CAJ | 학술논문

应用常规观测资料,NCEP1°×1°资料,静止卫星FY-2C红外云图和多普勒雷达资料,分析了2011年2月25—28日喀什地区暴雪天气的成因.结果表明:此次暴雪是在冬季显著变暖的背景下,由中亚低槽、萨彦岭低涡共同影响造成的喀什地区范围广、强度大的大降雪过程.中亚低槽先加深、后减弱北收持续影响是喀什长时间降雪的主要原因.暴雪过程中有明显的低层辐合、高层辐散及低空偏东急流;高空西南气流、低层持久的偏东急流为大降水提供了充足的水汽.多普勒雷达的反射率因子回波图上表现为强的东西入流辐合区,平均径向速度图上也有明显的呈"S"形的零速度线,表明雷达上空风随高度顺转有暖平流存在.
응용상규관측자료,NCEP1°×1°자료,정지위성FY-2C홍외운도화다보륵뢰체자료,분석료2011년2월25—28일객십지구폭설천기적성인.결과표명:차차폭설시재동계현저변난적배경하,유중아저조、살언령저와공동영향조성적객십지구범위엄、강도대적대강설과정.중아저조선가심、후감약북수지속영향시객십장시간강설적주요원인.폭설과정중유명현적저층복합、고층복산급저공편동급류;고공서남기류、저층지구적편동급류위대강수제공료충족적수기.다보륵뢰체적반사솔인자회파도상표현위강적동서입류복합구,평균경향속도도상야유명현적정"S"형적령속도선,표명뢰체상공풍수고도순전유난평류존재.
Applicating the conventional observation data, NCEP1° ×1° information, geostationary satellite FY-2C infrared imagery and Doppler radar data, authors analyzed the causes of heavy snow in Kashi prefecture in February 25th-28th, 2011.The results showed that:the blizzard is a wide range and high intensity of large snowfall process influenced by significant warming in winter background,central-Asia low trough and Sayan vortex.The low trough in central Asia weakened and stopped in north,after deepening.Sustained impact is mainly due to prolonged snowfall in Kashi prefecture.There are significant low-level convergence, upper divergence and low-level easterly jet in the progress of blizzard. Latitude southwest flow, the underlying persistence easterly jet stream provided sufficient moisture to the heavy rain.In the Doppler radar reflectance factor echocardiogram shows the strong east-west inflow convergence zone,average radial velocity chart also showed significant S-shaped zero speed line,which presented wind with height clockwise over radar had warm advection.