南极普里兹湾海冰厚度的电磁感应探测方法研究  

Research on electromagnetic inductive measurement of sea-ice thickness in Antarctic Prydz bay

作　　者：郭井学[1] 孙波[1] 田钢[2] 王帮兵[2] 张向培[1] 

机构地区：[1]中国极地研究中心,上海200136 [2]浙江大学理学院地球科学系,杭州310027

出　　处：《地球物理学报》2008年第2期596-602,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金(40476005和40233032);科技部专项基金(2005DIB3J114);“863”计划(2006AA04Z206和2006AA09Z152)资助

摘　　要：本文介绍一种由EM31-ICE型电磁感应仪和激光测距仪组合而成的船载电磁感应海冰厚度探测系统.针对海冰和海水的电学特征,运用电磁感应技术提取探测系统至海冰下底面的距离,运用激光测距仪测量冰面粗糙度和探测系统至海冰上表面的距离,两组数据结合,实现了海冰厚度的探测.通过南极现场探测数据分析,并与钻孔实测冰厚数据对比研究,定量分析了探测系统距离冰面的高度效应,建立了该系统冰厚测定值随高度变化的修正关系式,并对船载航行数据进行了系统校正.与SCAR ASPeCt的冰厚数据对比分析,表明该系统能够获得可靠的海冰厚度并具有较高的精度,且能满足对极区大范围海冰厚度观测的需求.The paper presents a shipbome electromagnetic induction detection system of sea-ice thickness consists of EM31-ICE electromagnetic instrument and laser altimeter. The system works according to the different electrical properties of sea-ice and seawater. The electromagnetic induction technology is used to obtain distance between the system and the bottom of sea-ice while the laser altimeter is employed to measure the roughness of ice surfaces and the distance between the system and the top of ice. A comparison of such data enables to achieve the measurement of sea-ice thickness. Analysis of the data obtained from Antarctic field and comparison to the value of the ice thickness from drilling allows a quantitative analysis of the height effect exists between the system and ice surface, construction of a correction formula of the measured value with height, and systematic calibration of the shipborne data. Comparison of ice thickness data acquired by the electromagnetic system to SCAR ASPeCt data indicates that the system is capable of achieving sea-ice thickness data with high precision, and satisfying the requirement for large-scale survey at polar zone.

关 键 词：南极 海冰厚度 电磁感应探测 气候变化 

分 类 号：P631[天文地球—地质矿产勘探]