Air-sea CO2 exchange of beach and near-coastal waters of the Chukchi Sea near Barrow, Alaska

► pCO2 was continuously measured with high temporal resolutions for the Arctic coastal sea. ► pCO2 was highly biologically controlled in the presence of landfast ice sheets. ► Low pCO2 in the presence of ice sheets also attributed to relatively CO2 free water melted from ice sheets. ► The study suggests an important role of sea ice in carbon cycle at high northern latitude.