摘要
应用湿位涡理论 ,对发生在山东境内由台风和台风减弱的低压引发的两场大暴雨过程进行诊断。结果表明 :这两场暴雨都产生在θe 陡立密集区附近 ,θe 陡立密集区附近易导致湿斜压涡度发展 ;对流层中低层MPV1 <0 ,850hPa上MPV2 >0 ,综合反映了暴雨区对流不稳定和斜压不稳定的发展 ;对流层高层高值湿位涡下传 ,有利于位势不稳定能量的储存和释放 ,使降水增幅。
By using the theory of moist potential vorticity(MPV),the characteristics of MPV are analyzed in the process of two rainstorms caused by typhoon or weaken typhoon circulation in Shandong Province. The results show that the two heavy rain events occurred in the very stiff and dense section of moist isentropes, which can lead to the development of moist slantwise vorticity. MPV1<0 and MPV2>0 in the low troposphere reflect the development of convective and baroclinic instability . The downward spread of high from the upper troposphere is also of an advantage to the release and deposit of instability energy and the results in the amplification of rainstorm.
出处
《气象》
CSCD
北大核心
2004年第4期15-20,共6页
Meteorological Monthly
