【摘要】 选取江西省宜春市晴空、弱降水、强降水三类天气过程个例,结合天气形势、雷达回波、气象要素等资料,对比分析了风廓线雷达产品特征。结果表明:(1)在晴空天气背景下,风廓线雷达探测高度低,水平风速小,垂直风速正负值交替出现,大气折射率结构常数(Cn2)值最小。(2)在稳定性弱降水天气背景下,大气呈稳定状态,风廓线雷达探测高度随降水的产生而逐渐抬升,高低层有明显的风速切变,850 hPa赣南至赣东北有西南急流穿过,赣北有切变线存在,利于降水产生,垂直风速因降水影响出现朝向雷达正速度,Cn2值比晴空时大。(3)在具有产生强对流天气背景下,大气中对流强烈,风廓线雷达的水平风速增大,西南急流深厚且不断下沉,850—700 hPa有强烈的垂直切变,动力条件和水汽条件利于强降水产生,垂直风速表现为更大的朝向雷达正速度,Cn2值比弱降水时的大。更多还原

【Abstract】 Combing with the weather situation,radar echo products and meteorological elements,three types of weather cases,sunny,light precipitation and heavy precipitation,are chosen to analyze the features of the wind profiler in Yichun,respectively.The results show:(1)Under the status of sunny day,the detecting altitude of wind profiler is low with weak horizontal wind speed. The vertical wind speed values presented the positive and negative change alternately,and the value of atmospheric refractive index structure constant(Cn2)is the smallest among the three types of weather samples.(2)Under the status of light precipitation,the atmospheric condition is stable,and wind profiler radar detecting height lifts gradually with precipitation occurrence. Also,there is an obvious vertical wind shear with the shallow southwest jet at 850 hPa. And the Cn2value is greater than that in sunny day.(3)Under the weather status of strong convection,the horizontal wind speed of wind profiler radar increases with deep southwest jet stream and there is strong vertical shear between 850-700 hPa. The dynamic and water vapor conditions are propitious to the generation of precipitation. Vertical wind speed presents a larger positive value toward the radar. The Cn2value is greater than that in light precipitation day.更多还原