摘要
冰面湖作为区域气候变化的灵敏指示器,对研究全球气候变化背景下南极冰冻圈的稳定性具有重要意义。本文基于2000—2019年区域气象数据、LandsatETM+/OLI影像与LIMA(LandsatImageMosaicof Antarctica)镶嵌影像,选取东南极的埃默里冰架和西南极的拉森A冰架作为研究区,采用归一化水体指数(Normalized Difference Water Index, NDWI)提取冰面湖面积信息,对冰面湖面积与气象数据开展遥相关分析,探索冰面湖与区域气候变化的联系。结果表明:埃默里冰面湖总面积较为稳定并有减小趋势,拉森A冰面湖总面积则呈增加趋势;冰面湖与气温和海温之间存在正向反馈特征;两个冰架区域的反馈特征规律明显不同,埃默里冰面湖面积受气温影响显著,但受海温影响并不明显,而拉森A冰面湖则对海温变化敏感,其面积与海温变化趋势一致。
As a sensitive indicator of regional climate change,Antarctic supraglacial lakes are important for studying the stability of the cryosphere under global climate change.Using the Normalized Difference Water Index,we extracted supraglacial lakes on Amery Ice Shelf in East Antarctica and Larsen A Ice Shelf in West Antarctica from Landsat Enhanced Thematic Mapper(ETM+)/Operational Lander Imager(OLI)images and Landsat Image Mosaic of Antarctica(LIMA)mosaic images,and explored teleconnections between supraglacial lakes and 2000–2019 regional meteorological data,and the relationship between supraglacial lakes and regional climate change.Total surface area of supraglacial lakes on Amery Ice Shelf is relatively stable and decreasing,while that on Larsen A Ice Shelf is increasing.We found positive feedbacks between lake surface area,air temperature and sea surface temperature,which differ between the two ice shelves.On Amery Ice Shelf,lake surface area is considerably affected by air temperature,and unaffected by sea surface temperature.On Larsen A Ice Shelf,lake surface area is sensitive to changes in sea surface temperature and varies with sea surface temperature.
作者
王辉
卢善龙
丁俊
邱玉宝
唐海龙
闫强
Wang Hui;Lu Shanlong;Ding Jun;Qiu Yubao;Tang Hailong;Yan Qiang(College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;Key Laboratory of Digital Earth Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100101,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)
出处
《极地研究》
CAS
CSCD
北大核心
2020年第3期322-335,共14页
Chinese Journal of Polar Research
基金
国家自然科学基金重大研究计划重点支持项目(91637209)
国家重点研发计划水资源高效开发利用专项(2017YFC0405802)
中国科学院战略性先导科技专项(A类)(XDA1907020104)
地质矿产调查评价项目:中国水资源生态配置及全球战略(DD20190652)资助。
关键词
冰面湖
气候变化
气温
海表面温度
冰架
supraglacial lakes
climate change
air temperature
sea surface temperature
ice shelf
