The air-water CO2 exchange of a coastal sea—A sensitivity study on factors that influence the absorption and outgassing of CO2 in the Baltic Sea

摘要: In this study, the BALTSEM model is used to estimate how air-water CO2 fluxes in Baltic Sea respond parameterizations of organic alkalinity (Aorg), gas transfer, and phytoplankton growth, further changes river loads. The forcing data include most complete compilation loads for dissolved inorganic carbon (DIC DOC) total (TA). addition, we apply recent estimates internal TA generation system. Our results clearly demonstrate a coastal sea depend on carbon, TA, nutrients as well freshwater import itself. Long-term DIC are shown be compensated by corresponding exchange. By adding Aorg, discrepancy carbonate system calculations was removed, simulated net absorption decreased 11%. A new parameterization cyanobacteria growth significantly improved seasonal development pCO2 central Sea, although effect below 5%. applying either linear, quadratic, or cubic wind speed dependence long-term exchange adjusted less than There no clear indication that any one these provides more accurate other two. findings applicable areas heavily influenced DIC, DOC.