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| Titel |
Marine productivity response to Heinrich events: a model-data comparison |
| VerfasserIn |
V. Mariotti, L. Bopp, A. Tagliabue, M. Kageyama, D. Swingedouw |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 5 ; Nr. 8, no. 5 (2012-10-16), S.1581-1598 |
| Datensatznummer |
250005844
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| Publikation (Nr.) |
 copernicus.org/cp-8-1581-2012.pdf |
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| Zusammenfassung |
| 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. |
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