In July, 2009, we investigated the Ningchan River Glacier No. 3. A control network was established around the glacier and the expedition used a GPS-RTK to measure glacial area, terminal and surface altitude, and used ...In July, 2009, we investigated the Ningchan River Glacier No. 3. A control network was established around the glacier and the expedition used a GPS-RTK to measure glacial area, terminal and surface altitude, and used an EKKO GPR to measure glacier thickness. We used a topographic map based on 1972 aerial photo, two TM images in 1995, 2009, and GPS-RTK data in 2009, to analyze the change of the Ningchan River Glacier No. 3 since 1972. Through analysis we found this glacier has been seriously shrinking over the past 37 years. The glacier terminal retreated about 6%, the area was reduced about 13.1%, the volume was reduced about 35.3%, and glacier shrinkage is mainly in the form of thinning. Glacier average thickness reduced from 36.8 m in 1972, to 27.4 m in 2009. Meteorological data around the study area shows that this region in recent decades has undergone differential warming which is the main reason for rapid glacier shrinkage.展开更多
The Xiying River,one of eight tributaries of the Shiyang River,located at Lenglongling,east Qilian Mountain,is formed by the confluence of Luotuo,Qingyang,Ningchan,and Shuiguan rivers.In the Xiying River Basin,where h...The Xiying River,one of eight tributaries of the Shiyang River,located at Lenglongling,east Qilian Mountain,is formed by the confluence of Luotuo,Qingyang,Ningchan,and Shuiguan rivers.In the Xiying River Basin,where have 42 glaciers which toward NE in the majority.In this study,three Landsat images and two topographic maps were used to extract boundaries by artificial vector quantization.Results show that glacier area in Xiying Basin increased slightly around 1987,since then,has been reduced considerably.From 1956/1972 to 2008,glacier area in Xiying River Basin was reduced by20.76%,nine glaciers have disappeared,and below 4,100 m a.s.l.,there is no ice cover.Variation tendency of glacier retreat was obviously controlled by orientation.Temperature increase especially after 1987 is the main reason of glacier shrinkage,where glaciers in the Xiying River Basin are more sensitive to climate change.展开更多
基金supported by the State Natural Science Fund projects(41071046 and 41201067)the project from the State Key Laboratory of Cryospheric Sciences(SKLCS-ZZ-2012-01-05)the Project for Incubation of Specialists in Glaciology and Geocryology of Nation-al Natural Science Foundation of China(J0930003/J0109)
文摘In July, 2009, we investigated the Ningchan River Glacier No. 3. A control network was established around the glacier and the expedition used a GPS-RTK to measure glacial area, terminal and surface altitude, and used an EKKO GPR to measure glacier thickness. We used a topographic map based on 1972 aerial photo, two TM images in 1995, 2009, and GPS-RTK data in 2009, to analyze the change of the Ningchan River Glacier No. 3 since 1972. Through analysis we found this glacier has been seriously shrinking over the past 37 years. The glacier terminal retreated about 6%, the area was reduced about 13.1%, the volume was reduced about 35.3%, and glacier shrinkage is mainly in the form of thinning. Glacier average thickness reduced from 36.8 m in 1972, to 27.4 m in 2009. Meteorological data around the study area shows that this region in recent decades has undergone differential warming which is the main reason for rapid glacier shrinkage.
基金supported by the Project from the National Foundational Scientific and Technological Work Programs of the Ministry of Science and Technology of China (Grant No. 2013FY111400)the State Key Laboratory of Cryospheric Sciences (SKLCS-ZZ-2017)+3 种基金the Global Change Research Program of China (2013CBA01801)the Chinese Academy of Sciences (KJZD-EW-G03-01)the National Natural Science Foundation of China (41371091)the Coordinate system conversion system v1.0 (2016SR394422)
文摘The Xiying River,one of eight tributaries of the Shiyang River,located at Lenglongling,east Qilian Mountain,is formed by the confluence of Luotuo,Qingyang,Ningchan,and Shuiguan rivers.In the Xiying River Basin,where have 42 glaciers which toward NE in the majority.In this study,three Landsat images and two topographic maps were used to extract boundaries by artificial vector quantization.Results show that glacier area in Xiying Basin increased slightly around 1987,since then,has been reduced considerably.From 1956/1972 to 2008,glacier area in Xiying River Basin was reduced by20.76%,nine glaciers have disappeared,and below 4,100 m a.s.l.,there is no ice cover.Variation tendency of glacier retreat was obviously controlled by orientation.Temperature increase especially after 1987 is the main reason of glacier shrinkage,where glaciers in the Xiying River Basin are more sensitive to climate change.
