Snow height on sea ice and sea ice drift from autonomous measurements from buoy 2018S56, deployed for Antarctic Fast Ice Network (AFIN) 2018

Snow height was measured by the Snow Depth Buoy 2018S56, an autonomous platform, drifting on Antarctic sea ice, deployed for the Antarctic Fast Ice Network (AFIN) 2018 at Atka Bay. The resulting time series describes the evolution of snow depth as a function of place and time between 14 June 2018 and 24 January 2020 in sample intervals of 1 hour. The Snow Depth Buoy consists of four independent sonar measurements representing the area (approx. 10 m**2) around the buoy. The buoy was installed on fast ice. In addition to snow depth, geographic position (GPS), barometric pressure, air temperature, and an internal ice temperature were measured. Negative values of snow height occur if surface ablation continues into the sea ice. Thus, these measurements describe the position of the sea ice surface relative to the original snow-ice interface. Differences between single sensors indicate small-scale variability of the snow pack around the buoy. The data set has been processed, including the removal of obvious inconsistencies (missing values). Records without any snow depth may still be used for sea ice drift analyses.

本数据集的雪深观测数据由2018S56号雪深浮标（Snow Depth Buoy）采集。该浮标为自主观测平台，于南极海冰上随冰漂流，是2018年为南极固定冰网络（Antarctic Fast Ice Network, AFIN）部署于阿特卡湾的观测设备。所得到的时间序列记录了2018年6月14日至2020年1月24日期间，雪深随空间与时间的演化过程，采样间隔为1小时。该雪深浮标配备4套独立声呐测量单元，可覆盖浮标周边约10平方米的观测区域。浮标部署于固定冰之上，除雪深外，还同步采集地理定位（GPS）、气压、气温以及浮冰冰内温度等观测数据。当表面消融持续延伸至海冰内部时，会出现雪深负值，此时的测量值表征的是海冰表面相对于初始雪冰界面的位置。各传感器间的测量差值可反映浮标周边积雪层的小尺度空间变异性。本数据集已完成预处理，包括剔除明显的异常与缺失值。即便未获取有效雪深数据的记录，仍可用于海冰漂流分析。