Beryllium-7 concentrations in aerosols, seawater, ice, snow and frost flowers from Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in the Central Arctic Ocean 2019-2020

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition was an international initiative in which research vessel (R/V) Polarstern drifted with the sea ice in the Central Arctic Ocean from October 2019 to September 2020. Here, we present data from a study in which Beryllium-7, a naturally occurring radioactive isotope with a half-life of 53 days, is used as a tracer for the atmospheric deposition of trace elements to the ocean / ice surface and their partitioning among the seawater, ice and snow catchments during winter and spring. The data sets include measurements of Be-7 in 1) aerosol particles collected on filters using a high volume sampler on Polastern, 2) seawater from the upper water column (8-60 meters depth) collected using the ship’s seawater intake system and using pumps on the ice floe, and 3) ice cores, snow, and frost flowers collected from sites on the MOSAiC and surrounding ice floes. Be-7 analysis was performed using high purity germanium gamma detectors.

北极气候研究多学科漂流观测站（Multidisciplinary drifting Observatory for the Study of Arctic Climate, MOSAiC）科考行动是一项国际合作项目，研究团队依托研究船“极地号”（R/V Polarstern），于2019年10月至2020年9月间随北冰洋中心海域的海冰漂流开展科考工作。本文在此公开一项相关研究的数据集：该研究以半衰期为53天的天然放射性同位素铍-7（Beryllium-7）作为示踪剂，用于示踪痕量元素向海洋/冰面的大气沉降过程，以及冬春季节痕量元素在海水、海冰与积雪储库间的分配行为。数据集包含三类铍-7检测数据：1）利用“极地号”上的大容量采样器采集的滤膜气溶胶颗粒中的铍-7；2）通过船舶海水取水系统及浮冰泵组采集的上层水柱（水深8~60米）海水样品中的铍-7；3）从MOSAiC科考行动及周边浮冰站点采集的冰芯、积雪与霜花样品中的铍-7。所有铍-7样品的分析均采用高纯锗γ探测器完成。