[AOS16-P02] Multi-year estimate of the air-sea CO2 flux in the Arctic with the use of the chlorophyll-a concentration
Keywords:CO2 flux, Arctic, chlorophyll-a, SOCAT
We estimated monthly air–sea CO2 flux in the Arctic north of 60°N from 1997 to 2014 by applying a self-organizing map technique with Chl-a, SST, SSS, SIC, xCO2a, and geographical positions. The addition of Chl-a as a training parameter enables us to improve the estimate of pCO2w through reproducing its decline in spring by biological production. A significant CO2 uptake of 180 ± 130 TgC yr–1 in the Arctic Ocean was obtained. This estimate has been much improved compared to a previous estimate thanks to the use of Chl-a, but to some extent also due to a higher number of CO2 data.