台风活动对华北汛期降水影响的的研究 (1)

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1、鱼墨重塾型望j!亟塑堕查墅堕盟婴壅AbstractThecharacteristicoftropicalcycloneactivityishotspotinternationTCstudyfiledontheglobalclimatewarmingbackground．TCrainfallisaimportantpartoftyphoonactivity．usingtheNCEP／NCARmonthlymeKnreanalysisindexofsubtropicalhi曲andAsiapolarvortexandrainfallandtyphoonpre

2、cipitationof1957—2002overNorthCn／hainrainyseason,aleemployedtodiagnoseandanalyzethetyphoonactivityeffectonfloodseasonrainfallthefeatureofspatialandtemporaloftyphoonrainfallanditcontributiontofloodseasonprecipitation,andthedifferentcharacteristicsofcimulation：1．RainfallofNorth-Chi

3、naisdisplayingdecreasestremi．Ralnf班lofNorth-Chinaandthe丘equencyoflanaingtyphoonarepositively(negatively)correlatedinmostpartsofcentralandeastern(southern)ofNorth-China．Notonlythefeatureofsealevelpressureand850hpaslreamlineanomalyfieldbutalsothecharacteristicof500hpaheighanomalyfi

4、eldandcoldairtrackckculafionaresimilartoeachotherduringyearsofmore(1ess)、activetyphoonandmore(1ass)rainfalloverthecentralandeastareasofNorth-China．2．Typhoonnumberinfloodseasonisdisplayingdecreaseinthe46years，ithaspara-periodof1I,and．2years．1967isthecatastrophepointatwhichthefi'eq

5、uencyoftyphoonbeginsadownwardtendency．EffectsOnNorthernChlna,rainfalltyphoonlandsattwokeyareasofCoastalShangdongandHualian-Y『ilanofTalwan．3．Typhoonrainfallingoffloodseasonisgraduallyfallinginthepast46yearsandconsistentwi血apara-period2．-3years．Thetyphoonrainfalldecreasefromsouth—e

6、asttonorth-west,thereliefmakeeffectmorecomplication．4．NotonlyoveralltyphoonrainfallcontributionrateandJulydisplayingdecrsaesbendinpast46yearsbutAugustisincrcase．Thehi、ghvalueofrainfallinAugustCOVerSallareae硪endingtowestandnorth,andisapparanflyhigherthanthatinJuly,especiallyinHena

7、nprovinceofeastofTallmugMount．5．Thenotabledifferenceofsealevelpmssureinhigh(10w)-precipitationseasonscanbefoundfromBai]kallaketoOldaotsksea,Japaneseislands,fromSouthChinaseatoeastemPtfilippines；asforthe850hpazonal(meridional)wind，itdifferentiatesalotatnorth*eastofNorthChinatonort

8、hofKoreaPeninsulaandJapanSea,EastSeaandw