南京及周边地区雷达气候学分析

An analysis of radar climatology in Nanjing and its vicinity

为了研究南京及周边地区暖季(6—9月)对流风暴的活动分布规律,利用2009—2013年6—9月长时间序列的南京多普勒天气雷达数据识别对流回波并格点化,统计并分析了南京及周边地区对流风暴的气候学分布特征,结果表明:(1)在暖季,南京及周边地区对流风暴具有明显的区域分布特征,其中7与8月为对流风暴活动高峰期,对流风暴频数分布大值中心位于南京东部沿江地区;(2)不同尺度和伸展高度对流风暴的分布特征各不相同,较大较深对流的分布大值中心更加明显;(3)对流风暴的垂直结构因月份不同而有所差异,7与8月对流风暴强度最大;(4)不同尺度和伸展高度对流风暴频数存在明显的日变化特征,呈多峰分布,主峰值区位于午后,同样,各月份对流风暴频数的日变化特征也非常明显,呈单峰或者多峰分布。

Long-time series of Doppler radar measurements from June to September of 2009-2013 have been used to investigate the climatological distribution of convection in the warm season at Nanjing.Result indicate that：（1）In the warm season,there is an obvious areal distribution characteristic of convection at Nanjing.July and August are the periods with most active convective activities.High frequencies of large convective storms are found in the eastern part of Nanjing.（2）Distribution features of convective storms vary with different scales and upward extensions of the storms.The high frequency center is more distinct for large and deep convective storms.（3）The vertical structure of the convective storm varies with month,and convective storms in July and August are the strongest.（4）The frequencies of convective storms at different scales and upward extensions have a clear diurnal variation with multi-peaks.The primary peak occurs in the early afternoon.Similarly,the diurnal variation of the storm frequency is distinct in all the months with single-or multi- peak features.