陜西渭北中尺度對流系統(tǒng)雷達觀測和數(shù)值模擬研究.pdf

1、南京信息工程大學碩士學位論文陜西渭北中尺度對流系統(tǒng)雷達觀測和數(shù)值模擬研究姓名：岳治國申請學位級別：碩士專業(yè)：大氣物理學與大氣環(huán)境指導教師：牛生杰20080501陜西渭北中尺度對流系統(tǒng)雷達觀測和數(shù)值模擬研究ABSTRCATBasedonthe711di西talweatherradardatainWeibeiareaofShaanxiProvincebetweenMayandSeptemberfrom2000to2006，335caseso

2、fmesoscaleconvectivesystem(MCS)wereclassifiedintothreeclasses(cell，linearandarealMCS)andninesubclasses(slightlymovingcell，movingcell，mergingcell，trailingstratiform(TS)，leadingstratiform(LS)，parallelstratiform(PS)，brokenl

3、inearbrokenarealandembeddedarealMCS)InthispaperthesummarycharacteristicsofeachMCSclasswerestatisticallyanalyzedwhichincludedfrequencydiurnalvariation，durationscaleandmovingspeedofechoByapplyingWRFmode，oncecaseofMCShappen

4、edonMay30。2005inWeibeiareaofShaanxiProvinceiSsimulatedandanalyzedbymicroph)rsitsscheme，ThompsonKesslerFerrierLin，WSM3，WSM5WSM6Theresultsshow：(1)ThearealMCSwasfoundtobethedominantmodeofallkindsofMCSorganizationtheisolated

5、eelland1inearMCScomposed53％ofthestudiedpopulationThefrequencyoftimesofMCSinitiationiSdisplayedthatmostofthesystemswereinitiatedbetween1lOOand2100BSTwhichcorrespondstotheaftemoonandeveninghoursoftheChinaThelinearMCScaseso

6、ccurredbetween1300and2100BSTwithasmallercaseinlinearMCSbetween0200and1200BSTThearealMCShaveoccurredanytimesinadaybutthemaininitialtimebetween1000andl700BSTneunmovingeellMCSwasthesmallestmeanduration(16h)andthesmallestmea

7、nscale(742km)inninesubcategories，andthenonembeddedarealMCSwasthegreatestmeandurationf44h)andthegreatestmeanscale(10298kin)ThemovingspeedoftheTSMCSwasthemostanaverageof33km／h(2)ThelinearMCSWasformedhallwithmaximumprobabil

8、ityandeellMCSwithminimumprobabilityandthatTSMCStendedtobringaboutsevereweatherdisasterandslightlymovingcellMCSproducelightdisaster(3)Thesimulatedresultsofsevenexplicitcloudmicrophysicalschemesa11showthatvirtualheavypreci

9、pitationcenterisappearinsouthofShaanxiprovinceandWSM6schemesimulatedcumulativerainfallandobservationrainfanof6hoursshowbestagreementinWeibeiareaandNorthofShaanxiprovinceSimulatedintensityandregionof6hourscumulativeralnfa

10、llbyeachschemeiSsimilarbuttherainregioniSsmallerinWeibeiareathanrealrainThompsonschemeiSbesttosimulate24hrainfallWSM6schemeiSbettertosimulatehourlyprecipitation(4)TheXi’anstationsoundingcurveofsimulationbyeachexplicitmic