長江流域持續(xù)性暴雨過程與前期全球海溫場的相關(guān)分析.pdf

1、浙江大學理學院碩士學位論文長江流域持續(xù)性暴雨過程與前期全球海溫場的相關(guān)分析姓名：孫志章申請學位級別：碩士專業(yè)：氣象學指導(dǎo)教師：湯燕冰20090505⑨浙江大學碩Ij學位論文長江流域持續(xù)性暴雨過程與前期傘球海溫場的相關(guān)分析AbstractBaseduponidentifyingthepersistentheavyrainfallevents(thePHRevents)duringtheperiodof1982—2004andwinddat

2、a，geopotentialheightdata，temperaturedataandtheSeaSurfaceTemperature(SST)datafromNCEP／NCAR，therelationshipbetweenthePHReventsinYangtzeRiverbasinandtheglobalSSTinprecedingtimeisanalysised，andthepossiblemechanismofeffectsof

3、SSTAonthePHReventsinYangtzeRivervalleyisdiscussedConclusionsareasfollows：(1)The4thweekbeforethePHR，thekeyareaoftheSSTinfluencingonthePHRoverYangtze—HuaiheRivervalleyandYangtzeRivervalley(YHYZ)liesinequatorialeasternPacif

4、ic，abitNorth；the2thandlthweekbeforethePHR，itliesinequatorialIndianOcean，abitSouthThe4thweekandthe3thweekbeforethePHRevents，thekeyareaoftheSSTinfluencingonthePHRovertheSouthoftheYangtzeRiver(YS)liesinequatorialeasternPaci

5、fic；andthelthweekbeforethePHRevents，itliesinequatorialIndianOcean(2)ThePHReventsoverYH—YZandYSareinfluencedbytheWesternPacificSubtropicalHighandthe850hPasouthwestwind(3)TheequatorialeasternPacificSSTisathighandthewestemP

6、acificSSTislowbeforePHReventshappensatYHYZandYS，reducedtheairflowraisingattheequatorialeasternPacific，eastflowweakenedandprevalencingsubsidingflowatPhilippinesTheintensityandpositionofSubtropicalhighinWesternPacificimpac

7、ttheSouthwestflowatthenorthwestofSubtropicalhighinWesternPacificThatmakesthewarmandwetairreachtheⅧYZandYS，thenthePHReventshappenedBesides，theequatorialsouthernIndianOceanSSTiswarmerbeforethePHRevents，theairseainteraction