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

Bastien Y. Queste, Clément Vic, Karen J. Heywood, Sergey A. Piontkovski

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish
JournalGeophysical Research Letters
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Arabian Sea
denitrification
oxygen
Oman
gulfs
gliders
oceans
telluric currents
remineralization
biogeochemical cycle
stirring
ocean basin
distribution
sea
nonlinearity
water
eddy
vortices
cycles
high resolution

Keywords

  • Arabian sea
  • Denitrifcation
  • Deoxygenation
  • Eddies
  • Glider
  • Oman

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Physical Controls on Oxygen Distribution and Denitrification Potential in the North West Arabian Sea. / Queste, Bastien Y.; Vic, Clément; Heywood, Karen J.; Piontkovski, Sergey A.

In: Geophysical Research Letters, 01.01.2018.

Research output: Contribution to journalArticle

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N2 - 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.

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