亞洲夏季風(fēng)建立的季節(jié)進程及機理研究.pdf

1、分類號UDC密級編號亞洲夏季風(fēng)建立的季節(jié)進程及機理研究(南京信息工程大學(xué)理學(xué)博士學(xué)位論文)培養(yǎng)單位專業(yè)申請人指導(dǎo)教師直復(fù)焦墾三猩太堂氫基堂魚壺工二匯睫2006年5月Abstract111eseasonaiprocessandmechanismsofonsetoftheAsiansummermonsoonfireinvestigatedinthisstudyandtheconclusionsareasfollowed：1neearlies

2、tonsetoftheAsiansummermonsoonOccursoverthetropicaleasternIndianOceanwhichismainlycharacterizedbyastepwiseadvance，whichiscloselyrelatedtotheevolutionofthecross—equal_torialflowItwilprovideapreconditionfortheonsetandthenor

3、thwardadvanceofthesummerInonsoonoverthetropicaleasternIndian0ceanwhenthecross—equatorialflowstrengthenscontinuouslyandadvancesnorthwards，whichisrelativetothecyclonecirculationcausedbytheheatingofthestrongsurfacesensibleh

4、eatfluxovertlleIndianPeninsulaandthesurfacelatentheatfluxovertheoceantotheSOUthofitThecyclonecirculationisinfavorofthecontinuousintensificationofthesouthwesterlyoverthetropicaleasternIndianOceanbuthasanoppositeeffectonth

5、ecounterDartoverthetropicalwesternIndianOcearlfromtheendofMarchtolateMayandasaresultthecrossequatorialflow協(xié)kesplacetheearliestoverthetropicaleasternIndianOcean2Threestagesandtwoabruptiumpsexistintheclimatologicalonsetpro

6、cessofBayofBengal(BOB)summermonsoon：(1)onPentad23，westerlyandconvectionstarttobuildupinmesoutheasternpartofBOB，(2、whentheactiveconvectionemergesovertheIndochinaPeninsulaaffectedbytheverticalasymmetricheatingcausedbythegr

7、eatamountofcondensationlatentheatrelease，theBOBcyclonecirculationintensi母rapidlyaswellasthemoistureconvergesgreatlyintheBOB，whichresulISinⅡleactireconvectionoverthemostareasofmeBOBand血efirstjumpappearsonPentad28consequen

8、tly(3)InfluencedbytheonsetoftheIndiansuminermonsoon，thesecondjumpisfoundonPentad313neonsetofthevigorousconvectionoverlndochinaPeninsulaandjIsadjacentareasisofveryimportancetotheonsetoftheIndiansummermonsooILInconsequence

9、oftheactiveconvectionovertheIndochinaPeninsula，thedivergenceatupperlevelsovertheIndochinaPeninsulaSouthChinaSeaintensifiesandextends，thentheconvergencecenterovertheArabianSeaandtheArabianPeninsulacomestoawestwardshiftins

10、uchawaythesubsidenceintlletroposphereovertheArabianSeaweakens，sodoes也elowlevelanticyclonecirculationandthenortherlywind。whichmakesforthefastnorthwardsadvanceoftheSomaliietflowaftercrossingtheequatorWitilethesignificantIn

11、creaseofthevorticityontheleflsideoftheietflowisinfavoroftherapidintensificationoftheheatlowovertheArabianPeninsulaandtheloweringofthelow—levelgeopotentialhei【ghto、’ertheArabianSea，furthermore，theheatingfieldwimheatingatu

12、pperlevelsandcoolingatlowerlevelsovertheArabianSeaalsofavorstheloweringofthelowerlevelgeopotentialheightAffectedjointlybythefactorsmentionedabovetheIowlevelgeopotentialheight10wersovertheArabianSeathusthenegativemeridion