摘要
极地冰盖冻融强度信息在理解冰盖稳定性及其对气候变化响应中具有重要意义。利用格陵兰岛2016年Sentinel-1A干涉宽幅双极化SAR数据(HH+HV),结合同时相自动气象站点温度和MODIS温度产品数据,研究了HH、HV极化幅度值及HH/HV比值与冻融强度的相关关系。结果表明冻融强度与HH、HV极化幅度值呈负相关关系,而与HH/HV值呈正相关关系,且与HH/HV值的相关性更好, R^2值约0.610。基于MODIS温度产品建立了冰盖冻融强度划分的5个HH/HV区间阈值,最后通过MODIS温度产品的结果验证表明,利用HH/HV值的冻融强度提取精度为86.8%。
Data on freezing and melting of polar ice sheets are important for understanding ice sheet stability and ice sheet response to climate change.We examined relationships between ice sheet freeze/melt extent,HH and HV polarization amplitudes and HH/HV values using Sentinel-1A IW SAR images from 2016,AWS data and MODIS temperature products.We found that freeze/melt extent is negatively correlated with HH and HV polarization amplitudes and positively correlated with HH/HV value,and R2 is higher in the correlation with HH/HV value(>0.6)than that with polarization amplitudes.Using MODIS temperature products,we established five HH/HV thresholds to measure freeze/melt extent of the Greenland ice sheet.Using MODIS temperature products,we found that the accuracy of extracting freeze/melt extent using HH/HV value is 86.8%.
作者
赵梦雪
傅文学
孙燕武
李新武
Zhao Mengxue;Fu Wenxue;Sun Yanwu;Li Xinwu(Laboratory of Digital Earth Science,Aerospace Information Research Institute,CAS,Beijing 100094,China;College of Geomatics,Shandong University of Science and Technology,Shandong 266590,China;College of Geomatics,Anhui University of Science and Technology,Anhui 232000,China)
出处
《极地研究》
CAS
CSCD
北大核心
2020年第3期336-342,共7页
Chinese Journal of Polar Research
基金
国家重点研发计划(2016YFB0501501)资助。
关键词
格陵兰岛
冰盖冻融
冻融强度
宽幅SAR
Greenland
freezing and melting in ice sheet
freeze/melt extent
IW SAR
