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Spatial and temporal changes of glaciers and glacial lakes in the northern tianshan mountains over the past 30 years

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Journal of Geographical Sciences 2024年第9期34卷 1857-1880页

作者： HU Jiayu YAO Xiaojun ZHANG Cong ZHANG Yuan MA Yuxin College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China

Glaciers and glacial lakes are very sensitive to climate change,and studying their dynamics is important for revealing changes in global *** this study,we extracted the boundaries of glaciers and glacial lakes in the northern tianshan mountains based on Landsat TM/ETM+/OLI and Sentinel 2A/2B MSI remote sensing images and analyzed their dynamics and impacts over the past 30 *** findings indicate that in 2020,the northern tianshan region exhibited a total of 3254 glaciers,with an area of 1670.55 km^(2) and a volume of 95.69 km^(3).The corresponding numbers,areas,and volumes of glacial lakes were 281,13.23 km^(2) and 210.49×10~6 m^(3),*** the past 30 years,glaciers and glacial lakes have exhibited opposite *** former decreased by 16,332.64 km^(2)(-0.60%·a^(–1)) and 18.36 km^(3)(-0.58%·a^(–1)),respectively,and the latter increased by 56 and2.48 km^(2)(0.82%·a^(–1)) and 38.88×10~6 m^(3)(0.79%·a^(–1)),***,different glacier termination types cause differences in the glacier retreat ***-terminated glaciers retreated faster than land-terminated glaciers,and the type of glacier termination has a greater effect on the retreat rate than the size of the glacial area.

关键词： glacier glacial lake climate change northern tianshan mountains

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Tree-ring response to snow cover and reconstruction of century annual maximum snow depth for northern tianshan mountains, China

Tree-ring response to snow cover and reconstruction of centu...

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中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Li Qin Yujiang Yuan Ruibo Zhang Wenshou wei Shulong Yu Ziang Fan Feng Chen Tongwen Zhang Huaming Shang Institute of Desert and Meteorology China Meteorological Administration/Xinjiang Laboratory of Tree Ring Ecology/Key Laboratory of Tree-ring Physical Chemical ResearchChina Meteorological Administration

Heavy snowfall and extreme snow depth cause serious losses of human life and property in the northern tianshan mountains almost every *** cover is an important indicator of climate *** this study,we developed five tree-ringwidth chronologies of Schrenk spruce（Picea schrenkiana *** Mey） from the northern tianshan mountains using standard dendrochronological *** analyses indicated that radial growth of trees in the northern tianshan mountains is positively affected by annual maximum snow *** relationship was validated and models of annual maximum snow depth back to the 18 th century were *** reconstruction explains 48.3% of the variance in the instrumental temperature records during the 1958/59–2003/04 calibration *** indicates that quasi-periodic changes exist on 2.0–4.0-yr,5.3-yr,14.0-yr,and 36.0-yr *** reconstructed series shows that maximum snow depth exhibits obvious stages change,the periods characterized by lower maximum snow depth were 1809/10–1840/41,1873/74–1893/94,1909/10–1929/30,1964/65–1981/82,and the periods characterized by higher maximum snow depth were 1841/42–1872/73,1894/95–1908/09,1930/31–1963/64,and 1982/83–*** lower period of annual maximum snow depth during the 1920 s–1930 s is consistent with the severe drought that occurred at this time in northern *** the 1970 s to the present,the maximum snow depth has increased clearly with the change to a warmer and wetter climate in *** reconstruction sheds new light on snow cover variability and change in a region where the climate history for the past several centuries is poorly understood.

关键词： northern tianshan mountains reconstruction tree-ring maximum snow depth

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