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一旦高原进入冰冻圈或冰川规模达到最大,高原的反照率和冷源作用将会大大增强,对亚洲季风环流和全球气候都会产生很大的影响。因此,青藏高原何时进入冰冻圈和高原上最大冰期发生于何时,是冰川学和全球变化研究中两个非常关键的问题。施雅风等通过对大量资料的综合推导,认为最大冰期出现时间相当于深海氧同位素18～16阶段(0.72～0.52 MaBP),但是何时进入冰冻圈至今仍无确切证据。本文根据目前所知青藏高原上最厚的甘孜黄土剖面最新磁性年代和石英砂类型分析资料,对上述问题进行探讨。
Once the plateau reaches the cryosphere or the glacier reaches its maximum scale, the Altiplano’s albedo and cold source will greatly enhance its impact on the Asian monsoon circulation and the global climate. Therefore, when the Qinghai-Tibet Plateau enters the cryosphere and the maximum glaciation on the plateau occurs, it is two very crucial issues in the study of glaciology and global change. According to the comprehensive derivation of a large amount of data, Shi Ya-feng et al. Think that the appearance time of the maximum ice age is equivalent to the 18th ~ 16th stage of the deep sea oxygen isotope (0.72 ~ 0.52 MaBP), but there is still no definite evidence when entering the cryosphere. In this paper, based on the latest magnetic age and quartz sand type analysis data of Ganzi loess section, the thickest in the Qinghai-Tibet Plateau, the above problems are discussed.