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

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dc.contributor.authorMariotti, V
dc.contributor.authorBopp, L
dc.contributor.authorTagliabue, A
dc.contributor.authorKageyama, M
dc.contributor.authorSwingedouw, D
dc.date.accessioned2021-10-08T06:55:01Z
dc.date.available2021-10-08T06:55:01Z
dc.date.issued2012
dc.description.abstractMarine 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 (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 opposite 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 enables to decipher the mechanisms behind the observed changes in the response to Heinrich events.
dc.identifier.apacitationMariotti, V., Bopp, L., Tagliabue, A., Kageyama, M., & Swingedouw, D. (2012). Marine productivity response to Heinrich events: a model-data comparison. <i>Climate of the Past</i>, 8(5), 1581 - 1598. http://hdl.handle.net/11427/34396en_ZA
dc.identifier.chicagocitationMariotti, V, L Bopp, A Tagliabue, M Kageyama, and D Swingedouw "Marine productivity response to Heinrich events: a model-data comparison." <i>Climate of the Past</i> 8, 5. (2012): 1581 - 1598. http://hdl.handle.net/11427/34396en_ZA
dc.identifier.citationMariotti, V., Bopp, L., Tagliabue, A., Kageyama, M. & Swingedouw, D. 2012. Marine productivity response to Heinrich events: a model-data comparison. <i>Climate of the Past.</i> 8(5):1581 - 1598. http://hdl.handle.net/11427/34396en_ZA
dc.identifier.issn1814-9324
dc.identifier.issn1814-9332
dc.identifier.ris TY - Journal 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 (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 opposite 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 enables to decipher the mechanisms behind the observed changes in the response to Heinrich events. DA - 2012 DB - OpenUCT DP - University of Cape Town IS - 5 J1 - Climate of the Past LK - https://open.uct.ac.za PY - 2012 SM - 1814-9324 SM - 1814-9332 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/11427/34396 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34396
dc.identifier.vancouvercitationMariotti V, Bopp L, Tagliabue A, Kageyama M, Swingedouw D. Marine productivity response to Heinrich events: a model-data comparison. Climate of the Past. 2012;8(5):1581 - 1598. http://hdl.handle.net/11427/34396.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Oceanography
dc.publisher.facultyFaculty of Science
dc.sourceClimate of the Past
dc.source.journalissue5
dc.source.journalvolume8
dc.source.pagination1581 - 1598
dc.source.urihttps://dx.doi.org/10.5194/cp-8-1581-2012
dc.subject.otherGeography. Anthropology. Recreation
dc.subject.otherTD169-171.8
dc.subject.otherGE1-350
dc.subject.otherEnvironmental pollution
dc.subject.otherTD172-193.5
dc.subject.otherEnvironmental sciences
dc.subject.otherDOAJ:Earth and Environmental Sciences
dc.subject.otherG
dc.subject.otherDOAJ:Environmental Sciences
dc.subject.otherEnvironmental protection
dc.titleMarine productivity response to Heinrich events: a model-data comparison
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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