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 Biogeosciences (BG), 10 (11). pp. 7723-7738. DOI 10.5194/bg-10-7723-2013.

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Abstract

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 > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754
OceanRep > SFB 754 > A2
Refereed: Yes
DOI etc.: 10.5194/bg-10-7723-2013
ISSN: 1726-4170
Related URLs:
Projects: BIOACID, SFB754
Date Deposited: 06 Dec 2013 10:25
Last Modified: 12 Jan 2015 12:17
URI: http://oceanrep.geomar.de/id/eprint/22511

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