首页|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

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

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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.

glacier extensionglacier equilibrium-line altitudesYarlung Zangbo Downstream Basinsoutheast-ern Tibetan Plateauhigh-resolution paleoclimate simulations

LI Hao、LIU Shuang、HU Kaiheng、ZHANG Xiaopeng

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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

Second Tibetan Plateau Scientific Expedition and Research Program(STEP)Key Research and Development Program of Xizang Uygur Autonomous RegionNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2019QZKK0902XZ202301ZY0039G423051789174720741790434

2024

10.1007/s11442-024-2243-x

地理学报(英文版)
中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCD
影响因子：1.307
ISSN：1009-637X
年,卷(期)：2024.34(6)