Primary study on pattern of general circulation of atmosphere before uplift of the Tibetan Plateau in eastern Asia

The Tibetan Plateau is a key factor for the pattern of the general circulat ion of the atmosphere (GCA) in eastern Asia. The pattern of the GCA after t he uplift of the plateau is well known, while the pattern of the GCA before the uplift of the plateau is lack of direct evidences. Based on the knowab ility of desert, a section recording wind directions across the Cretaceous northern hemisphere mid-low latitude desert belt is measured and the patter n of the GCA in the Cretaceous is revealed. The result shows that the easte rn Asia was really controlled by the planetary circulation before the uplif t of the plateau, i.e. westerlies in the north and northeast trades in the south. The convert belt between westerlies and trades had drifted northward s and southwards. The possibility of existence of paleo-monsoon is also dea lt with and a possibly imposed paleo-monsoon is suggested.