Marine productivity response to Heinrich events: a model-data comparison
International audience 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 ocea...
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ftccsdartic:oai:HAL:hal-04113967v1 2023-06-18T03:41:57+02:00 Marine productivity response to Heinrich events: a model-data comparison Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal.science/hal-04113967 https://doi.org/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 hal-04113967 https://hal.science/hal-04113967 BIBCODE: 2012CliPa.8.1581M doi:10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 Climate of the Past https://hal.science/hal-04113967 Climate of the Past, 2012, 8, pp.1581-1598. ⟨10.5194/cp-8-1581-201210.5194/cpd-8-557-2012⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 2023-06-03T23:50:33Z International audience 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Pacific |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. Marine productivity response to Heinrich events: a model-data comparison |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience 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. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mariotti, V. Bopp, L. Tagliabue, A. Kageyama, M. Swingedouw, D. |
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 |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-04113967 https://doi.org/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Climate of the Past https://hal.science/hal-04113967 Climate of the Past, 2012, 8, pp.1581-1598. ⟨10.5194/cp-8-1581-201210.5194/cpd-8-557-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 hal-04113967 https://hal.science/hal-04113967 BIBCODE: 2012CliPa.8.1581M doi:10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 |
op_doi |
https://doi.org/10.5194/cp-8-1581-201210.5194/cpd-8-557-2012 |
_version_ |
1769007695031959552 |