中文摘要：

为了解南京地区低空急流的活动特点,对两部风廓线雷达在2005—2008年收集的风廓线数据,分别从低空急流的月变化、日变化、急流中心特征以及伴随的天气情况等几方面开展了统计分析和对比研究。结果表明,低空急流存在明显的月变化及日变化规律,春、夏季出现低空急流次数多于秋、冬季;凌晨和夜间是低空急流活动的活跃期,且午夜出现极大风速的概率最大;低空急流中心主要出现在1 400 m高度以下,且低空急流中心速度的增强有利于降水的发生。夏季低空急流的出现有利于暴雨的发生。边界层风廓线雷达和对流层风廓线雷达的统计结果具有较好的一致性,两部雷达都能够较好地连续监测低空急流的发生发展。

英文摘要：

In order to understand the activity characteristics of the low-level jet in Nanjing, a statistical analysis and comparative study on monthly changes, diurnal variation, central feature and accompanying weather conditions of low-level jets has been conducted by using the wind profile data in 2005-2008 collected by two wind profilers. The results show that low-level jets have significant monthly and diurnal variations. Low-level jets occur more frequent in spring and summer than in autumn and winter and they are more active in early morning and at night, with the maximum wind speed usually occurring at midnight. The central part of the low-level jet occurs mainly at the height of less than 1400m, and the enhancement of central speed is beneficial to the appearance of precipitation. Meanwhile, when the low-level jet appears in summer, it helps cause heavy rain. The statistical results of the boundary wind profiler has good consistence with tropospheric wind profilers. Two kinds of wind profilers also have the capability of continuously detecting the development of low-level jets.