Modeling abiotic production of apparent oxygen utilisation in the oligotrophic subtropical North Atlantic.

Dietze, Heiner and Oschlies, Andreas (2005) Modeling abiotic production of apparent oxygen utilisation in the oligotrophic subtropical North Atlantic. Ocean Dynamics, 55 (1). pp. 28-33. DOI 10.1007/s10236-005-0109-z.

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Abstract

Apparent oxygen utilisation is potentially biased by abiotic, physical processes. Using a coupled 3-D circulation-oxygen model, this potential is quantitatively estimated for a region in the eastern subtropical North Atlantic, called the Beta Triangle, where an inconsistency exists between observational estimates of high carbon export from the euphotic zone, based on oxygen utilisation rates in the thermocline (Jenkins 1982), and those of low nutrient supply to the euphotic zone (Lewis et al. 1986, 2004). Our results indicate that in the upper ocean, the Jenkins (1982) estimate is indeed biased high by approximately 10% due to abiotic processes feigning respiration, thus contributing to the apparent inconsistency. Vertical integration, however, yields an abiotic fraction of less than 3%, so the apparent observational discrepancy can not be resolved.

Document Type: Article
Keywords: abiotic production, oxygen utilisation, oligotrophic, North Atlantic
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10236-005-0109-z
ISSN: 1616-7341
Date Deposited: 03 Dec 2008 16:51
Last Modified: 06 Feb 2017 14:18
URI: http://oceanrep.geomar.de/id/eprint/7000

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