Glacier is a common sensitivity indicator of environmental and global climate change.Examining the relationship between glacier area and climate change will help reveal glacier change mechanisms and future trends.Glac...Glacier is a common sensitivity indicator of environmental and global climate change.Examining the relationship between glacier area and climate change will help reveal glacier change mechanisms and future trends.Glacier changes are also of great significance to the regulation of regional water resources.This study selected the Hala Lake Basin in the northeastern Qinhai-Tibet Plateau as a study area,and examined the relationships between the temporal and spatial change of glaciers in the northeastern Qinghai-Tibet Plateau and climate change based on remote sensing imagery,climatological data,and topographic data during the past 30 years.Results showed that glacier area in the Hala Lake basin fluctuated and decreased from106.24 km2 in 1986 to 78.84 km2 in 2015,with a decreasing rate of 0.94 km2·yr-1.The number of glacier patches,mean patch area,and largest patch index all decreased from 1986 to 2015,while the splitting index increased from 1986 to 2015,indicating that the landscape fragmentation of glacier in the Hala Lake Basin was increasing significantly during the study period.Glacier area change was mainly concentrated in the slopes>25°with an altitude of 4500-5000 m,and the retreating rate of glacier of sunny slope was obviously higher than that of shady slope.Geometric center of glacier in the basin moved from southwest to northeast towards high altitude.Results of the response of glacier extent to climate change showed that temperature was the dominant factor affecting glacier area dynamic change in the Hala Lake Basin.It is predicted that in future several years,the glacier area will decrease and fragment continually as a result of global warming on the Tibetan Plateau.展开更多
湖泊面积的动态监测不仅有利于分析区域气候变化的情景,而且还能为区域水资源评估等带来可靠的数据源。利用1986—2019年的多源卫星资料,提取了哈拉湖水体面积,并结合哈拉湖周边德令哈和托勒2个气象台站观测资料,对哈拉湖近36年湖泊年...湖泊面积的动态监测不仅有利于分析区域气候变化的情景,而且还能为区域水资源评估等带来可靠的数据源。利用1986—2019年的多源卫星资料,提取了哈拉湖水体面积,并结合哈拉湖周边德令哈和托勒2个气象台站观测资料,对哈拉湖近36年湖泊年代际、年际及年内动态变化及其成因进行了分析。结果表明:1980s至2010s哈拉湖面积呈现先减小后增大趋势,其中20世纪90年代平均面积最小,2010年以来哈拉湖年平均面积最大;1986—2019年哈拉湖面积呈现先减小后增大的趋势,1986—2001年湖泊面积呈缓慢下降趋势,2002—2019年湖泊呈扩张趋势;从年内变化来看,近3年来,1—12月湖泊面积呈先减小后增大趋势,其中,2019年与前两年相比,湖泊面积除4月和12月与2018年大致相当外,其余各月面积均大于前两年,且近3年月面积最大和最小之间的差值分别为10.08、12.52 km 2;此外,哈拉湖湖岸线变化较明显的区域位于哈拉湖东南部和西南部。气象和冰川资料分析表明:1961—2018年哈拉湖地区气候呈增暖增湿趋势,气温上升速率为0.4℃/(10a)(R=0.296),降水增加速率为19.3 mm/(10a)(R=0.562,P<0.01)。气候的暖湿化与冰川面积的退缩共同导致了湖泊面积的扩张,但以降水作用为主。展开更多
基金supported by the National Science Foundation of China (41730854, 41877157, 41530854)the Project supported by State Key Laboratory of Loess and Quaternary Geology (SKLLQG1604)+2 种基金the Project supported by State Key Laboratory of Earth Surface Processes and Resource Ecology (2017-KF-15)the Project of Shandong Province Higher Educational Science and Technology Program (J17KA192)the National Key Research and Development Plan of Shandong Province (2018GSF117021)
文摘Glacier is a common sensitivity indicator of environmental and global climate change.Examining the relationship between glacier area and climate change will help reveal glacier change mechanisms and future trends.Glacier changes are also of great significance to the regulation of regional water resources.This study selected the Hala Lake Basin in the northeastern Qinhai-Tibet Plateau as a study area,and examined the relationships between the temporal and spatial change of glaciers in the northeastern Qinghai-Tibet Plateau and climate change based on remote sensing imagery,climatological data,and topographic data during the past 30 years.Results showed that glacier area in the Hala Lake basin fluctuated and decreased from106.24 km2 in 1986 to 78.84 km2 in 2015,with a decreasing rate of 0.94 km2·yr-1.The number of glacier patches,mean patch area,and largest patch index all decreased from 1986 to 2015,while the splitting index increased from 1986 to 2015,indicating that the landscape fragmentation of glacier in the Hala Lake Basin was increasing significantly during the study period.Glacier area change was mainly concentrated in the slopes>25°with an altitude of 4500-5000 m,and the retreating rate of glacier of sunny slope was obviously higher than that of shady slope.Geometric center of glacier in the basin moved from southwest to northeast towards high altitude.Results of the response of glacier extent to climate change showed that temperature was the dominant factor affecting glacier area dynamic change in the Hala Lake Basin.It is predicted that in future several years,the glacier area will decrease and fragment continually as a result of global warming on the Tibetan Plateau.
文摘湖泊面积的动态监测不仅有利于分析区域气候变化的情景,而且还能为区域水资源评估等带来可靠的数据源。利用1986—2019年的多源卫星资料,提取了哈拉湖水体面积,并结合哈拉湖周边德令哈和托勒2个气象台站观测资料,对哈拉湖近36年湖泊年代际、年际及年内动态变化及其成因进行了分析。结果表明:1980s至2010s哈拉湖面积呈现先减小后增大趋势,其中20世纪90年代平均面积最小,2010年以来哈拉湖年平均面积最大;1986—2019年哈拉湖面积呈现先减小后增大的趋势,1986—2001年湖泊面积呈缓慢下降趋势,2002—2019年湖泊呈扩张趋势;从年内变化来看,近3年来,1—12月湖泊面积呈先减小后增大趋势,其中,2019年与前两年相比,湖泊面积除4月和12月与2018年大致相当外,其余各月面积均大于前两年,且近3年月面积最大和最小之间的差值分别为10.08、12.52 km 2;此外,哈拉湖湖岸线变化较明显的区域位于哈拉湖东南部和西南部。气象和冰川资料分析表明:1961—2018年哈拉湖地区气候呈增暖增湿趋势,气温上升速率为0.4℃/(10a)(R=0.296),降水增加速率为19.3 mm/(10a)(R=0.562,P<0.01)。气候的暖湿化与冰川面积的退缩共同导致了湖泊面积的扩张,但以降水作用为主。
