Ice thickness of Bowdoin Glacier, Greenland in July 2014

We used an ice-penetrating radar system manufactured by The Ohio State University, USA. The system is composed of a transmitter, receiver and 20 m long dipole antennae. The transmitter radiates electromagnetic waves (central frequency 5 MHz) in the form of a short high-voltage pulse. The distance between the transmitter and receiver was 20 m. We measured wave propagation speed in the glacier using the common-midpoint method. The ice thickness measurement was carried out every 20 m along one longitudinal and three transverse profiles.本研究使用了由美国俄亥俄州立大学（The Ohio State University）研发的冰穿透雷达系统。该系统由发射机、接收机与20米长的偶极子天线组成。发射机以短高压脉冲的形式辐射电磁波（中心频率5 MHz），发射机与接收机间距为20米。本研究采用共中心点法（common-midpoint method）测量了冰川内部的电磁波传播速度。沿1条纵向剖面与3条横向剖面，以每20米的间隔开展冰厚测量工作。