Influence of the Convection over the South China Sea on the Summer Precipitation of Shandong Province-中国期刊网

摘要 ThepentadaverageminimumoutgoingIongwaveradiation(OLR)dataoverthenorthernSouthChinaSea(SCS)areselectedasindexestoanalyzetheintensityoftheconvectionconnectedwiththeSCSmonsoononset.StatisticanalysisdemonstratesthattheindexcanaccountfortheintensityoftheSCSmonsoonabout,atleast,75%.Asignificantnegativecorrelation(confidentlevelover90%)betweenShandong'ssummerrainfallandtheindexisfoundonlyintheperiodof24-26pentadsandlimitedtotheareaabovethedeeperwaterbasinoftheSCS(10°-20°N,110°-117.5°E).ThustheminimumOLRoverthedeeperwaterbasinduring24-26pentadscanbeusedasavaluablepredictorforthelong-leadforecastoftheprecipitation.The500hPageopotentialheightdataintheNorthernHemispherefortheperiodfrom1951to2000areusedinordertocharacterizethephysicalmechanismsinvolved.Thecompositeanomaliesofthe500hPalevelallowfortheidentificationanddetectionoftheteleconnectionoftheEastAsia-NorthAmerica(EAP)patternthatisresponsibletosomeextentfortheinterannualvariabilityoftheprecipitationofShandongProvince.Besides,theinterannualdifferencesoftheintraseasonalvariations(ISV)ofOLRandtheirnorthwardtransmissionprobablymakeacontributiontothepositionofthesubtropicalhighwhichisvitalforthesummerrainfallintheprovince.

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Influence of the Convection over the South China Sea on the Summer Precipitation of Shandong Province

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Influence of the Convection over the South China Sea on the Summer Precipitation of Shandong Province

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