电磁感应技术在南极海冰厚度探测中的应用  

Application of Electromagnetic Method in Antarctic Sea Ice Thickness Measurement

作　　者：郭井学[1] 孙波[2] 崔祥斌[2] 田钢[3] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]中国极地研究中心,上海200136 [3]浙江大学地球科学系,杭州310027

出　　处：《吉林大学学报（地球科学版）》2008年第2期330-335,共6页Journal of Jilin University：Earth Science Edition

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

摘　　要：介绍一种能够高效探测海冰厚度的电磁感应方法及其在南极考察中的应用。该技术方法针对海冰和海水的电特性,利用电磁场原理精确探测仪器至冰水交界面的距离,以实现海冰厚度的测定。通过电磁感应（EM）仪观测的视电导率与同点位钻孔测量数据对比分析,获得视电导率与海冰厚度的换算关系式,通过对用该关系式计算出的海冰厚度进行验证,表明电磁感应技术能够获得可靠的海冰厚度数据。对探测剖面的海冰厚度统计表明,2005—2006年夏季南极内拉峡湾内海冰以平整冰为主,其厚度为0.81.4 m。The authors present an electromagnetic（EM） technique which can efficiently measure the sea ice thickness. Due to the rather large resisitivity contrast between sea ice and water, EM method can readily determine the distance between EM antenna and ice/water interface. And after subtracting the height of EM antenna from sea ice surface, the sea ice thickness can be estimated. A formula to estimate the apparent conductivity and sea ice thickness has been obtained after the correlation analysis of the EM apparent conductivity and drill-hole data. The sea ice thickness estimated by the formula agrees well with drill data. Application of the method to an Antarctic test shows that the level ice distribution in the Antarctic Neila Fjord ranges from 0.8 m to 1.4 m in the summer of 2005 - 2006.

关 键 词：南极 电磁感应 视电导率 海冰厚度 钻孔测量 

分 类 号：P631.325[天文地球—地质矿产勘探]