Autocorrelation characteristics of surface ocean pCO and air-sea CO fluxes

S.D. Jones, C. Le Quéré, C. Rödenbeck

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Understanding the variability and coherence of surface ocean pCO on a global scale can provide insights into its physical and biogeochemical drivers and inform future samplings strategies and data assimilation methods. We present temporal and spatial autocorrelation analyses of surface ocean pCO on a 5 × 5 grid using the Lamont-Doherty Earth Observatory database. The seasonal cycle is robust with an interannual autocorrelation of ∼0.4 across multiple years. The global median spatial autocorrelation (e-folding) length is 400 250km, with large variability across different regions. Autocorrelation lengths of up to 3,000km are found along major currents and basin gyres while autocorrelation lengths as low as 50km are found in coastal regions and other areas of physical turbulence. Zonal (east-west) autocorrelation lengths are typically longer than their meridional counterparts, reflecting the zonal nature of many major ocean features. Uncertainties in spatial autocorrelation in different ocean basins are between 42% and 73% of the calculated decorrelation length. The spatial autocorrelation length in air-sea fluxes is much shorter than for pCO (200 150km) due to the high variability of the gas transfer velocity.
Original languageEnglish
JournalGlobal Biogeochemical Cycles
Issue number2
Publication statusPublished - 1 Jan 2012

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