The Estimation of Rainstorm Forecast Skill along Yangtze Valley through Atmospheric 'Strong Signal' Area Data Assimilation in Key Area on Tibetan Plateau

摘要

@@ 1 Introduction Tibetan Plateau has al ways been re ferred to as "roof of the worl d". It is the I argest and highest plate au in the world. Because of its unique topographic feature, Tibetan Plateau (TP, briefly) plays an im portant and special role in the global atmospheric energy and hydrologic al cycles. Some Rese arch indicates that as the lar gest and highest plateau in the world, TP has become an abnorm al key area of water vapor transport with great triangle shape, which encompasses the abnormally rem arkable warm an d wet air -flow and the transport of water vapor com ing from the southern India n Ocean, South-China Sea, and the low-latitude pacific, effected by the dy namic- and heating influence. Furtherm ore, it has been documented that the key regions of occurrence of floo ding and drought in the East Asia particularly in the Y angtze River valley, present a great deal of sensitivity to the anom alies in the water vapor distribution in this great triangle region. Because water vapor converges and t ransports to the east, Tibetan Plateau serves not only as a water -vapor pump, but also acts as "a water storage and rechannel station".