| Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument |
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| 作者姓名： | 郭井学 孙波 |
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| 作者单位： | Polar Research Institute of China，Polar Research Institute of China Shanghai 200136，China，Shanghai 200136，China |
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| 基金项目： | 国家自然科学基金
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科技部资助项目
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国家高技术研究发展计划(863计划) |
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| 摘 要： | As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.
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Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument |
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| Guo Jingxue,Sun Bo.Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument[J].Chinese Journal of Polar Science,2007,18(1):36-46. |
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| Authors: | Guo Jingxue Sun Bo |
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| Abstract: | As an important component of the cryosphere, sea ice is very sensitive to the climate change. The study of the sea ice physics needs accurate sea ice thickness. This paper presents an electromagnetic-induction (EM) technique which can be used to measure the sea ice thickness distribution efficiently, and the successful application in Bothnian Bay. Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately, than the sea ice thickness is obtained. Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness. The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%. The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4 - 0.6 m. |
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| Keywords: | Electromagnetic-induction Sea ice Thickness Bothnian Bay instrument electromagnetic induction spring statistic ice thickness profiles level verification reliable average relative error analysis data value construction formula apparent conductivity water interface detect |
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