我國南部夏季持續(xù)性暴雨的時空變化及其對應的環(huán)流特征.pdf

1、南京信息工程大學碩士學位論文我國南部夏季持續(xù)性暴雨的時空變化及其對應的環(huán)流特征姓名：許艷峰申請學位級別：碩士專業(yè)：氣象學指導教師：孫照渤20080401AbstractBasedonthedataofdailyprecipitationat734stationsinChinathispaperstudiesthespatial—temporalfeaturesofthepersistentheavyrainfallinthesoutho

2、fChinainSummer(AMJ)during19562005ByusingthemethodofEmpiricalOrthogonalFunction(EOF)，thedistributionfeaturesofthepersistentheavyrainfallinthesouthofChinainSummerisdividedintothreemodes，andthecorrespondingcirculationfeatur

3、estothethreemodesarealsoanalyzedwithcompose—analysisThelastpartstudiessomecasestodiscusstherelationshipbetweenthecharacteristicofOkhotskBlockingHigh’SmovementandthepersistentheavyrainfallovertheMiddleandLowerreachesofthe

4、YangtzeRiverinJulyThemajorconclusionsare：(1)ThespatialtemporaldistributionofthepersistentheavyrainfallinthesouthofChinainSummerisunevenThereisanobviousdecadalchangeintheMiddle—LowerReachesofYangtzeRiverthetimesofthepersi

5、stentheavyrainfallincreasedobviouslyinthe1990s；ButintheSouthChinaregion，particularlyalongthesoutheastcoastofGuangdong，thetimesofpersistentheavyrainfallarerelativelystable(2)Thedistributionfeaturesofthepersistentheavyrain

6、fallinthesouthofChinainSummercouldbedividedintothreemodes：ThefirstisConsistentMode，anditmainlyshowsthatthedepartureofthepersistentheavyrainfall’SdailymeanprecipitationdistributesintheeastofGuangdongprovinceandthewestofFu

7、jianprovinceisidentical；ThesecondisTransmeridional—AlternateMode，anditmainlyshowsthatthedeparturesinthemiddleofGuangxiprovince，inthesoutheastofGuangdongprovinceandintheeastofJiangxiprovincearedistributedaspositivenegativ