Physical Controls on Oxygen Distribution and Denitrification Potential in the North West Arabian Sea

Queste, Bastien Y., Vic, Clément, Heywood, Karen J. and Piontkovski, Sergey A. (2018) Physical Controls on Oxygen Distribution and Denitrification Potential in the North West Arabian Sea. Geophysical Research Letters, 45 (9). pp. 4143-4152. ISSN 0094-8276

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    Abstract

    At suboxic oxygen concentrations, key biogeochemical cycles change and denitrification becomes the dominant remineralization pathway. Earth system models predict oxygen loss across most ocean basins in the next century; oxygen minimum zones near suboxia may become suboxic and therefore denitrifying. Using an ocean glider survey and historical data, we show oxygen loss in the Gulf of Oman (from 6–12 to <2 μmol/kg−1) not represented in climatologies. Because of the nonlinearity between denitrification and oxygen concentration, resolutions of current Earth system models are too coarse to accurately estimate denitrification. We develop a novel physical proxy for oxygen from the glider data and use a high‐resolution physical model to show eddy stirring of oxygen across the Gulf of Oman. We use the model to investigate spatial and seasonal differences in the ratio of oxic and suboxic water across the Gulf of Oman and waters exported to the wider Arabian Sea.

    Item Type: Article
    Uncontrolled Keywords: deoxygenation,oman,glider,arabian sea,denitrifcation,eddies
    Faculty \ School: Faculty of Science > School of Environmental Sciences
    Related URLs:
    Depositing User: Pure Connector
    Date Deposited: 21 May 2018 13:30
    Last Modified: 25 Jul 2018 14:54
    URI: https://ueaeprints.uea.ac.uk/id/eprint/67143
    DOI: 10.1029/2017GL076666

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