Data analysis of Shipborne EM31-ICE measuring in Chinas fourth Arctic scientific expedition

• Main Authors: Wang, Jie, Guo, Jingxue, Wang, Huajun, Sun, Bo, Tian , Gang
• Format: Article in Journal/Newspaper
• Language: unknown
• Subjects: Atmosphere; Oceans; Arctic; Advances in Polar Science; ice core; Polar Science; Sea ice
• Online Access: http://library.arcticportal.org/1685/; http://journal.polar.gov.cn/EN/article/downloadArticleFile.do?attachType=PDF&id=10125

Electromagnetic (EM) measurement of sea ice is an efficient, fast and high-precision method. In the present paper, we used shipborne data in the fourth Chinese National Arctic Research Expedition, which was acquired by EM31-ICE electromagnetic induction device ,laser range finder as well as a sonar. Through pre-processing the preliminary data of sea ice thickness ,and then combined with calibration in formation from ice core samples in the long-term ice stations, we obtained the correction parameters of EM31-ICE. Results through the analysis of anomalous data together with wavelet denoising and statistical processing, demonstrate that: ice thickness mainly varies between 0.5m and 2.5m in the way to arctic, where as in the back way from arctic, it becomes thinner, ranging from 0.5m to 2.0m. The thickness of sea ice in high-latitude regions is significantly greater than those in low-latitude regions.More over , in high-latitude regions, two peaks appear in the histograms of sea ice thickness, while in the low-latitude regions only one peak appears. Through out the whole ogo and return process , ice with the thickness over 4m is less than 1%. Full text in Chinese only.