末次冰盛期雅鲁藏布江下游冰川物质平衡线高度变化的空间差异性  

Differential depression of the glacier equilibrium-line altitudes in the Yarlung Zangbo Downstream Basin in the Last Glacial Maximum compared to the pre-industrial era

作　　者：李豪 刘双 胡凯衡 张晓鹏 LI Hao;LIU Shuang;HU Kaiheng;ZHANG Xiaopeng(State Key Laboratory of Mountain Hazards and Engineering Resilience,Institute of Mountain Hazards and Environment,CAS,Chengdu 610299,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]State Key Laboratory of Mountain Hazards and Engineering Resilience,Institute of Mountain Hazards and Environment,CAS,Chengdu 610299,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Geographical Sciences》2024年第6期1157-1173,共17页地理学报（英文版）

基　　金：The Second Tibetan Plateau Scientific Expedition and Research Program (STEP),No.2019QZKK0902;Key Research and Development Program of Xizang Uygur Autonomous Region,No.XZ202301ZY0039G;National Natural Science Foundation of China,No.42305178, No.91747207, No.41790434。

摘　　要：Glaciers in the Yarlung Zangbo Downstream Basin(YZDB) are sensitive to global climate change. The equilibrium-line altitude(ELA) is a key indicator of glacial development.Current models for simulating the meteorological ELA underestimate the extent of glacial advance during the Last Glacial Maximum(LGM) in the YZDB and cannot explain the large-scale glacial extension compared with the Yarlung Zangbo Midstream Basin(YZMB). In this study, the distribution of ELA in the LGM is reconstructed using high-resolution 80-km ECHAM5 simulations and empirical relationships between temperature and precipitation.Changes in ELA between the LGM and pre-industrial era(PI) are compared. Our simulated ELA closely fits the published field data. In the YZDB, simulated LGM ELAs range from ca.3500 m to over 4900 m, representing declines of ca. 300–950 m. The ECHAM5 simulations better reflect the complex topographic features than most coarse-resolution climate models,and the ELA distribution is controlled by the spatial arrangement of river valley systems and mountain ranges and their impact on precipitation. Compared with the PI era, most of the monsoon precipitation in the LGM was concentrated in the YZDB, which is the main driver of glacial extension and the differential response of the downstream and midstream basins.

关 键 词：glacier extension glacier equilibrium-line altitudes Yarlung Zangbo Downstream Basin southeastern Tibetan Plateau high-resolution paleoclimate simulations 

分 类 号：P343.6[天文地球—水文科学]