梅汛期中的暴雨和大暴雨环流特征及物理量诊断分析

271Vol.27,No.120072SCIENTIAMETEOROLOGICASINICAFeb.,2007(,210008)2003,,,12,P458A:2005211214;:2006201224:(:40475017):(19572),(),,,,,E2mail:[e-mail],,,,,[1][2],,[3],2003621,712,22d12,,57%,11,219541991,75,2003,2003207205,2003:,,120031.12003,,1.2,(),,2003,1.32003500mm,3,45(),,6600mm,,672mm1.4200312d,,2d,,220032.1,2003621,500hPa120E2017N22N,,120E1727N(1),5882832N,588,222629,9120E2427N,200310721707214500hPa120E(621,712)Fig.1Thetrendsofsubtropicalridgealong120Eat500hPafromJune17toJuly14(beginningoftheMeiyuperiodonJune21,endoftheMeiyuperiodonJuly12)2.22003,,12500hPa9,,,2.32003,,73,,850hPa2.4,,2003,1210,32003753.12003752003,,,,18,,24h238.2mm,(2)3.275,08,14,20850hPa700hPa42003754.1500hPa31275500hPa,:120E341:207205T05-06T0505h(:mm)Fig.2Therainfallat0500fromJuly5toJuly6(unit:mm)3(a)75(b)500hPa850hPa(,12m/s,,14m/s,,)Fig.3The500hPacirculationandthe850hPajetflowofcompositeaverageofrainstorm(a)andheavyrainstormonJuly5(b)(theshadeiswindspeed12m/s,theblackshadeiswindspeed14m/s,thesolidlinesaretrough2lines,thedashlineissubtropicalridge)26N,586,,,,,:a,75,,7575500hPa4.2,;;3850hPa12m/s,3a3b-,3a,;3b,,14m/s()4427,(),,,,,,,,,52003754(a)7.5(b)(:10-7g/cm2hPas)Fig.4Themoisturefluxdivergenceofcompositeaverageofrainstorm(a)andheavyrainstormonJuly5(b)(unit:10-7g/cm2hPas)5.1,4754a,,-1510-7g/(cmhPas);4b75,,32N,08,-3010-7g/(cmhPas),850hPa(3b),,,,75,5.2EE=se850+se700+se500-3273.16,5abE75E,E3132N,,200210,75,220,101575629,,,E,E756200375200375,T21332N756.1(),118E,,800541:5(a)E7.5(b)E(:C)Fig.5TheE2indexofcompositeaverageofrainstorm(a)andheavyrainstormonJuly5(b)(unit:C)880hPa,2610-6/s460hPa,200150hPa,-4810-6/s7.5,10,700hPa,7010-6/s,4410-6/s6010-6/s770hPa640hPa,,400hPa,250hPa,-7510-6/s,2710-6/s75(2),,32N,75118120E,,700hPa,114E,118121E,5,508,,,,,,6(a)75(b)(:10-6/s)Fig.6Thecross2sectionofperpendiculardivergenceofcompositeaverageofrainstorm(a)andheavyrainstormonJuly5(b)(unit:10-6/s)64276.2(6b),32N,118E,75,400hPa,500hPa,-810-6/s;,100200hPa,1210-6/s75(6b),117122E,,500hPa,920850hPa,-3010-6/s200300hPa,4510-6/s,,,:,,400500hPa6.3:,,118E,,500hPa,-2510-3hPa/s75,118121E,,,500hPa,-11010-3hPa/s,,7(1),,,(2),,75(3),,,,:75(4),,500hPa,,,,,,75E,1015(5)200375,,75500hPa,,75,,,,754410-6/s,400hPa,,,300hPa,,,7511010-3hPa/s,82003:,,,,741:[1]..:,1980:1022111.[2]..:,2000:60265,2612264.[3],,,.,,1997,17(3):2212229.[4],,,.1997.,2000,20(1):79289.DIAGNOSISOFSYNOPTICSITUATIONANDPHYSICALVARIABLESOFRAINSTORMANDHEAVYRAINSTORMINMEIYUSPERIODYinDongpingHuLuolinZengMingjianTaoMeiXuHuiru(JiangsuMeteorologicalObservatory,Nanjing210008)AbstractTheheavyrainisfrequenteventduringtheMeiyuperiodof2003inJangsu.Thetotalpre2cipitationofmostareaarefarmorethanpreviousoneinhistory.ThisarticleaimsatthestudyofdifferentcharacteristicofthecirculationandphysicalvariablesbetweentherepresentativeandaveragefieldinMeiyu’heavyrainbyusingthemethodofcomparativeanalysis.Basedontheresult,itisconcludedthatthein2creaseofheavyrainalldaylongisrelatedwiththeincreaseofphysicalvariables.KeywordsMeiyuperiodHeavyrainDiagnosisanalysesPhysicalvariables8427