Some researcher thought, northern boundary of the Asian monsoon moved in geological age and northward covered the entire northern Chinese mainland, including northwestern China, during the last deglaciation and optimum Holocene.

Some researcher thought, different Asian regions have been dominated by westerlies and monsoons, respectively, e.g. the arid central Asia and monsoonal Asia. In its region, the climate was dominated by one air circulation experienced synchronous and coherent moisture changes during the Holocene.

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