current progresses in study of impacts of the tibetan plateau on asian summer climate

《current progresses in study of impacts of the tibetan plateau on asian summer climate》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、CurrentProgressesinStudyofImpactsoftheTibetanPlateauonAsianSummerClimateVOL.2ONo.2ACTAMETEoRoLoGICAsINICACurrentProgressesinStudyofImpactsoftheTibetanPlateauonAsianSummerClimatewuGuoxiong(吴国雄),MAOJiangyu(毛江玉),DUANAnmin(段安民),andZHANGQiong(张琼)StateKeyLabora

2、toryofAtmosphericScienceandGeophysicalFluidDynamics(LASG),InstituteofAtmosphericPhysics}ChineseAcademyofSciences}Beijing100029(ReceivedMay9,2006)ABSTRACTThecurrentprogTe88esinthestudyofimpactsoftheTibetanPlateauonAsiansummerclimateinthelastdecadearereview

3、ed.BYanalyzingevolutionofthetransitionalzonebetweenwesterlytothenorthandeasterlytothesouth(WEB),itisshownthatduetothestrongheatingovertheTibetanPlateauinspring,theoverturningintheprevailingwinddirectionfromeasterlyinwintertowesterlyinsummeroccursfirstlyov

4、ertheeasternBayofBengal(B0B),accompaniedwithvigorousconvectiveprecipitationtoitseast.Theareabetweene~ernBOBandwesternIndo-ChinaPeninsulathusbecomestheareawiththeearliestonsetofAsianmonsoon,whichmaybereferredasB0Bmonsooninshort.Itisshownthatthesummertimeci

5、rculationstriggeredbythethermalforcingoftheIranianPlateauandtheTibetanPlateauareembeddedinphasewiththecontinental-scalecirculationforcedbythediabaticheatingovertheEurasianContinent.Asaresult.theEastAsiansummermonsoonisintensifiedandthedroughtclimateoverth

6、ewesternandcentralAsianareasisenhanced.TogetherwithperturbationstriggeredbytheTibetanPlateau,theabovescenariosandtheassociatedheatinghaveimportantinfluencesontheclimatepatternsoverAsia.Furthermore,thecharacteristicsoftheTibetanmodeofthesummertimeSouthAsia

7、nhigharecomparedwiththoseofIranianmode.ResultsdemonstratethatcorrespondingtoeachofthebimodalityoftheSouthAsianhigh.therainfallanomalydistributionsoverAsiaexhibitdi舶rentpatterns.Keywords:theTibetanPlateauheating,westerly-easterly-boundary(WEB),Asianmonsoon

8、onset,cli-matepatternoverEastAsia.bimodalityoftheSouthAsianhigh1.IntroductionMostofpreviousstudiesfocusedonthemechani-calimpactoflarge-scaleorographyuponatmosphericcirculationandclimatebefore1950s.Basedonlin—earized