Snow height on sea ice and sea ice drift from autonomous measurements from buoy 2016S38, deployed during POLARSTERN cruise PS96 (ANT-XXXI/2)

Snow height was measured by the Snow Depth Buoy 2016S38, an autonomous platform, drifting on Antarctic sea ice, during POLARSTERN cruise ANT-XXXI/2 (PS96). The resulting time series describes the evolution of snow depth as a function of place and time between 15 Jan 2016 and 08 May 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.

本数据集的雪深观测由2016S38型雪深浮标（Snow Depth Buoy）完成，该浮标为自主观测平台，随南极海冰漂移，观测时段覆盖极星号（POLARSTERN）科考航次ANT-XXXI/2（编号PS96）期间。所得时间序列记录了2016年1月15日至2017年5月8日期间，雪深随空间与时间的演化过程，采样间隔为1小时。该雪深浮标搭载4套独立声呐传感器，可覆盖浮标周边约10平方米的观测区域。浮标部署于多年冰之上。除雪深外，该浮标还同步观测了地理定位（GPS）、大气压强、气温以及浮标内部的冰温。当表面消融持续延伸至海冰内部时，雪深观测值会出现负值；此类观测值实际表征的是海冰表面相对于初始雪冰界面的位置。各传感器间的观测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，包括剔除明显异常值（缺失值）。无有效雪深数据的观测记录，仍可用于海冰漂移轨迹分析。