摘要
2006年6月21日09:04南京禄口机场监测到较强风切变。龙王山(南京)多普勒天气雷达观测图上显示,此时恰有一直径为50 km的对流云团自西向东经过禄口机场。南京市地面自动气象站的观测也表明,此时在南京地区近地层气流出现急剧变化。利用多普勒天气雷达资料对风暴进行立体结构分析,并结合地面自动气象站资料分析得知,这次过程在3 km以下的低层有水平方向的风切变,在1 km高度处有垂直方向的风切变。从多普勒天气雷达的垂直积分液态含水量产品能够更直接地看到对流云团的发展过程,这有助于预报风切变发生的位置。这次雷暴系统中宏下击暴流引起的高空气流下沉,至地面后向两侧辐散,造成水平方向及垂直方向都有强风切变存在。
A intensity wind shear at Lukou airport in Nanjing at 09：00 on 21 June 2006 is observed.A 50 km diametric convective cell moved eastward passing Lukou airport.It could been observed in reflectivity PPI image from Doppler radar at Longwang hill in Nanjing.This convective system leaded to the wind shear process at Lukou airport.Mesoscale observation network confirmed that there was rapidly changing flow in Nanjing at that time.These two data were analyzed.The analysis showed that there was horizontal wind shear at low level below 3 km and vertical wind shear at 1 km height.Development process of the convective cell can be clearly understand with the help of Vertical Integral Liquid product evolved from Doppler radar.This is helpful to forecast the location of wind shear.Downward flow from macroburst spreading on surface induced horizontal and vertical severe wind shear.
出处
《高原气象》
CSCD
北大核心
2010年第5期1289-1296,共8页
Plateau Meteorology
基金
国家自然科学基金项目(40775005)
中国气象局新技术推广项目(CMATG2008M39)
北极阁基金(BJG200804)共同资助
