A re-evaluation of the coherence between global-average atmospheric CO2 and temperatures at interannual time scales

Details A re-evaluation of the coherence between global-average atmospheric CO2 and temperatures at interannual time scales A re-evaluation of the coherence between global-average atmospheric CO2 and temperatures at interannual time scales

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3622704p&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 22, CiteID L22704

Physics

Geophysics

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Biogeosciences: Carbon Cycling (4806), Mathematical Geophysics: Time Series Analysis (1872, 1988, 4277, 4475), Paleoceanography: Greenhouse Gases

Scientific paper

Frequency-dependent coherence between atmospheric CO2 and historical temperatures reveals climate feedbacks within Earth's carbon cycle. Coherence between interannual fluctuations in global-average temperature and atmospheric CO2 has changed over time. Since 1979, at Mauna Loa and other observation sites, interannual coherence exhibits a 90° phase lag that suggests a direct correlation between temperatures and the time-derivative of CO2. The coherence transition can be explained if the response time of CO2 to a global temperature fluctuation has lengthened from 6 months to at least 15 months. A longer response time may reflect saturation of the oceanic carbon sink, but a transient shift in ocean circulation may play a role. Coherent annual-cycle fluctuations in CO2 and temperature are evident in the 1958-1988 time series, but not since 1979. Coherence of interannual CO2 variations with gridpoint temperature anomalies are strongest in the tropical oceans.

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