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《JOURNAL OF GLACIOLGY AND GEOCRYOLOGY》 1997-02
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Glaciers and Environments during the Last Glacial Maximum (LGM) on the Tibetan Plateau

Shi Yafeng, Zheng Benxing and Yao Tandong (Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences,730000)  
It was 7℃ colder than present on the Tibetan Plateau during the Last Glacial Maximum (LGM) about 16~32 ka BP. Precipitation was 30%~70% of present in that time. Polar type glaciers developed extensively. The equilibrium line in the LGM was 500~300 m lower than present in the major interior part of the plateau, while a small number of temperate glaciers, subpolar type glaciers mjght exist in the eastern, southern and western edges of the plateau, with an ELA decrease of 800 m, even up to 1 000~1 200 m. According to preliminary statistics, the glaciated area on the plateau (including the surrounding high mountains) in LGM is about 350 000 km 2,7.5 times larger than at present, and the ice volume on the plateau at that time was estimated to be about 87 500 km 3 and equivalent to a decrease of 24.2 cm of the global sea level. Permafrost developed extensively to its maximum, about 2 200 000 km 2. Lakes in the eastern part of the plateau, which remarkably depended on the monsoon precipitation, shrank or even disappeared during the LGM, while those located in the northwestern part of the plateau got their level lower than that in former interglacial stadial and higher than that during the post glacial period due to the effect of the westlies. Almost all lakes on the plateau became more salted, and several salt lakes formed in the Qaidam Basin and in the plateau proper. The conifers and broad leaved forests withdrew to the southeast margin of the plateau, while the desert and steppe covered the most part of the plateau.
【Fund】: 国家自然科学基金会重点项目 国家科委攀登计划基金 中国科学院青藏项目
【CateGory Index】: P343.6
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