Snow height on sea ice and sea ice drift from autonomous measurements from buoy 2017S51, deployed during PAMARCMIP 2017

Snow height was measured by the Snow Depth Buoy 2017S51, an autonomous platform, installed on land-fast sea ice during PAMARCMIP 2017. The resulting time series describes the evolution of snow depth as a function of place and time between 25 Mar 2017 and 17 Apr 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. 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.

雪深数据由2017S51型雪深浮标（Snow Depth Buoy 2017S51）采集，该自主观测平台部署于PAMARCMIP 2017科考期间的固定海冰之上。所得到的时间序列刻画了2017年3月25日至2017年4月17日期间，雪深随空间位置与时间的演化规律，采样间隔为1小时。该雪深浮标搭载四组独立声呐测量单元，覆盖浮标周边约10平方米的观测区域。除雪深参数外，该系统还同步采集了地理定位（GPS）、大气压强、空气温度以及冰内温度等观测数据。当海冰表面消融持续进行时，会出现雪高负值，此类测量值表征的是海冰表面相对于初始雪冰界面的相对位置。各传感器间的测量差值可反映浮标周边积雪覆盖层的小尺度空间变异性。本数据集已完成预处理流程，包括剔除明显的不一致数据（缺失值）。即便未获取有效雪深数据，对应的记录仍可用于海冰漂移分析。