Mechanisms controlling the air-sea CO2 flux in the North Sea.

Prowe, Friederike , Thomas, H., Pätsch, J., Kühn, W., Bozec, Y., Schiettecatte, L. S., Borges, A. V. and de Baar, H. J. W. (2009) Mechanisms controlling the air-sea CO2 flux in the North Sea. Continental Shelf Research, 29 (15). pp. 1801-1808. DOI 10.1016/j.csr.2009.06.003.

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Abstract

The mechanisms driving the air–sea exchange of carbon dioxide (CO2CO2) in the North Sea are investigated using the three-dimensional coupled physical–biogeochemical model ECOHAM (ECOlogical-model, HAMburg). We validate our simulations using field data for the years 2001–2002 and identify the controls of the air–sea CO2CO2 flux for two locations representative for the North Sea's biogeochemical provinces. In the seasonally stratified northern region, net CO2CO2 uptake is high (View the MathML source2.06molm-2a-1) due to high net community production (NCP) in the surface water. Overflow production releasing semi-labile dissolved organic carbon needs to be considered for a realistic simulation of the low dissolved inorganic carbon (DIC) concentrations observed during summer. This biologically driven carbon drawdown outcompetes the temperature-driven rise in CO2CO2 partial pressure (pCO2pCO2) during the productive season. In contrast, the permanently mixed southern region is a weak net CO2CO2 source (View the MathML source0.78molm-2a-1). NCP is generally low except for the spring bloom because remineralization parallels primary production. Here, the pCO2pCO2 appears to be controlled by temperature.

Document Type: Article
Keywords: CO2; air-sea CO2 flux, continental shelf pump, biogeochemical modelling, ECOHAM, North Sea
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.csr.2009.06.003
ISSN: 0278-4343
Projects: CARBOOCEAN, LOICZ, COCOS, Future Ocean
Date Deposited: 04 Sep 2009 10:25
Last Modified: 21 Sep 2016 07:41
URI: http://oceanrep.geomar.de/id/eprint/6370

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