Thickness and properties of sea ice and snow of land-fast sea ice in Atka Bay in 2020

Manual measurements of sea ice thickness, sub-ice platelet layer thickness, freeboard, and snow thickness are distributed evenly and repeated along a 25km-long transect across Atka Bay every 2 to 4 weeks. At each measurement location, 5 holes were drilled through the ice in order to determine the aforementioned parameters, one in the center and one in a distance of five meters in each direction, to cover their small-scale spatial variabilities. The measurements have been mainly conducted by the meteorologist (Anna-Marie Jörss) and Klaus Guba, Ina Wehner, Julia Loftfield, Noah Trumpik, Roman Ackle, Wanderson Divino de Almeida Santos of the overwintering team.每2至4周，研究人员会在横跨阿特卡湾（Atka Bay）的25千米长样带上均匀布设测点并重复开展人工测量，测量参数涵盖海冰厚度、冰下冰屑层（sub-ice platelet layer）厚度、冰面干舷（freeboard）以及积雪厚度。在每个测量测点处，科研人员会在冰面钻取5个钻孔以测定上述参数：1个位于测点中心，其余4个分别沿四个方向距中心5米处布设，以此覆盖参数的小尺度空间变异性。本次测量主要由气象学家安娜-玛丽·约尔斯（Anna-Marie Jörss）以及越冬科考队的克劳斯·古巴、伊娜·韦纳、朱莉娅·洛夫特菲尔德、诺亚·特朗普克、罗曼·阿克勒、万德森·迪维诺·德·阿尔梅达·桑托斯共同完成。