极地研究

极地研究 ›› 2012, Vol. 24 ›› Issue (1): 47-52.DOI: 10.3724/SP.J.1084.2012.00047

• 研究论文 • 上一篇    下一篇

中国第四次北极科学考察EM31-ICE走航海冰厚度数据分析

王杰1,郭井学2,王华军1,孙波2,田钢1   

  1. 1. 浙江大学地球科学系
    2. 中国极地研究中心
  • 收稿日期:2011-06-27 修回日期:2011-11-24 出版日期:2012-03-30 发布日期:2012-03-30
  • 通讯作者: 王华军
  • 基金资助:

    ;自然基金项目;海洋青年基金项目;极地战略基金项目

Data analysis of Shipborne EM31-ICE measuring in China's fourth Arctic scientific expedition

  • Received:2011-06-27 Revised:2011-11-24 Online:2012-03-30 Published:2012-03-30

PDF (PC)

1790

被引次数

4

摘要：

利用ＥＭ３１-ＩＣＥ电磁感应仪与激光测距仪、声纳等设备在中国第四次北极科学考察过程对海冰厚度进行走航观测，通过对数据预处理获得了海冰厚度数据，结合长期冰站上采集的多组冰厚样本，获得ＥＭ３１-ＩＣＥ的各项校正参数。同时通过对异常数据的分析以及小波去噪、统计处理等方法，得出最终的解释结果：在去程时海冰厚度主要分布在０．５—２．５ｍ之间，而返程时的海冰厚度有明显变薄的倾向，主要分布在０．５—２．０ｍ之间。在高纬度地区海冰厚度明显大于低纬度地区，并且在高纬度地区海冰厚度统计图中常出现两个波峰，而低纬度地区常是一个波峰。在整个去程与返程过程中，超过４ｍ厚的海冰不到１％。

关键词: 北极, 海冰厚度, 走航观测, EM31-ICE, 小波去噪

Abstract:

The thickness of sea ice is a key parameter in the study of global climate change. The measurement of Sea ice thickness remains a tough issue in current research of sea ice. Electromagnetic (EM) measurement of sea ice is an efficient, fast and high-precision method. In the present paper, we used shipborne data in China's fourth Arctic scientific expedition, which was acquired by EM31-ICE electromagnetic induction device, laser range finder as well as sonar . Through pre-processing the preliminary data of sea ice thickness, and then combined with calibration information 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, whereas 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. Moreover, in high-latitude regions, two peaks appear in the histograms of sea ice thickness, while in the low-latitude regions only one peak appears. Throughout the whole go and return process, ice with the thickness over 4m is less than 1%.

Key words: Arctic, sea ice thickness, shipborne measurement, EM31-ICE, wavelet denoising