Marine productivity response to Heinrich events: a model-data comparison
Marine sediments records suggest large changes in marine productivity during glacial periods, with abrupt variations especially during the Heinrich events. Here, we study the response of marine biogeochemistry to such an event by using a biogeochemical model of the global ocean (PISCES) coupled to a...
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ftarchimer:oai:archimer.ifremer.fr:37695 2023-05-15T17:30:52+02:00 Marine productivity response to Heinrich events: a model-data comparison Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. 2012 application/pdf https://archimer.ifremer.fr/doc/00266/37695/35833.pdf https://archimer.ifremer.fr/doc/00266/37695/35834.pdf https://doi.org/10.5194/cp-8-1581-2012 https://archimer.ifremer.fr/doc/00266/37695/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00266/37695/35833.pdf https://archimer.ifremer.fr/doc/00266/37695/35834.pdf doi:10.5194/cp-8-1581-2012 https://archimer.ifremer.fr/doc/00266/37695/ Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2012 , Vol. 8 , N. 5 , P. 1581-1598 text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.5194/cp-8-1581-2012 2021-09-23T20:26:12Z Marine sediments records suggest large changes in marine productivity during glacial periods, with abrupt variations especially during the Heinrich events. Here, we study the response of marine biogeochemistry to such an event by using a biogeochemical model of the global ocean (PISCES) coupled to an ocean-atmosphere general circulation model (IPSL-CM4). We conduct a 400-yr-long transient simulation under glacial climate conditions with a freshwater forcing of 0.1 Sv applied to the North Atlantic to mimic a Heinrich event, alongside a glacial control simulation. To evaluate our numerical results, we have compiled the available marine productivity records covering Heinrich events. We find that simulated primary productivity and organic carbon export decrease globally (by 16% for both) during a Heinrich event, albeit with large regional variations. In our experiments, the North Atlantic displays a significant decrease, whereas the Southern Ocean shows an increase, in agreement with paleo-productivity reconstructions. In the Equatorial Pacific, the model simulates an increase in organic matter export production but decreased biogenic silica export. This antagonistic behaviour results from changes in relative uptake of carbon and silicic acid by diatoms. Reasonable agreement between model and data for the large-scale response to Heinrich events gives confidence in models used to predict future centennial changes in marine production. In addition, our model allows us to investigate the mechanisms behind the observed changes in the response to Heinrich events. Article in Journal/Newspaper North Atlantic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Southern Ocean Climate of the Past 8 5 1581 1598 |
institution |
Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Marine sediments records suggest large changes in marine productivity during glacial periods, with abrupt variations especially during the Heinrich events. Here, we study the response of marine biogeochemistry to such an event by using a biogeochemical model of the global ocean (PISCES) coupled to an ocean-atmosphere general circulation model (IPSL-CM4). We conduct a 400-yr-long transient simulation under glacial climate conditions with a freshwater forcing of 0.1 Sv applied to the North Atlantic to mimic a Heinrich event, alongside a glacial control simulation. To evaluate our numerical results, we have compiled the available marine productivity records covering Heinrich events. We find that simulated primary productivity and organic carbon export decrease globally (by 16% for both) during a Heinrich event, albeit with large regional variations. In our experiments, the North Atlantic displays a significant decrease, whereas the Southern Ocean shows an increase, in agreement with paleo-productivity reconstructions. In the Equatorial Pacific, the model simulates an increase in organic matter export production but decreased biogenic silica export. This antagonistic behaviour results from changes in relative uptake of carbon and silicic acid by diatoms. Reasonable agreement between model and data for the large-scale response to Heinrich events gives confidence in models used to predict future centennial changes in marine production. In addition, our model allows us to investigate the mechanisms behind the observed changes in the response to Heinrich events. |
format |
Article in Journal/Newspaper |
author |
Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. |
spellingShingle |
Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. Marine productivity response to Heinrich events: a model-data comparison |
author_facet |
Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. |
author_sort |
Mariotti, V. |
title |
Marine productivity response to Heinrich events: a model-data comparison |
title_short |
Marine productivity response to Heinrich events: a model-data comparison |
title_full |
Marine productivity response to Heinrich events: a model-data comparison |
title_fullStr |
Marine productivity response to Heinrich events: a model-data comparison |
title_full_unstemmed |
Marine productivity response to Heinrich events: a model-data comparison |
title_sort |
marine productivity response to heinrich events: a model-data comparison |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00266/37695/35833.pdf https://archimer.ifremer.fr/doc/00266/37695/35834.pdf https://doi.org/10.5194/cp-8-1581-2012 https://archimer.ifremer.fr/doc/00266/37695/ |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2012 , Vol. 8 , N. 5 , P. 1581-1598 |
op_relation |
https://archimer.ifremer.fr/doc/00266/37695/35833.pdf https://archimer.ifremer.fr/doc/00266/37695/35834.pdf doi:10.5194/cp-8-1581-2012 https://archimer.ifremer.fr/doc/00266/37695/ |
op_rights |
Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-8-1581-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
5 |
container_start_page |
1581 |
op_container_end_page |
1598 |
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1766127997685858304 |