关键词: 柴达木盆地, 晚全新世, 风成地貌, 古风况, 东亚季风

Abstract:

Using remote sensing image for the aeolian morphology and high resolution ancient monsoon indicators, the authors restore how the wind blows in Qaidam Basin since late Holocene. The results show that the prevailing winds of the basin were northwest winds, at the same time there were a small amount of westerly and north wind, with the summer monsoon and westerly circulation having little effect on the wind models. The eastern dune and Yardang landforms of the basin recorded the westerly winds of the last glacial, but the landforms in the midwest indicated that the Asian winter monsoon developed from the northwest during late Holocene. The changes in the atmospheric circulation model took place around 4000 aBP years ago, which was an important node, basin climate shifting from warm and humid to cold and dry.

Key words: Qaidam Basin, late Holocene, aeolian bedform, paleowind direction, East Asian onsoon