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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ftunivcapetownir:oai:localhost:11427/34396 2023-05-15T17:31:04+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 http://hdl.handle.net/11427/34396 https://open.uct.ac.za/bitstream/11427/34396/1/MariottiV_Marine_producti_2012.pdf eng eng Faculty of Science Department of Oceanography http://hdl.handle.net/11427/34396 https://open.uct.ac.za/bitstream/11427/34396/1/MariottiV_Marine_producti_2012.pdf Climate of the Past https://dx.doi.org/10.5194/cp-8-1581-2012 8 5 1581 - 1598 Geography. Anthropology. Recreation TD169-171.8 GE1-350 Environmental pollution TD172-193.5 Environmental sciences DOAJ:Earth and Environmental Sciences G DOAJ:Environmental Sciences Environmental protection Journal Article 2012 ftunivcapetownir https://doi.org/10.5194/cp-8-1581-2012 2022-09-13T05:46:30Z 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. Article in Journal/Newspaper North Atlantic Southern Ocean University of Cape Town: OpenUCT Pacific Southern Ocean Climate of the Past 8 5 1581 1598 |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Geography. Anthropology. Recreation TD169-171.8 GE1-350 Environmental pollution TD172-193.5 Environmental sciences DOAJ:Earth and Environmental Sciences G DOAJ:Environmental Sciences Environmental protection |
spellingShingle |
Geography. Anthropology. Recreation TD169-171.8 GE1-350 Environmental pollution TD172-193.5 Environmental sciences DOAJ:Earth and Environmental Sciences G DOAJ:Environmental Sciences Environmental protection Mariotti, V Bopp, L Tagliabue, A Kageyama, M Swingedouw, D Marine productivity response to Heinrich events: a model-data comparison |
topic_facet |
Geography. Anthropology. Recreation TD169-171.8 GE1-350 Environmental pollution TD172-193.5 Environmental sciences DOAJ:Earth and Environmental Sciences G DOAJ:Environmental Sciences Environmental protection |
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 (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. |
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 |
Faculty of Science |
publishDate |
2012 |
url |
http://hdl.handle.net/11427/34396 https://open.uct.ac.za/bitstream/11427/34396/1/MariottiV_Marine_producti_2012.pdf |
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 https://dx.doi.org/10.5194/cp-8-1581-2012 8 5 1581 - 1598 |
op_relation |
http://hdl.handle.net/11427/34396 https://open.uct.ac.za/bitstream/11427/34396/1/MariottiV_Marine_producti_2012.pdf |
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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