A conceptual model for the temporal spectrum of oceanic oxygen variability

Taka Ito, Curtis Deutsch

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Changes in dissolved O2 observed across the world oceans in recent decades have been interpreted as a response of marine biogeochemistry to climate change. Little is known however about the spectrum of oceanic O 2 variability. Using an idealized model, we illustrate how fluctuations in ocean circulation and biological respiration lead to low-frequency variability of thermocline oxygen. Because the ventilation of the thermocline naturally integrates the effects of anomalous respiration and advection over decadal timescales, short-lived O2 perturbations are strongly damped, producing a red spectrum, even in a randomly varying oceanic environment. This background red spectrum of O2 suggests a new interpretation of the ubiquitous strength of decadal oxygen variability and provides a null hypothesis for the detection of climate change influence on oceanic oxygen. We find a statistically significant spectral peak at a 15-20 year timescale in the subpolar North Pacific, but the mechanisms connecting to climate variability remain uncertain.

Original languageEnglish (US)
Article numberL03601
JournalGeophysical Research Letters
Volume37
Issue number3
DOIs
StatePublished - Feb 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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