四川康定折多山末次冰盛期古冰川重建及其气候意义

Zheduoshan Mountains is located in the eastern margin of the Qinghai-Tibet Plateau, in the transition zone from plateau to mountains and valleys, with well-preserved glacial landforms. It is of great significance to study the glacial landforms to reveal the coupling mechanism between the evolution of topography and paleoclimate change in the eastern margin of the Qinghai-Tibet Plateau. On the basis of field investigation, combined with Google Earth remote sensing image, The Second Glacier Inventory Dataset of China(Version 1. 0), glacial landforms and its characteristic parameters are identified and calculated. A total of 189 ancient glaciers were identified, covering an area of 497 km². Based on the available chronological data, the glacial landforms in the study area are mainly remains of glaciations since the last glacial maximum(LGM). The results show that the height of LGM glacier equilibrium line(ELA)is 4 380 m on the west slope and 4 110 m on the east slope, with a difference of 270 m, indicating that the east side of the watershed is more favorable for glacier development. The widely developed glacial lakes, glacial bedrock surface, roche moutonnée, etc. , and deep glacial trough (U-shaped Valley)indicate the characteristics of temperate(marine)glaciation;the positive glaciation amplitude, glacial valley orientation and erosion landforms reveal that the terrain conditions and water vapor sources in the accumulation area have an important impact on the development of glaciers in the study area.