Biological productivity in the Mauritanian upwelling estimated with a triple gas approach

Steinhoff, Tobias, Bange, Hermann W., Kock, Annette, Wallace, Douglas W.R. and Körtzinger, Arne (2012) Biological productivity in the Mauritanian upwelling estimated with a triple gas approach Biogeosciences Discussions, 9 (4). pp. 4853-4875. DOI 10.5194/bgd-9-4853-2012.

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Due to their high biological productivity coastal upwelling regions are important for biogeochemical cycles in the ocean and for fisheries. Upwelled water is not only enriched in nutrients but also supersaturated with respect to atmospheric CO2 and N2O and undersaturated for O2. We present a novel approach to estimate carbon based net community production (NCP) using surface ocean data for CO2, O2 and N2O from three cruises to the Mauritanian upwelling region (Northwest Africa) that were conducted in different seasons. Through combination of the saturation patterns of CO2, O2 and N2O effects of air–sea gas exchange and NCP could be separated. NCP values ranges from 0.6 ± 0.1g C m−2 d−1 during times of weak upwelling to 1.6 ± 0.4 g C m−2 d−1 during strong upwelling. The estimated NCP values show a strong relationship with a wind derived upwelling index, which was used to estimate annual NCP.

Document Type: Article
Additional Information: A revision of this discussion paper for further review has not been submitted.
Keywords: POSEIDON; POS399/2; POS399/3; POS320/1
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: No
DOI etc.: 10.5194/bgd-9-4853-2012
ISSN: 1810-6285
Projects: SOPRAN, Future Ocean
Date Deposited: 10 Dec 2012 14:32
Last Modified: 29 May 2017 09:49

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