Jones, Steve D; Le Quéré, Corinne; Rödenbeck, Christian (2014): Spatial decorrelation lengths of surface ocean fCO2 results in NetCDF format [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.836388,

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Supplement to: Jones, SD et al. (2012): Autocorrelation characteristics of surface ocean pCO2 and air-sea CO2 fluxes. Global Biogeochemical Cycles, 26(2), GB2042, https://doi.org/10.1029/2010GB004017

Understanding the variability and coherence of surface ocean pCO2 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 pCO2on 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 ± 250 km, with large variability across different regions. Autocorrelation lengths of up to 3,000 km are found along major currents and basin gyres while autocorrelation lengths as low as 50 km 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 forpCO2 (200 ± 150 km) due to the high variability of the gas transfer velocity.

We calculate the spatial autocorrelation characteristics of surface ocean fCO2 using data from the Surface Ocean CO2 Atlas (SOCAT). The results are presented as gridded spatial decorrelation lengths: for each grid cell, we show the distance at which the spatial correlation from that cell drops below the e-folding threshold (1/e). Decorrelation lengths are presented for four directions: north to south, east to west, south-east to north-west, and south-west to north-east. An additional omni-directional measure of spatial decorrelation length is also included.