Annual surface flow velocity on Bowdoin Glacier, Greenland in 2016-2017

The surface motion of the glacier was measured by surveying 2 stakes (2.0 m long aluminium poles) installed in the ice in the lower part of Bowdoin Glacier. Dual-frequency GPS receivers and antennas (GNSS GEM-1) were used to measure the three-dimensional positions of the stakes. One antenna was fixed to solid rock on the eastern bank of the glacier as a reference station. At 1603 and B16BH1, the antennae were mounted on the stakes and operated for 30 minutes in July 2016 and July 2017. These data were processed in static mode by the GPS software (RTKLIB) to compute the position of the stakes. Measurement errors were estimated below 10 mm.研究人员于鲍登冰川（Bowdoin Glacier）下段冰体中安装两根测桩（长2.0米的铝制标杆），通过对其开展测量以获取该冰川的表面运动数据。本次测量采用双频GPS接收机及天线（GNSS GEM-1）测定各测桩的三维空间位置，其中一根天线固定于冰川东岸的基岩上作为基准站。2016年7月与2017年7月，研究人员分别在编号为1603与B16BH1的测桩上安装天线并开展了30分钟的观测作业。随后使用GPS软件（RTKLIB）以静态模式对上述观测数据进行处理，计算得到各测桩的空间位置。经估算，本次测量的误差低于10毫米。