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Marine productivity response to Heinrich events: a model-data comparison

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dc.contributor.author Mariotti, V
dc.contributor.author Bopp, L
dc.contributor.author Tagliabue, A
dc.contributor.author Kageyama, M
dc.contributor.author Swingedouw, D
dc.date.accessioned 2013-05-03T12:18:33Z
dc.date.available 2013-05-03T12:18:33Z
dc.date.issued 2012-10
dc.identifier.citation Mariotti, V, Bopp, L, Tagliabue, A, Kageyama, M and Swingedouw, D. 2012. Marine productivity response to Heinrich events: a model-data comparison. Climate of the Past, vol. 8(5), pp 1581-1598 en_US
dc.identifier.issn 1814-9324
dc.identifier.uri http://www.clim-past.net/8/1581/2012/cp-8-1581-2012.pdf
dc.identifier.uri http://hdl.handle.net/10204/6720
dc.description Copyright: 2012 European Geosciences Union. This is an Open Access journal. This journal authorizes the publication of the information herewith contained. Published in Climate of the Past, vol. 8(5), pp 1581-1598 en_US
dc.description.abstract 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. en_US
dc.language.iso en en_US
dc.publisher European Geosciences Union en_US
dc.relation.ispartofseries Workflow;10245
dc.subject Marine sediments en_US
dc.subject Heinrich events en_US
dc.subject Marine productivity en_US
dc.title Marine productivity response to Heinrich events: a model-data comparison en_US
dc.type Article en_US
dc.identifier.apacitation Mariotti, V., Bopp, L., Tagliabue, A., Kageyama, M., & Swingedouw, D. (2012). Marine productivity response to Heinrich events: a model-data comparison. http://hdl.handle.net/10204/6720 en_ZA
dc.identifier.chicagocitation Mariotti, V, L Bopp, A Tagliabue, M Kageyama, and D Swingedouw "Marine productivity response to Heinrich events: a model-data comparison." (2012) http://hdl.handle.net/10204/6720 en_ZA
dc.identifier.vancouvercitation Mariotti V, Bopp L, Tagliabue A, Kageyama M, Swingedouw D. Marine productivity response to Heinrich events: a model-data comparison. 2012; http://hdl.handle.net/10204/6720. en_ZA
dc.identifier.ris TY - Article AU - Mariotti, V AU - Bopp, L AU - Tagliabue, A AU - Kageyama, M AU - Swingedouw, D AB - 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. DA - 2012-10 DB - ResearchSpace DP - CSIR KW - Marine sediments KW - Heinrich events KW - Marine productivity LK - https://researchspace.csir.co.za PY - 2012 SM - 1814-9324 T1 - Marine productivity response to Heinrich events: a model-data comparison TI - Marine productivity response to Heinrich events: a model-data comparison UR - http://hdl.handle.net/10204/6720 ER - en_ZA


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