Duststorm Events in Kekexili Area, Northern Tibetan Plateau  During the Past 4000 Years: 〖WTBZ〗Evidence from Grainsize  Analysis of Lacustrine Sediments in Kusai Lake

Key words: 
• Kusai Lake /
• grainsize characteristics /
• duststorm events /
• Asian Monsoon /
• Northern Tibetan Plateau

Abstract: Based on the analyses of grainsize characteristics for lacustrine sediments in Kusai lake, compared with grainsize characteristics of trapped aeolian dust, the results indicate that the coarse grain component(>64 μm) are carried by wind action, recording the duststorm history of this area. The reconstructed duststorm sequence show: 2 500～800 cal aBP was the period with the highest frequency for duststorm events, while during 4 000～2 500 cal aBP and 800～0 cal aBP the frequency were lower correspondingly; and the duststorm events in the past 1 000 years were concentrated in the three cooling events stages of LIA. Comparative analysis with oxygen isotope records from Dongge Cave reveals that the climatic evolution of Kusai Lake area can be effected by the Asian Monsoon during the past 4 000 years, and the duststorm events occurred frequently during the colddry climate due to the decreased Summer Asian Monsoon.