A novel estimate of ocean oxygen utilisation points to a reduced rate of respiration in the ocean interior.

Duteil, Olaf , Koeve, Wolfgang , Oschlies, Andreas , Bianchi, D., Galbraith, E., Kriest, Iris and Matear, R. (2013) A novel estimate of ocean oxygen utilisation points to a reduced rate of respiration in the ocean interior. Open Access Biogeosciences (BG), 10 (11). pp. 7723-7738. DOI 10.5194/bg-10-7723-2013.

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The Apparent Oxygen Utilisation (AOU) is a classical measure of the amount of oxygen respired in the ocean's interior. We show that AOU systematically overestimates True Oxygen Utilisation (TOU) in 6 coupled circulation-biogeochemical ocean models. This is due to atmosphere–ocean oxygen disequilibria in the subduction regions, consistent with previous work. We develop a simple, new, observationally-based approach which we call Evaluated Oxygen Utilisation (EOU). In this approach, we take into account the impact of the upper ocean oxygen disequilibria into the interior, considering that transport takes place predominantly along isopycnal surfaces. The EOU approximates the TOU with less than half of the bias of AOU in all 6 models despite large differences in the physical and biological components of the models. Applying the EOU approach to a global observational dataset yields an oxygen consumption rate 25% lower than that derived from AOU-based estimates, for a given ventilation rate.

Document Type: Article
Keywords: oxygen utilisation, preformed nutrients, biogeochemical models
Research affiliation: OceanRep > SFB 754
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754 > A2
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-10-7723-2013
ISSN: 1726-4189
Related URLs:
Projects: BIOACID, SFB754, Future Ocean, Opendap
Date Deposited: 06 Dec 2013 10:25
Last Modified: 23 Sep 2019 20:30
URI: http://oceanrep.geomar.de/id/eprint/22511

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