Glacier extent changes and possible causes in the Hala Lake Basin of Qinghai-Tibet Plateau Glacier extent changes and possible causes in the Hala Lake Basin of Qinghai-Tibet Plateau

最小化 最大化

Vol16 No.7: 1571-1583

Title】Glacier extent changes and possible causes in the Hala Lake Basin of Qinghai-Tibet Plateau

Author】LI Dong-Sheng1; CUI Bu-Li1,2,3*; WANG Ying1; XIAO Bei1; JIANG Bao-Fu1

Addresses】1 School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China; 2 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China; 3 State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

Corresponding author】CUI Bu-Li

Citation】Li DS, Cui BL, Wang Y, et al. (2019) Glacier extent changes and possible causes in the Hala Lake Basin of Qinghai-Tibet Plateau. Journal of Mountain Science 16(7). https://doi.org/10.1007/s11629-018-5198-5

DOI】https://doi.org/10.1007/s11629-018-5198-5

Abstract】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 from 106.24 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 continuallyas a result of global warming on the Tibetan Plateau.

Keywords】Glacier extent; Climate change; Hala Lake Basin; Qinghai-Tibet Plateau