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.

从极地粒雪（firn）中采集的空气，可用于重建过去几十年的大气成分、理解冰盖中空气的捕获过程，以及确定同一深度下空气相对于冰层的年龄。本文报道了东南极洲毛德皇后地（Dronning Maud Land）H128和NDFN站点的粒雪空气组成。两个站点的粒雪空气均采用国立极地研究所（National Institute of Polar Research）研发的采样系统进行精细采集。我们提供了两个站点N₂、O₂、Ar、Kr、Xe及Ne的元素及同位素比值，以及CO₂、CH₄、N₂O、SF₆和CFCs的浓度数据，这些数据由多个实验室通过高精度测量系统测得。该数据集对于研究粒雪中的空气捕获过程、重建历史冰盖环境及大气成分具有重要价值。