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| Titel |
Modeling the recent changes of CO2 sink in the Arctic Ocean |
| VerfasserIn |
Manfredi Manizza, Michael J. Follows, Stephanie Dutkiewicz |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250057764
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| Zusammenfassung |
| The Arctic Ocean has been showing clear signs of response to anthropogenic climate change
because of the area of its sea-ice cover (SIC) rapidly declining with two spectacular events of
reduction in 2005 and 2007. Large variations in SIC would potentially impact the rate of
uptake of carbon dioxide (CO2) because SIC is the main factor controlling both the biological
production of in pelagic ecosystem and the amount of ocean area available for air-sea gas
exchange. The paucity of observational data in the Arctic Ocean makes highly uncertain the
estimates of CO2 uptake that varies between 20 and 200 TgC yr-1. In order to fill this gap,
we use an ocean physical-biogeochemical model configured for the Arctic region that we
force with re-analyzed atmospheric state (NCEP) for the period 1992-2007. The ocean
physical model is also coupled to a dynamic/thermodynamical sea-ice model. The
biogeochemical model is based on five oceanic tracers : total alkalinity, dissolved inorganic
carbon, dissolved organic phosphorus, dissolved oxygen and dissolved inorganic
phosphorus. The model also implements an additional sixth tracer, the dissolved organic
carbon of terrestrial origin linked to the river discharge explicitly represented in this
model given the importance of the riverine carbon for the ocean carbon fluxes in
this region. By using this model, we aim to quantify the interannual changes in
CO2 uptake responding not only to SIC variability but also to all the processes
associated with climate warming of this polar region. Special emphasis will be
given to the changes of shelf seas where most of the Arctic Ocean CO2 sink occurs. |
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