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. We estimated monthly air–sea CO2 fluxes in the Arctic Ocean andits adjacent seas north of 60 ∘  N from 1997 to 2014. This was done bymapping partial pressure of CO2 in the surface water ( p CO2w )using a self-organizing map (SOM) technique incorporating chlorophyll  a concentration (Chl  a ), sea surface temperature, sea surface salinity, seaice concentration, atmospheric CO2 mixing ratio, and geographicalposition. We applied new algorithms for extracting Chl  a from satelliteremote sensing reflectance with close examination of uncertainty of theobtained Chl  a values. The overall relationship between p CO2w andChl  a was negative, whereas the relationship varied among seasons andregions. The addition of Chl  a as a parameter in the SOM process enabled usto improve the estimate of p CO2w , particularly via betterrepresentation of its decline in spring, which resulted from biologicallymediated p CO2w reduction. As a result of the inclusion of Chl  a , theuncertainty in the CO2 flux estimate was reduced, with a net annualArctic Ocean CO2 uptake of 180  ±  130  Tg C yr−1 . Seasonal tointerannual variation in the CO2 influx was also calculated.

biogeosciences

Arctic Ocean CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; uptake: an improved multiyear estimate of the air–sea CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; flux incorporating chlorophyll &amp;lt;i&amp;gt;a&amp;lt;/i&amp;gt; concentrations