2023年全國(guó)碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、ClimaticCharacteristicsandCausesofPersistentExtremeHighTemperatureEventsinSouthChinaMajor：MeteorologyName：FangYulingSupervisor：JianMaoqiuAbstractTheclimaticcharacteristicsandcausesofpersistentextremehightemperatureevents

2、from1961to2004inSouthChinawereanalyzedwithstatisticandgeneralcirculationdiagnosismethodsTheresultsareasfollowsTherearemorefrequentpersistentextremehightemperaturedays(PEHTD)occurredinthewesternpartofGuangxiprovinceandthe

3、northempartofFujianprovinceThereexistsignificantlyinphaseinterannualvariationsinthePEHTDinSouthChinainJuneJulyandAugustrespectivelyInJune，theinterannualanomalouscenterofPEHTDismainlylocatedinthewesternGuangxi，andthecente

4、rsinJulyarelocatedinthenorthernpartsofFujianandGuangdongInAugustthePEHTDanomalouscentersareinnorthernGuangdongandcentralandeasternGuangxiInsummerundertheweatherconditionofpersistentextremehightemperatureevents，theSouthAs

5、iahighisoftenintensifiedandthewestemPacificsubtropicalhighisalsointensifiedandextendswestwardAtthesametimethesouthwesterliesofsummermonsoonseemsweakerandtherearetropicalcyclonesandtropicaldisturbancesinthevicinitiesofBal

6、intangchannelBasedonthestatisticresultitisfoundthatfortyninepercentofPEHTDareduetotheinfluenceofthesubtropicalhighorcontinentalhighandtheotherfortyfivepercentarelinkedtotheinfluenceoftropicalcyclonesandtropicaldisturbanc

7、esmainlyfromthetropicalwesternPacificThebackgroundcirculationcharacteristiesforinterannualvariationofPEHTDwerealsoanalyzedTheinterannualvariabilityofPEHTDinJunehasacloselyrelationwiththetroughactivitiesaroundtheareafromH

8、uabeitotheYellowSeaat500hPaThenorthemcoldaircannotreachSouthChinawhenthetroughdisturbancesareinactiveinaforementionedregionaccompaniedwiththeintensifiedgeopotentialheightThiswillbebenefittotheoccurrenceofpersistentextrem

9、ehightemperatureeventsThesituationisreversedinthecaseofactivetroughdisturbancesBothinJulyandAugust。thePEHTDsinSouthChinahavesignificantpositivecorrelationsoninterannualscalevariationwiththe500hPaheightovertheSouthChinaan

10、dtheBayofBengalUsuallythereexistanticyclonicanomalouscirculationsoverSouthChinaandcyclonicanomalouscirculationsoverthetropicalwesternPacificat850hPainthecaseoffrequentlyoccurringPEHTDbutanticyclonicanomalouscirculationso

11、verthetropicalwesternPacificinthecaseoflessPEHTDFinallybasedonthediagnosisofapersistentextremehightemperatureeventin2003，itwasfoundthattheneteffectofverticaltemperatureadvectionprocessanddiabaticheatingatthelowertroposph

12、erehasamajorcontributiontothelocaltemperaturerisingwhilethehorizontaltemperatureadvectionprocesshasanegativecontributionThereexistsasignificant60120daylowfrequencyoscillationintheseasonalvariationofdailymaximumtemperatur

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