摘要
A salient feature of the East Asian orography is the huge Tibetan Plateau in the west and the broad Pacific in the east.Reversals in the temperature gradient between the Eurasian continent and the adjacent Pacific Ocean associated with the progression of the seasons have produced the prominent East Asian monsoon system.The summer monsoon contributes about 49%of the annual precipitation over East Asia.Anomalous monsoon activities have and will continue to affect more than one billion people living in this area(Zhou TJ et al.,2009,2011).
