利用冰雷达诊断南极冰盖底部环境的研究综述

A REVIEW OF THE USE OF ICE PENETRATING RADAR TO DIAGNOSE THE SUBGLACIAL ENVIRONMENTS

现今南极冰盖底部的环境对冰盖的动力演化有着重要的影响,准确的冰盖底部环境信息有利于更加准确地模拟南极冰盖的起源、发展以及未来的演化。采用无线电回波技术,可有效地对冰盖进行探测。通过定量地处理雷达波在冰盖内部的介电衰减,可以获取冰盖底部的反射率,从而对冰盖底部环境,特别是冰下水文环境进行诊断。综述了雷达波在冰盖内部衰减处理的三种方法,分析了它们的适用性及局限性,并对这些方法应用于诊断冰盖底部的环境以及方法本身可能的改进进行了讨论。

The subglacial environment in Antarctica has important effects on the evolution of the Antarctic ice sheet. Accurate information on the subglacial environment information will therefore enable more accurate simulation of the evolution of the ice sheet. Currently, radio echo sounding is the most effective technique available to investigate the development of ice sheet. The subglacial environment, in particular the hydrological environment, can be monitored based on bed reflectivity, which is measured by quantitative analysis of the dielectric attenuation of radar waves in the ice sheet. Three methods used to process radar wave attenuation in the ice sheet are reviewed, the applicability and limitations of these methods are analyzed, the subglacial environment is determined using each method, and potential improvements are discussed.