南极埃默里冰架“松动牙齿”冰裂缝内冰雪填充物监测  

Monitoring Mélange in the loose tooth rift at the Amery Ice Shelf in the Antarctic

作　　者：杨宸 程晓[1,2,3,4] 李腾 刘岩[1,2,3] 张宝钢 YANG Chen;CHENG Xiao;LI Teng;LIU Yan;ZHANG Baogang(State Key Laboratory of Remote Sensing Science,College of Global Change and Earth System Science,Beijing Normal University,100875,Beijing,China;University Corporation for Polar Research,100875,Beijing,China;Southern Marine Science and Engineering Guangdong Laboratory,519000,Zhuhai,Guangdong,China;School of Geospatial Engineering and Science,Sun Yat-sen University,519000,Zhuhai,Guangdong,China)

机构地区：[1]北京师范大学全球变化与地球科学研究院遥感科学国家重点实验室,北京100875 [2]中国高校极地联合研究中心,北京100875 [3]南方海洋科学与工程广东省实验室,广东珠海519000 [4]中山大学测绘科学与技术学院,广东珠海519000

出　　处：《北京师范大学学报（自然科学版）》2021年第4期539-544,共6页Journal of Beijing Normal University(Natural Science)

基　　金：国家重点研发计划资助项目(2018YFA0605403,2016YFA0600103);国家自然科学基金资助项目(41830536,41676176,41676182,41406211)。

摘　　要：冰架裂缝的冰雪填充物(Mélange)分布和变化受冰架变化的影响,同时会影响冰架的稳定性.2019年9月25日,东南极埃默里冰架"松动牙齿"裂缝系统发生崩解,形成了面积>1600 km^(2)的冰山,裂缝内的填充物出现部分流失.采用Landsat-8卫星光学数据和哨兵1号卫星SAR影响数据,结合CryoSat-2卫星测高数据和南极参考高程模型计划(REMA)8 m分辨率DEM产品,对埃默里冰架"松动牙齿"裂缝L1、T1、T2的填充物表面形态特征及其变化进行了定量评估.结果显示:T1裂缝填充物的高程平均高于T2裂缝,表面起伏变化更明显;2016-2018年L1裂缝系统填充物高程逐年降低;在诸多影响因素中,冰流缝合区的存在对填充物冰厚度的影响不容忽视;裂缝中填充物的存在很可能促进裂缝的延伸发育.A large calving event occurred in late September 2019 in the loose tooth rift system of Amery Ice Shelf in east Antarctica,forming a giant iceberg of>1600 km^(2)in area.There are a large number of Mélanges in the rifts of the Ice Shelf,which were partially lost due to calving event.Together with Landsat-8 optical data and Sentienl-1 SAR data,CryoSat-2 altimetry data and 8 m resolution DEM products released by REMA project were used to study terrain characteristics of Mélanges in detail.It is found that the annual elevation of Mélanges decreased from 2016-2018.The average elevation and standard deviation of Mélange in T1 were found to be higher than that in T2.Encounter with ice stream suture zone will influence Mélange in the rift,likely to promote propagation of the rift.

关 键 词：南极 埃默里冰架 冰裂缝 填充物 

分 类 号：P237[天文地球—摄影测量与遥感]