Mean annual cycle of the air-Sea oxygen flux: A global view

Raymond Gabriel Najjar, Jr., Ralph F. Keeling

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

A global monthly-mean climatology of the air-sea oxygen flux is presented and discussed. The climatology is based on the ocean oxygen climatology of Najjar and Keeling [1997] and wind speeds derived from a meteorological analysis center. Seasonal variations are characterized by outgassing of oxygen during spring and summer and ingassing of oxygen during fall and winter, a pattern consistent with thermal and biological forcing of the air-sea oxygen flux. The annual mean flux pattern is characterized by ingassing at high latitudes and the tropics and outgassing in middle latitudes. The air-sea oxygen flux is shown to exhibit patterns that agree well with patterns seen in a marine primary productivity climatology, in model generated air-sea Oz fluxes, in estimates of remineralization in the shallow aphotic zone based on seasonal oxygen variations, in observed seasonal nutrient-temperature relationships, and in independent estimates of meridional oxygen transport in the Atlantic ocean. We also find that extratropical mixed layer new production during the spring-summer period, computed from biological seasonal net outgassing of oxygen, is equivalent to the production of 4.5-5.6 Gt C, much lower than previous estimates based on atmospheric O2/N2 measurements.

Original languageEnglish (US)
Pages (from-to)573-584
Number of pages12
JournalGlobal Biogeochemical Cycles
Volume14
Issue number2
DOIs
StatePublished - Jun 1 2000

Fingerprint

annual cycle
Oxygen
Fluxes
oxygen
Climatology
air
Air
climatology
Degassing
sea
Tropics
remineralization
ocean
summer
Nutrients
mixed layer
seasonal variation
wind velocity
Productivity
productivity

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Environmental Chemistry
  • Environmental Science(all)
  • Atmospheric Science

Cite this

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Mean annual cycle of the air-Sea oxygen flux : A global view. / Najjar, Jr., Raymond Gabriel; Keeling, Ralph F.

In: Global Biogeochemical Cycles, Vol. 14, No. 2, 01.06.2000, p. 573-584.

Research output: Contribution to journalArticle

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