大地测量学与导航

利用ICESat数据确定北冰洋海冰出水高度——以2005—2006年为例

  • 陈国栋 ,
  • 李建成 ,
  • 褚永海 ,
  • 李大炜
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  • 武汉大学测绘学院, 湖北 武汉 430079
陈国栋(1986—),男,博士生,研究方向为卫星测高。E-mail: cgdtt@126.com

收稿日期: 2014-09-12

  修回日期: 2015-01-04

  网络出版日期: 2015-07-28

基金资助

国家自然科学基金(41404028)

Determination of Sea Ice Freeboard in Arctic from ICESat: Case Study of 2005—2006

  • CHEN Guodong ,
  • LI Jiancheng ,
  • CHU Yonghai ,
  • LI Dawei
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  • School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

Received date: 2014-09-12

  Revised date: 2015-01-04

  Online published: 2015-07-28

Supported by

The National Natural Science Foundation of China (41404028)

摘要

提出了在结合高程特征变化的基础上利用ICESat海冰观测数据波形参数确定北冰洋海冰出水高度的方法,并与目前常用的最低点法进行比较。结果表明,最低点法计算的海冰出水高度不仅在空间分布上存在系统性误差,并且容易受到粗差影响,而本文的方法则具有较高的可靠性。本文在最低点法中加入高程标准差限制,并与本文提出的方法结合,计算并分析了2005年至2006年6个ICESat任务期的北冰洋海冰出水高度的季节变化。结果表明,2005年夏天的异常气候对于北冰洋海冰具有深远的影响,不仅使当年秋季的海冰出水高度大大减小,而且海冰的组成比例也发生了巨大变化。

本文引用格式

陈国栋 , 李建成 , 褚永海 , 李大炜 . 利用ICESat数据确定北冰洋海冰出水高度——以2005—2006年为例[J]. 测绘学报, 2015 , 44(6) : 625 -633 . DOI: 10.11947/j.AGCS.2015.20140478

Abstract

Based on variation characters of sea surface height and parameters of ICESat return pulse waveform, a method is proposed for estimating Arctic sea ice freeboard with ICESat observation. This proposed method is compared with the common ‘lowest-level’ method. The results show that the lowest-level method is vulnerable to gross errors and present systematic errors in spatial distribution of freeboard. But the proposed method is more reliable than the lowest-level method. The lowest-level method is improved by the employ of an elevation standard deviation threshold and combined with the proposed method to estimate sea ice freeboard for six ICESat campaigns between 2005 and 2006 to review the seasonal variability. The results show that the abnormal climate in the summer of 2005 have a profound impact on arctic sea ice, which caused the decrease of freeboard and changed the constituent of sea ice as well.

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