Snow height on sea ice and sea ice drift from autonomous measurements from buoy 2016S31, deployed during POLARSTERN cruise PS96 (ANT-XXXI/2)

Snow height was measured by the Snow Depth Buoy 2016S31, an autonomous platform, drifting on Antarctic sea ice, during POLARSTERN cruise PS96 (ANT-XXXI/2). The resulting time series describes the evolution of snow depth as a function of place and time between 16 Jan 2016 and 25 Jan 2017 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 multi year ice. In addition to snow depth, geographic position (GPS), barometric pressure, air temperature, and an internal ice temperature were measured. Negative values of snow depth 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.

本数据集的雪深数据由2016S31型雪深浮标（Snow Depth Buoy 2016S31）采集，该自主观测平台随南极海冰漂流，数据获取于极星号（POLARSTERN）科考船PS96航次（ANT-XXXI/2）期间。所得到的时间序列刻画了2016年1月16日至2017年1月25日期间，雪深随空间与时间的演化规律，采样间隔为1小时。该雪深浮标搭载四组独立的声呐测量单元，覆盖浮标周边约10平方米的观测区域。浮标部署于多年海冰之上。除雪深参数外，同步采集的观测指标还包括地理位置（GPS）、大气压强、空气温度以及浮标内部的冰温。当海冰表面消融持续深入至冰体内部时，雪深测量值会出现负值，此类负值表征的是海冰表面相对于初始雪-冰界面的位置偏移。单个传感器间的读数差异，反映了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工作，包括剔除明显的不一致数据（如缺失值）。即便未记录有效雪深数据，该数据集仍可用于海冰漂流分析。