Annual surface flow velocity on Qaanaaq ice cap, Greenland in 2015-2016

The surface motion of the glacier was measured by surveying 6 stakes (1.5-2.0 m long aluminium poles) installed in the ice of Qaanaaq ice cap. Dual-frequency GPS receivers and antennas (GNSS GEM-1) were used to measure the three-dimensional positions of the stakes. One antenna was fixed on the roof of Qaanaaq Club House as a reference station. At Q1501-Q1506, the antennae were mounted on the stakes and operated for 30 minutes in July 2015 and July 2016. These data were processed in static mode by the GPS software (RTKLIB) to compute the position of the stakes every 30 minutes. Measurement errors were estimated below 10 mm.本数据集通过对安装于卡纳克冰盖（Qaanaaq Ice Cap）冰层内的6根测桩（长1.5~2.0米的铝制标杆）开展测量，获取冰川表面运动相关数据。研究采用双频GPS接收机与天线（GNSS GEM-1）测定各测桩的三维空间位置。其中一根天线固定于卡纳克俱乐部（Qaanaaq Club House）屋顶，作为基准站。针对编号为Q1501至Q1506的测桩，天线被安装于测杆之上，并分别于2015年7月与2016年7月完成了时长30分钟的观测。上述数据通过GPS解算软件（RTKLIB）以静态模式进行处理，每30分钟解算一次测桩的位置坐标。经估算，本次测量的误差低于10毫米。