Atmospheric CO2 variation over the Baltic Sea and the impact on air–sea exchange
Anna Rutgersson, Maria Norman, Gustav Åström
Abstract
The variability in time and space of the atmospheric molar fraction of CO 2 over the Baltic Sea was investigated using data from seven stations from the World Data Center for Greenhouse Gases. The variation on a monthly timescale of CO 2 was divided into a global trend, a regional anthropogenic contribution and a natural seasonal cycle. For the Baltic Sea stations the anthropogenic and terrestrial contributions were largest at the coastal sites in the southern Baltic Sea (an offset of 9 ppm), decreasing towards the north over the Baltic Sea (to about 2 ppm). When calculating the air-sea flux of CO 2 using the difference in partial pressure between air and sea, uncertainties in the atmospheric molar fraction of CO 2 were shown to be of secondary importance as compared with uncertainties in other parameters (< 10%). Realistic uncertainties in the sea surface partial pressure, wind speed or transfer velocity resulted in significantly larger uncertainties in a calculated air-sea flux.