Simulating the atmospheric CO 2 concentration across the heterogeneous landscape of Denmark using a coupled atmosphere–biosphere mesoscale model system

摘要: Abstract. Although coastal regions only amount to 7 % of the global oceans, their contribution oceanic air–sea CO2 exchange is proportionally larger, with fluxes in some estuaries being similar in magnitude terrestrial surface . Across a heterogeneous consisting marginal sea with estuarine properties and varied land mosaics, of from both marine areas surfaces were investigated in this study together their impact atmospheric concentrations by usage high-resolution modelling framework. The simulated across region Denmark experienced an east–west gradient corresponding distribution cover classification, biological activity urbanised areas. Annually, the Danish had an uptake approximately −7000  GgC yr −1 While North Sea the Danish inner waters smaller annually, about −1800 and 1300 GgC yr , sizes are comparable annual fluxes from individual cover classifications hence not negligible. The contribution was easily detectable simulated measured concentrations atmospheric at tall tower site region. Although, the tower is positioned next Roskilde Fjord, local not distinguishable concentrations. But regional from the Baltic increased atmospheric concentration up 0.5 ppm during winter months.