【作者】 陶林科； 胡文东； 杨有林； 杨侃；

【Author】 TAO Linke1, HU Wendong2, YANG Youlin2, YANG Kan2 1 Wuzhong Meteorological Bureau of Ningxia, Wuzhong 751100 2 Key Laboratory of Meteorological Disaster Preventing and Reducing of Ningxia, Yinchuan 750002

【机构】 宁夏吴忠市气象局； 宁夏防灾减灾重点实验室；

【摘要】 2004年6月7日下午,银川地区出现了一次干下击暴流形成的阵风锋天气,此次下击暴流造成银川地区短时的大风。本文利用多普勒雷达观测资料和自动站实况资料,结合宁夏本地化中尺度数值预报MM5模式,对阵风锋产生短时大风天气过程,进行了雷达气象学和中小尺度天气学分析。结果表明:这次突发短时大风天气的根本原因,是下击暴流形成阵风锋所造成。阵风锋到达气象站引起风速增加、温度下降、相对湿度上升,气压无明显变化。阵风锋在对流云团减弱后,仍继续沿着原来的移动方向推进,并维持32min左右。更多还原

【Abstract】 The Doppler Weather Radar(CINRAD-CDN) data, the intensely observed data from medium-scale automatic meteorological stations and the numerical products of meso-scale numerical model MM5 are used to analyze a gust front process in Yinchuan. It is indicated that the gust front occurs in the near-surface layer(about 1400 meter high) which cause the instantaneous gale. When the gust front arrives weather station, the wind velocity and the relative humidity increase and the temperature decrease, but the atmospheric pressure has no obvious change. After the weakening of the convective cloud cluster, the gust front could go on 32 minutes along its previous route.更多还原