A modeling study of the seasonal oxygen budget of the global ocean

X. Jin, R. G. Najjar, F. Louanchi, Scott C. Doney

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

An ecosystem model embedded in a global ocean general circulation model is used to quantify roles of biological and physical processes on seasonal oxygen variations. We find that the thermally induced seasonal net outgassing (SNO) of oxygen is overestimated by about 30% if gas phase equilibrium is assumed, and we find that seasonal variations in thermocline oxygen due to biology are approximated well using the oxygen anomaly. Outside the tropics and the north Indian Ocean, biological SNO is, on average, 56% of net community production (defined as net oxygen production above 76 m) during the outgassing period and 35% of annual net community production. In the same region the seasonal drawdown of the oxygen anomaly within the upper thermocline (76-500 m) is 76% of the remineralization during the drawdown and 48% of annual remineralization. Applying model-derived relationships to observed O2 climatologies and using independent estimates for tropical and monsoonal systems, we estimate global net community production to be 14.9 ± 2.5 Pg C yr-1.

Original languageEnglish (US)
Article numberC05017
JournalJournal of Geophysical Research: Oceans
Volume112
Issue number5
DOIs
StatePublished - May 8 2007

Fingerprint

global budgets
global ocean
budgets
oceans
outgassing
Oxygen
oxygen
Degassing
thermoclines
drawdown
modeling
remineralization
thermocline
anomalies
oxygen production
Temperature distribution
General Circulation Models
Indian Ocean
anomaly
ecosystems

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

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abstract = "An ecosystem model embedded in a global ocean general circulation model is used to quantify roles of biological and physical processes on seasonal oxygen variations. We find that the thermally induced seasonal net outgassing (SNO) of oxygen is overestimated by about 30{\%} if gas phase equilibrium is assumed, and we find that seasonal variations in thermocline oxygen due to biology are approximated well using the oxygen anomaly. Outside the tropics and the north Indian Ocean, biological SNO is, on average, 56{\%} of net community production (defined as net oxygen production above 76 m) during the outgassing period and 35{\%} of annual net community production. In the same region the seasonal drawdown of the oxygen anomaly within the upper thermocline (76-500 m) is 76{\%} of the remineralization during the drawdown and 48{\%} of annual remineralization. Applying model-derived relationships to observed O2 climatologies and using independent estimates for tropical and monsoonal systems, we estimate global net community production to be 14.9 ± 2.5 Pg C yr-1.",
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A modeling study of the seasonal oxygen budget of the global ocean. / Jin, X.; Najjar, R. G.; Louanchi, F.; Doney, Scott C.

In: Journal of Geophysical Research: Oceans, Vol. 112, No. 5, C05017, 08.05.2007.

Research output: Contribution to journalArticle

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AU - Jin, X.

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AU - Louanchi, F.

AU - Doney, Scott C.

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AB - An ecosystem model embedded in a global ocean general circulation model is used to quantify roles of biological and physical processes on seasonal oxygen variations. We find that the thermally induced seasonal net outgassing (SNO) of oxygen is overestimated by about 30% if gas phase equilibrium is assumed, and we find that seasonal variations in thermocline oxygen due to biology are approximated well using the oxygen anomaly. Outside the tropics and the north Indian Ocean, biological SNO is, on average, 56% of net community production (defined as net oxygen production above 76 m) during the outgassing period and 35% of annual net community production. In the same region the seasonal drawdown of the oxygen anomaly within the upper thermocline (76-500 m) is 76% of the remineralization during the drawdown and 48% of annual remineralization. Applying model-derived relationships to observed O2 climatologies and using independent estimates for tropical and monsoonal systems, we estimate global net community production to be 14.9 ± 2.5 Pg C yr-1.

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