青藏高原中东部最大冰期时代高度与气候环境探讨

Studies on Altitude and Climatic Environment in the Middle and East Parts of Tibetan Plateau during Quaternary Maximum Glaciation

本文应用不同来源的各种资料，经逐步综合推导，认为最大冰期出现时间相当于深海氧同位素１８－１６阶段（０．７２－０．５２ＭａＢＰ），当时青藏高原低于现代１０００ｍ左右。高原中、东部唐古拉山、阿尼玛卿山、果洛山与稻城海子山４个山区的冰川面积达４００００ｋｍ２，为现代冰川面积的１８倍，平衡线高度为３４５０－Ｍ２５０ｍ，６－８月平均温度为２．３－３．４℃，年降水量为１２６０－１９６０ｍｍ，是现代平衡线上降水量的１．８－３．２倍。

A wide variety of informations is used in this paper to comprehensively infer the altitude and climatic environment during Quaternary maximum glaciation. It is suggested that the time of Quaternary maximum glaciation appearance is in correspondence with the deep sea core oxygen isotopic stages 18-16(0.72-0.52MaBP). At that time the height of the Plateau was approximately 1000 m lower than that at present, the total glacierized area of four major mountain ranges (Tanggula, A'nyemaqen, Golog and Daocheng Haizi) in the middle and east parts of the plateau was 40000km￣2, 18 times larger than that at present, the eqilibrium line altitude varied from 3450 to 4250 m, the average air temperature from June to August varied from 2.3 to 3.4℃ , and the annual precipitation varied between 1260 and 1960 mm, 1.8to 3.2 times more than that at present at the equilibrium line altitude.