摘要
Aheavyrainfallassociatedwiththedeepeningofamonsoondepressionhappenedinthesummerof2005.Thisprocesswasfirstdiagnosticallyanalyzedandthe3Dstructureofthemonsoondepressionwasdiscussed,thenthisstructurewascomparedwiththoseofthemonsoondepressioninSouthAsiaandthelowvortexintheMeiyufront.TheresultsshowedthattheheavyrainfalldirectlyresultedfromamonsoondepressioninSouthChina,andthelarge-scaleenvironmentprovidedafavorablebackgroundforthedeepeningofthemonsoondepression.The3Dstructureofthemonsoondepressionwasasfollows.Inthehorizontaldirection,thereexistedaconvectivecloudbandtothesouthofthemonsoondepression,whichlayinaconvectivelyinstablearea,witharelativelystrongascendingmotioninthemidandlowlevelsofthetroposphere,andtheascendingmotionmatchedwellwithamoisttongue,aconvergencearea,andabandofpositivevorticityinthemidandlowlevelsofthetroposphere.Intheverticaldirection,thedepressionhadanobviouslycycloniccirculationinthemidandlowlevelsofthetroposphere,butnocirculationfromabove300hPa.Themonsoondepressioncorrespondedtoconvergenceandpositivevorticityinthelowlevels,buttodivergenceandnegativevorticityintheupperlevels.Theupwarddraftofthedepressioncouldreachtheupperlevelsofthetroposphereinthewestofthedepression,whilethedescendingmotionlayintheeast.Therewasalow-leveljettothesouthofthedepression,whiletheupper-leveljetwasnotobvious.Thedepressionwasverticallywarmintheupperlevelsandcoldinthelowlevels,andtheaxisofthedepressiontiltedsoutheastwardwithheight,whosecharacteristicsweredifferentnotonlyfromthemonsoondepressioninSouthAsiabutalsofromthelowvortexintheMeiyufront.
出版日期
2008年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
