Assessment and application of electromagnetic induction method to measure Arctic sea ice thickness  

作　　者：GUO Jingxue WANG Huajun SUN Bo 

机构地区：[1]Polar Glaciology Division, Polar Research Institute of China [2]School of Earth Sciences, Zhejiang University

出　　处：《Advances in Polar Science》2015年第4期292-298,共7页极地科学进展（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant no.41006116);the National Major Scientific Research Project(Grant no.2013CBA01804);the Chinese Polar Environmental Comprehensive Investigation and Assessment Programs(Grant no.CHINARE-2015-02-02)

摘　　要：The electromagnetic induction method is widely used to measure sea ice thickness. Based on the electrical properties of sea ice and seawater, the method measures the apparent conductivity, which represents the conductivity of the half-space, and calculates the thickness of the sea ice. During the fourth Chinese National Arctic Research Expedition in summer 2010, an integrated electromagnetic induction system was set up on the icebreaker R/V XUE LONG to measure sea ice thickness along the ship＇s tracks to the north of the Chukchi Sea. The conductivities of sea ice, seawater, and brine were measured and a simple forward model was used to explain the effect of changes in those conductivities on the apparent conductivity over a horizontal layered structure. The results of this analysis indicated that when using the electromagnetic induction method to measure sea ice thickness, the conductivity of sea ice could be neglected and the conductivity of seawater could be treated as a constant. The ice distribution results derived from the electromagnetic induction method showed that the typical sea ice thickness was 160 cm and 90 cm during the outbound and the return legs of the voyage, respectively.The electromagnetic induction method is widely used to measure sea ice thickness. Based on the electrical properties of sea ice and seawater, the method measures the apparent conductivity, which represents the conductivity of the half-space, and calculates the thickness of the sea ice. During the fourth Chinese National Arctic Research Expedition in summer 2010, an integrated electromagnetic induction system was set up on the icebreaker R/V XUE LONG to measure sea ice thickness along the ship＇s tracks to the north of the Chukchi Sea. The conductivities of sea ice, seawater, and brine were measured and a simple forward model was used to explain the effect of changes in those conductivities on the apparent conductivity over a horizontal layered structure. The results of this analysis indicated that when using the electromagnetic induction method to measure sea ice thickness, the conductivity of sea ice could be neglected and the conductivity of seawater could be treated as a constant. The ice distribution results derived from the electromagnetic induction method showed that the typical sea ice thickness was 160 cm and 90 cm during the outbound and the return legs of the voyage, respectively.

关 键 词：sea ice thickness electromagnetic induction forward calculation CONDUCTIVITY ARCTIC 

分 类 号：P714.1[天文地球—海洋科学]