atmospheric deposition of anthropogenic nitrogen in the northern Indian Ocean and potentially promoting primary productivity. Concurrent...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1418634/full |
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| author | Manon Malsang Manon Malsang Laure Resplandy Laure Resplandy Laurent Bopp Laurent Bopp Laurent Bopp Yangyang Zhao Sam Ditkovsky Fan Yang Fabien Paulot Marina Lévy |
| author_facet | Manon Malsang Manon Malsang Laure Resplandy Laure Resplandy Laurent Bopp Laurent Bopp Laurent Bopp Yangyang Zhao Sam Ditkovsky Fan Yang Fabien Paulot Marina Lévy |
| author_sort | Manon Malsang |
| collection | DOAJ |
| description | Since 1980, atmospheric pollutants in South Asia and India have dramatically increased in response to industrialization and agricultural development, enhancing the atmospheric deposition of anthropogenic nitrogen in the northern Indian Ocean and potentially promoting primary productivity. Concurrently, ocean warming has increased stratification and limited the supply of nutrients supporting primary productivity. Here, we examine the biogeochemical consequences of increasing anthropogenic atmospheric nitrogen deposition and contrast them with the counteracting effect of warming, using a regional ocean biogeochemical model of the northern Indian Ocean forced with atmospheric nitrogen deposition derived from an Earth System Model. Our results suggest that the 60% recent increase in anthropogenic nitrogen deposition over the northern Indian Ocean provided external reactive nitrogen that only weakly enhanced primary production (+10 mg C.m–2.d–1.yr–1 in regions of intense deposition) and secondary production (+4 mg C.m–2.d–1.yr–1). However, we find that locally this enhancement can significantly offset the declining trend in primary production over the last four decades in the central Arabian Sea and western Bay of Bengal, whose magnitude are up to -20 and -10 mg C.m–2.d–1.yr–1 respectively. |
| format | Article |
| id | doaj-art-d76d05d3dc1f4ea2ab1f66dd3ea9ff1f |
| institution | DOAJ |
| issn | 2296-7745 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Marine Science |
| spelling | doaj-art-d76d05d3dc1f4ea2ab1f66dd3ea9ff1f2025-08-20T02:57:29ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-12-011110.3389/fmars.2024.14186341418634Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen depositionManon Malsang0Manon Malsang1Laure Resplandy2Laure Resplandy3Laurent Bopp4Laurent Bopp5Laurent Bopp6Yangyang Zhao7Sam Ditkovsky8Fan Yang9Fabien Paulot10Marina Lévy11UMR7159 Laboratoire d’Océanographie et du Climat Expérimentations et Approches Numériques (LOCEAN), Institut Pierre-Simon Laplace (IPSL), Sorbonne Université, UB, Paris, FranceDepartment of Geosciences, Princeton University, Princeton, NJ, United StatesDepartment of Geosciences, Princeton University, Princeton, NJ, United StatesHigh Meadows Environmental Institute, Princeton University, Princeton, NJ, United StatesLaboratoire de Météorologie Dynamique, Sorbonne Université (CNRS), Paris, Île-de-France, FranceLaboratoire de Météorologie Dynamique, Institut Pierre-Simon Laplace, CNRS, École Normale Supérieure, Université PSL, Sorbonne Université, École Polytechnique, Paris, FranceDépartement de Géosciences, École Normale Supérieure, Paris, FranceHigh Meadows Environmental Institute, Princeton University, Princeton, NJ, United StatesDepartment of Geosciences, Princeton University, Princeton, NJ, United StatesHigh Meadows Environmental Institute, Princeton University, Princeton, NJ, United StatesGeophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United StatesUMR7159 Laboratoire d’Océanographie et du Climat Expérimentations et Approches Numériques (LOCEAN), Institut Pierre-Simon Laplace (IPSL), Sorbonne Université, UB, Paris, FranceSince 1980, atmospheric pollutants in South Asia and India have dramatically increased in response to industrialization and agricultural development, enhancing the atmospheric deposition of anthropogenic nitrogen in the northern Indian Ocean and potentially promoting primary productivity. Concurrently, ocean warming has increased stratification and limited the supply of nutrients supporting primary productivity. Here, we examine the biogeochemical consequences of increasing anthropogenic atmospheric nitrogen deposition and contrast them with the counteracting effect of warming, using a regional ocean biogeochemical model of the northern Indian Ocean forced with atmospheric nitrogen deposition derived from an Earth System Model. Our results suggest that the 60% recent increase in anthropogenic nitrogen deposition over the northern Indian Ocean provided external reactive nitrogen that only weakly enhanced primary production (+10 mg C.m–2.d–1.yr–1 in regions of intense deposition) and secondary production (+4 mg C.m–2.d–1.yr–1). However, we find that locally this enhancement can significantly offset the declining trend in primary production over the last four decades in the central Arabian Sea and western Bay of Bengal, whose magnitude are up to -20 and -10 mg C.m–2.d–1.yr–1 respectively.https://www.frontiersin.org/articles/10.3389/fmars.2024.1418634/fullatmospheric depositionprimary productionexportIndian Oceanbiogeochemical cyclinganthropogenic aerosols |
| spellingShingle | Manon Malsang Manon Malsang Laure Resplandy Laure Resplandy Laurent Bopp Laurent Bopp Laurent Bopp Yangyang Zhao Sam Ditkovsky Fan Yang Fabien Paulot Marina Lévy Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition Frontiers in Marine Science atmospheric deposition primary production export Indian Ocean biogeochemical cycling anthropogenic aerosols |
| title | Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition |
| title_full | Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition |
| title_fullStr | Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition |
| title_full_unstemmed | Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition |
| title_short | Contemporary decline in northern Indian Ocean primary production offset by rising atmospheric nitrogen deposition |
| title_sort | contemporary decline in northern indian ocean primary production offset by rising atmospheric nitrogen deposition |
| topic | atmospheric deposition primary production export Indian Ocean biogeochemical cycling anthropogenic aerosols |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1418634/full |
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