Variation of East Asian Summer Monsoon and Its Relationship withPrecipitationofChinainRecent111Years

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1、AgriculturalScience＆Technology，2011，12(11):1711－1716Copyright2011，InformationInstituteofHAAS．Allrightsreserved．ResourcesandEnvironmentVariationofEastAsianSummerMonsoonandItsRelationshipwithPrecipitationofChinainRecent111Years*YANGHao，ZHIXie-fei，GAOJie，LIUYingKeyLaboratoryofMeteorologi

2、calDisasterofMinistryofEducation，NanjingUniversityofInformationScience＆Technology，Nanjing210044AbstractBasedonthemonthlyaverageSLPdatainthenorthernhemispherefrom1899to2009，EastAsiansummermonsoonintensityindexinrecent111yearswascalculated，andtheinterdecadalandinterannualvariationcharact

3、eristicsofEastAsiansummermonsoonwereanalyzed．TheresultsshowedthatEastAsiansummermonsooninthe1920swasthestrongest．TheintensityofEastAsiansummermonsoonafterthestmiddleperiodofthe1980spresentedweakenedtrend．Itwastheweakestintheearly21century．Morletwaveletanalysisfoundthattheinter-decadala

4、ndinterannualvariationsofEastAsiansummermonsoonhadquasi-10-yearandquasi-2-yearsignificanceperiods．Theinterannualvari-ationofprecipitationintheeastofChinacloselyrelatedtointensityvariationofEastAsiansummermonsoon．Instrong(weak)EastAsiansum-mermonsoonyear，therainfallinthemiddleandlowreac

5、hesofYangtzeRiverwasless(more)thanthatincommonyear，whiletherainfallinNorthChinawasmore(less)thanthatincommonyear．TheweakeningofEastAsiansummermonsoonwasanimportantreasonforthatitwasrainless(drought)inNorthChinaandrainy(flood)inthemiddleandlowreachesoftheYangtzeRiverafterthemiddleperiod

6、ofthe1980s．KeywordsEastAsiansummermonsoon;Variation;PrecipitationofChinaThemonsoonisimportantcomponentofgloballarge-rongetal．usedeast-westandsouth-norththermodynamicscalecirculationsystem．Generallyspeaking，themonsoondifferencesbetweenoceanandlandtocomprehensivelyde-formationcloselyrela

7、testoseasonalvariationofthermody-fineanEastAsianocean-landthermodynamicdifferencein-［13］namiccirculationbetweenoceanandland．Theobservationdex．ThemonsoonindicesobtainedbydifferentdefinitionfactandresearchshowthatAsianmonsoonzoneisthemostmethodshadtheirowncharacteristicsonreflectingsum