典型文献
Simulation of frozen ground distribution in northeast China based on a surface frost number model
文献摘要：
Against the background of global warming,environmental and ecological problems caused by frozen ground degradation have become a focus of attention for the scientific community.As the temperature rises,the permafrost is degrading significantly in the frozen ground region of northeast China(FGRN China).At present,research on FGRN China is based mainly on data from meteorological stations,and the research period has been short.In this study,we analyzed spatial and temporal variation in the ground surface freezing index(GFI)and ground surface thawing index(GTI)from 1900 to 2017 for FGRN China,with the air freezing index(AFI)and air thawing index(ATI)using the University of Delaware(UDEL)monthly gridded air temperature dataset.The turning point year for annual mean air temper-ature(AMAT)was identified as 1985,and the turning point years for GFI and GTI were 1977 and 1996.The air temperature increased by 0.01℃per year during 1900-2017,and the GFI and GTI increased at rates of-0.4 and 0.5℃d per year before the turning point year;after the turning point,these rates were-0.7 and-2.1℃d per year.We utilized a surface frost number model to study the distribution of frozen ground in FGRN China from 1900 to 2017.When the empirical coefficient E value is 0.57,the simulated frozen ground distribution is basically consistent with the existing frozen ground maps.The total area of permafrost in FGRN China decreased by 22.66×104 km2 from 1900 to 2017,and the permafrost boundary moved northward with obvious degradation.The results of this study demonstrate the trend in permafrost boundary degradation in FGRN China,and provide basic data for research on the hydrological,climate,and ecological changes caused by permafrost degradation.
文献关键词：
中图分类号：
作者姓名：
ZHAN Daqing;MAN Haoran;ZANG Shuying;LI Miao
作者机构：
College of Geographical Science,Harbin Normal University,Harbin 150025,China;Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions,Harbin 150025,China
文献出处：
引用格式：
[1]ZHAN Daqing;MAN Haoran;ZANG Shuying;LI Miao-.Simulation of frozen ground distribution in northeast China based on a surface frost number model)[J].地理学报（英文版）,2022(08):1581-1600
A类：
FGRN,Delaware,AMAT
B类：
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AB值：
0.410747
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