Ground-penetrating radar (GPR) point measurements of ice thickness in Austria

Glacier thickness is an important factor in the course of glacier retreat in a warming climate. Thiese study data presents the results (point data) of GPR surveys on 66 Austrian mountain glaciers carried out between 1995 and 2014. The glacier areas range from 0.001 to 18.4 km**2, and their ice thickness has been surveyed with an average density of 36 points/km**2 . The glacier areas and surface elevations refer to the second Austrian glacier inventory (mapped between 1996 and 2002). According to the glacier state recorded in the second glacier inventory, the 64 glaciers cover an area of 223.3±3.6 km**3. Maps of glacier thickness have been calculated by Fischer and Kuhn (2013) with a mean thickness of 50±3 m and contain an glacier volume of 11.9±1.1 km**3. The mean maximum ice thickness is 119±5 m.
The ice thickness measurements have been carried out with the transmitter of Narod and Clarke (1994) combined with restively loaded dipole antennas (Wu and King, 1965; Rose and Vickers, 1974) at central wavelengths of 6.5 (30 m antenna length) and 4.0 MHz (50 m antenna length). The signal was recorded trace by trace with an oscilloscope. 168 m/µs as used by Haeberli et al. (1982), Bauder (2001), and Narod and Clarke (1994), the signal velocity in air is assumed to be 300 m/µs.
Details on the method can be are found in Fischer and Kuhn (2013), as well as Span et al. (2005) and Fischer et al. (2007).

在气候变暖的背景下，冰川厚度是冰川退缩过程中的关键影响因子。本研究数据集提供了1995年至2014年间，针对奥地利66座山地冰川开展的探地雷达（Ground Penetrating Radar, GPR）勘测点位数据成果。
这些冰川的面积介于0.001至18.4 km²之间，冰厚勘测的平均布点密度为36个点位/km²。冰川面积与表面高程数据引自第二次奥地利冰川名录（1996年至2002年测绘完成）。根据第二次冰川名录记录的冰川状态，64座冰川的总面积为223.3±3.6 km²。由Fischer与Kuhn（2013）计算得到的冰川厚度分布图，平均冰厚为50±3 m，对应冰川总体积为11.9±1.1 km³，平均最大冰厚为119±5 m。
本次冰厚勘测采用Narod与Clarke（1994）研发的发射装置，搭配阻性加载偶极天线（Wu与King, 1965; Rose与Vickers, 1974），工作中心波长分别为6.5 MHz（天线长度30 m）与4.0 MHz（天线长度50 m）。信号通过示波器逐道记录。参考Haeberli等（1982）、Bauder（2001）以及Narod与Clarke（1994）的研究方案，本次勘测采用冰中电磁波传播速度为168 m/µs，并假设空气中电磁波传播速度为300 m/µs。
关于勘测方法的详细细节，可参见Fischer与Kuhn（2013）、Span等（2005）以及Fischer等（2007）的相关研究文献。