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冰川冻土 ›› 2022, Vol. 44 ›› Issue (5): 1653-1664.doi: 10.7522/j.issn.1000-0240.2022.0145

• 冰冻圈技术 • 上一篇    

表碛覆盖型冰川的提取方法及变化

薛娇(), 姚晓军(), 张聪, 周苏刚, 褚馨德   

  1. 西北师范大学 地理与环境科学学院,甘肃 兰州 730070
  • 收稿日期:2021-11-21 修回日期:2022-08-25 出版日期:2022-10-25 发布日期:2022-11-05
  • 通讯作者: 姚晓军 E-mail:xuej_95@163.com;yaoxj_nwnu@163.com
  • 作者简介:薛娇,硕士研究生,主要从事冰冻圈变化研究. E-mail: xuej_95@163.com
  • 基金资助:
    国家自然科学基金项目(41861013);国家重点研发计划项目(2019YFE0127700);国家冰川冻土沙漠科学数据中心开放基金项目(20D02)

Extraction method and change of debris-covered glaciers

Jiao XUE(), Xiaojun YAO(), Cong ZHANG, Sugang ZHOU, Xinde CHU   

  1. College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China
  • Received:2021-11-21 Revised:2022-08-25 Online:2022-10-25 Published:2022-11-05
  • Contact: Xiaojun YAO E-mail:xuej_95@163.com;yaoxj_nwnu@163.com

摘要:

表碛覆盖型冰川是山地冰川的一种特殊类型,表碛的存在使得其对气候变化呈现出不同的响应特征。基于2011—2020年Landsat TM/ETM+/OLI遥感影像和ASTER DEM数据,在综合分析表碛光谱、地形和地表温度特征基础上提出TDSI(temperature NDDI slope ice)方法,并将其用于提取中国境内托木尔冰川等6条大陆型冰川和雅弄冰川等3条海洋型冰川。结果表明:基于TDSI方法提取表碛覆盖型冰川的总体精度为91.23%,其中大陆型和海洋型表碛覆盖冰川的精度分别为91.20%和90.97%。2011—2020年6条大陆型冰川和3条海洋型冰川面积平均减少0.06%和0.11%,而表碛面积分别增加了11.92%和18.35%。大陆型冰川表碛主要分布在其中值海拔以下,而海洋型冰川表碛分布范围更广,近10年间二者均呈现向冰川上部扩张趋势。气温上升是冰川消融退缩和表碛增加的主要原因,同时冰川流速变化和终碛湖演变也对表碛变化有一定影响。

关键词: 表碛, TDSI, 大陆型冰川, 海洋型冰川

Abstract:

As a special type of mountain glacier, debris-covered glaciers show different response to climate change due to the presence of debris. By analyzing the spectral characteristics, topographic and surface temperature of debris, we proposed a new method for automatically delineating debris-covered glacier, i.e., TDSI (temperature NDDI slope ice). Based on the Landsat TM/ETM+/OLI remote sensing images and ASTER DEM data from 2011 to 2020, the TDSI method was used to extract six continental glaciers in Karakoram Range and Tien Mountains and three maritime glaciers in Nyainqentanglha Range. The results show: the overall area accuracy of the TDSI method for extracting the debris-covered glaciers is 91.23%, with 91.20% and 90.97% for continental and maritime debris-covered glaciers, respectively. The area of six continental glaciers and three maritime glaciers decreased by 0.06% and 0.11% on average from 2011 to 2020, while the area of debris increased by 11.92% and 18.35%. The debris of continental glaciers are mainly located below median altitude, while the distributions of maritime glaciers’ debris are more extensive. During the past decade, the debris of both continental glaciers and maritime glaciers showed an obvious tendency of expanding to the upper part of glaciers. Rising temperature is the main reason for the decrease in glacier and the increase in debris. Meanwhile the change of ice velocities and the evolution of proglacial lakes near glacier terminus have a certain influence on the debris changes.

Key words: debris, TDSI, continental glacier, maritime glacier

中图分类号: 

  • P343.6