Fig. 5: Air-sea CO2 fluxes for the Southern Ocean. | Communications Earth & Environment

Fig. 5: Air-sea CO2 fluxes for the Southern Ocean.

From: Improved winter data coverage of the Southern Ocean CO2 sink from extrapolation of summertime observations

Fig. 5

a 2000–2017 mean seasonal cycle and b annual mean air-sea CO2 fluxes (negative into the ocean) for the Southern Ocean south of 35°S based on sea surface fCO2 from the SOM-FFN with and without pseudo observations. Values are Petagrams of carbon per year (Pg C yr−1). Each line represents an ensemble mean, and the shaded area is the 1-σ uncertainty on the SOM-FFN result with pseudo observations (see Methods). Also plotted are the same quantities derived from an atmospheric inversion using two different priors (dashed lines; see Methods section). Note that unlike Fig. 3, the mean seasonal cycle is plotted for a shorter time period, for consistency with the atmospheric inversions.

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