气象科学2012，Vol.32Issue(6)：609-621,13.DOI:10.3969/2012jms.0100
2010年5月6日重庆强对流过程的天气学分析
Synoptic analysis of the severe convection event on 6 May 2010 in Chongqing
摘要
Abstract
With the use of conventional observations, NCEP/NCAR reanalysis, FY-2E infrared satellite imagery, Doppler radar and automatic weather stations data, synoptic analysis is conducted of the severe convection event on 6 May 2010 in Chongqing, focusing on the evolutions of different weather systems and their interactions. A conceptual model of synoptic background for this case is proposed. The results show that this event occurred under the background that midlatitude cyclone, anticyclone and upper trough were growing. Between the surface cyclone and anticyclone, a cold front emerged and intensified during southward propagation. Moreover, the extratropical weather systems made up a deformation field with the cyclone in the southwest and the subtropical high which caused frontogenesis north to Chongqing. Consequently, not only the cold front intensified, but a positive feedback interaction resulted as well between low level frontogenesis and midlevel jet via secondary circulation, which enhanced the lower level convergence and associated lifting over Chongqing, destabilizing the atmosphere and providing a possible initiation mechanism. Meanwhile, lower levels over Chongqing was constantly dominated by southerly wind in the eastern part of the southwest cyclone, which transported abundant moisture from South China Sea and provided a very warm environment in company with solar radiation, resulting in conditional instability. Up to the evening of 5 May the cold front had arrived Chongqing and the strong convergence nearby caused initial development of convection. It appears that the formation of the convergence directly responsible for the storms initiation should be related to the downslope topography when the cold front entered into Sichuan Basin. In addition, the subtropical upper level jet induced strong vertical wind shear and upper level divergence were also favorable for the development of deep convection.关键词
强对流大气/冷锋/鞍形场/次级环流/地形Key words
Severe conbective weather/Cold front/Deformation field/Secondary circulation/Topography分类
天文与地球科学引用本文复制引用
孙一昕,方娟..2010年5月6日重庆强对流过程的天气学分析[J].气象科学,2012,32(6):609-621,13.基金项目
国家自然科学基金(40921160382) （40921160382）
"973"项目(2012CB417201) （2012CB417201）
中国气象局公益性行业专项项目(GYHY200706033) （GYHY200706033）
中国气象局预报员专项项目(CMAYBY2012-004) （CMAYBY2012-004）
