C:N ratios in the mixed layer during the productive season in the Northeast Atlantic Ocean

Körtzinger, Arne, Koeve, Wolfgang, Kähler, Paul and Mintrop, Ludger (2001) C:N ratios in the mixed layer during the productive season in the Northeast Atlantic Ocean Deep-Sea Research Part I-Oceanographic Research Papers, 48 . pp. 661-688. DOI 10.1016/S0967-0637(00)00051-0.

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Redfield stoichiometry has proved a robust paradigm for the understanding of biological production and export in the ocean on a long-term and a large-scale basis. However, deviations of carbon and nitrogen uptake ratios from the Redfield ratio have been reported. A comprehensive data set including all carbon and nitrogen pools relevant to biological production in the surface ocean (DIC, DIN, DOC, DON, POC, PON) was used to calculate seasonal new production based on carbon and nitrogen uptake in summer along 20°W in the northeast Atlantic Ocean. The 20°W transect between 30 and 60°N covers different trophic states and seasonal stages of the productive surface layer, including early bloom, bloom, post-bloom and non-bloom situations. The spatial pattern has elements of a seasonal progression. We also calculated exported production, i.e., that part of seasonal new production not accumulated in particulate and dissolved pools, again separately for carbon and nitrogen. The pairs of estimates of `seasonal new production’ and `exported production’ allowed us to calculate the C : N ratios of these quantities. While suspended particulate matter in the mixed layer largely conforms to Redfield stoichiometry, marked deviations were observed in carbon and nitrogen uptake and export with progressing season or nutrient depletion. The spring system was characterized by nitrogen overconsumption and the oligotrophic summer system by a marked carbon overconsumption. The C : N ratios of seasonal new as well as exported production increase from early bloom values of 5–6 to values of 10–16 in the post-bloom/oligotrophic system. The summertime accumulation of nitrogen-poor dissolved organic matter can explain only part of this shift.

Document Type: Article
Keywords: DIC; Dissolved organic carbon; Dissolved organic nitrogen; Particulate organic matter; Redfield ratio; New production; Export production; North Atlantic Ocean
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > GEOMAR > FB2 Marine Biogeochemistry
Refereed: Yes
DOI etc.: 10.1016/S0967-0637(00)00051-0
ISSN: 0967-0637
Date Deposited: 26 Jan 2009 11:16
Last Modified: 28 Oct 2016 07:54
URI: http://eprints.uni-kiel.de/id/eprint/5215

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