Elemental and isotopic compositions of N2, O2, and noble gases, and concentrations of greenhouse gases and halocarbons in firn air at H128 and NDFN, Dronning Maud Land, East Antarctica

Air sampled from the polar firn are useful for reconstructing atmospheric composition over the last few decades and understanding the trapping processes of air in the ice sheets, as well as determining the age of air relative to the ice at the same depth. This paper presents the composition of firn air at H128 and NDFN in Dronning Maud Land, East Antarctica. The firn air at both sites were carefully sampled using a sampling system developed at National Institute of Polar Research. We provide elemental and isotopic ratios of N2, O2, Ar, Kr, Xe, and Ne, as well as concentrations of CO2, CH4, N2O, SF6 and CFCs for both sites, measured by high-precision measurement systems at multiple laboratories. The data would be valuable for studying air entrapment processes in firn and reconstructing past ice sheet environments and atmospheric compositions.