In situ index-of-refraction measurements of the South Polar firn with the RICE detector
In situ index-of-refraction measurements of the South Polar firn with the RICE detector
复制标题
使用 RICE 探测器对南极冰原进行原位折射率测量
作者：
I. Kravchenko;D. Besson;J. Meyers
摘要利用南极的RICE （Radio Ice Cherenkov Experiment）探测器，我们估计了从表面到z =-150 m的高度(z)随折射率(n)的变化。测量方法是将偶极发射机放入干井（5英寸（127毫米）口径）中，并确定信号到达时间，作为发射机深度的函数，在冰川RICE接收器阵列中。我们清楚地证实了n (z)与冰密度的预期相关性。我们的测量结果与先前实验室对冰芯介电特性的描述完全一致。这是在南极进行的第一次实地测量。
Abstract Using the RICE (Radio Ice Cherenkov Experiment) detector at the South Pole, we have estimated the variation in the index of refraction (n) of the firn, as a function of elevation (z) measured from the surface down to z =-150 m. Measurements were made by lowering a dipole transmitter into a dry (5 in (127 mm) caliber) borehole, originally drilled for the RICE experiment in 1998, and determining signal arrival times, as a function of transmitter depth, in the englacial RICE receiver array. We clearly confirm the expected correlation of n (z) with ice density. Our measurements are in fair agreement with previous laboratory characterizations of the dielectric properties of ice cores. These are the first such in situ measurements to be performed at the South Pole.