CAJ | 학술논문

用多普勒天气雷达探测资料、地面沙尘暴探测资料、卫星图像和常规气象资料对2009年4月23日发生在内蒙古中西部地区一次大风、扬沙及沙尘暴天气过程进行了连续监测和分析。结果表明：高空槽发展加强,强锋区南压,地面冷锋影响,气压梯度大是造成沙尘暴的天气形势。红外图像形成＂沙尘羽＂,结构均匀有纹理,云顶亮温出现〈-60℃区域是卫星图像特征。雷达回波显示,反射率因子〉30 dBZ,影响高度2.4 km以上;径向速度图上出现明显辐合辐散特征,强风区增大,上升运动及下沉运动加强;高空有垂直风切变,高度降低厚度增加,能量增加,当垂直风切变变小时,高空动量开始下传,沙尘天气开始。地面沙尘暴探测资料显示,空气中质量浓度的最高值出现在沙尘天气最强及极大风速出现时刻,最大值达8 223.7μg.h-1,比沙尘天气出现前81.8μg.h-1高出100倍,沙尘天气造成空气相当混浊。
용다보륵천기뢰체탐측자료、지면사진폭탐측자료、위성도상화상규기상자료대2009년4월23일발생재내몽고중서부지구일차대풍、양사급사진폭천기과정진행료련속감측화분석。결과표명：고공조발전가강,강봉구남압,지면랭봉영향,기압제도대시조성사진폭적천기형세。홍외도상형성＂사진우＂,결구균균유문리,운정량온출현〈-60℃구역시위성도상특정。뢰체회파현시,반사솔인자〉30 dBZ,영향고도2.4 km이상;경향속도도상출현명현복합복산특정,강풍구증대,상승운동급하침운동가강;고공유수직풍절변,고도강저후도증가,능량증가,당수직풍절변변소시,고공동량개시하전,사진천기개시。지면사진폭탐측자료현시,공기중질량농도적최고치출현재사진천기최강급겁대풍속출현시각,최대치체8 223.7μg.h-1,비사진천기출현전81.8μg.h-1고출100배,사진천기조성공기상당혼탁。
Based on Doppler weather radar data,surface dust observation data,satellite images and meteorological data,a strong wind,blowing sand and dust storm weather process occurred in central and western Inner Mongolia on 23 April 2009 was monitored and analyzed.The results showed that strengthening and developing of the upper trough,moving to south of the strong frontal zone,the influence of the surface cold front and the big pressure gradient resulted in this weather process.The ＂dust feather＂ occurred and well-proportioned structure with texture,and the TBB -60 ℃ region appeared in the satellite images.Radar echoes showed the reflectivity factor was more than 30 dBZ,the significant convergence and divergence character presented in radial velocity image and the strong wind zone increased,the upward and downward movement strengthened;the vertical wind shear occurred in the upper level,when it decreased the upper momentum started to transport downward and dust weather occurred.Ground dust detecting data showed that the maximum of mass concentration（8 223.7μg·h-1）in air appeared when wind speed was the largest,which was 100 times more than that of the onset of dust weather.