| 对流降水云中大气垂直运动反演及个例试验 |
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| 引用本文： | 董佳阳,崔晔,阮征,李南,魏鸣,李丰.对流降水云中大气垂直运动反演及个例试验[J].应用气象学报,2022,33(2):167-179. |
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| 作者姓名： | 董佳阳 崔晔 阮征 李南 魏鸣 李丰 |
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| 作者单位： | 1.南京信息工程大学，南京 210044 |
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| 摘 要： | 为深入认识对流降水云结构及动力特征,基于降水频段调频连续波5520 MHz垂直指向雷达(VPR-CFMCW),使用地面至15 km高度的反射率因子及径向速度,建立对流降水云中大气垂直运动的反演方法,分析对流垂直结构及大气垂直运动随高度分布的演变特征.对在广东龙门测站探测的2019年4月20-22日前汛期4次对流降水进行...
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| 关 键 词： | 垂直指向雷达 大气垂直运动反演 对流云垂直结构 对流云内垂直运动 华南前汛期 |
| 收稿时间： | 2021-10-27 |
Retrieval and Experiments of Atmospheric Vertical Motions in Convective Precipitation Clouds |
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| Institution: | 1.Nanjing University of Information Science & Technology, Nanjing 2100442.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 1000813.Tianjin Meteorological Observation Center, Tianjin 300061 |
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| Abstract: | Detecting the vertical motions of the atmosphere in convective clouds is difficult. The cost of aircraft detection is expensive, limited by maximum flight altitude, high detection risk, low frequency, etc. In recent years, remote sensing instruments are applied with the development of detection technology. Ground-based vertical pointing radar has become a reliable way to obtain atmospheric vertical motions, through which the cloud structure and dynamic characteristics of convective precipitation clouds can be obtained, and the distribution and evolution characteristics of the intensity and proportion of atmospheric vertical movement during the mature stage of convection can be monitored in detail. Based on the vertical structure detection data of precipitation clouds from ground to 15 km height by a vertical pointing radar with 5520 MHz C-band Frequency Modulation Continuous Wave (VPR-CFMCW) technology, the vertical motions in the convective precipitation cloud are retrieved, and the vertical structure of convection and evolution characteristics of vertical motions at different heights are analyzed. The VPR-CFMCW is used to carry out the atmospheric vertical motion retrieval experiments on 4 convective precipitation events at the Longmen Station in Guangdong Province during pre-monsoon from 20 April to 22 April in 2019. It is found that the updrafts of the atmosphere before convective precipitation have a positive contribution to the intensity of reflectivity and surface precipitation afterwards. The deep convection is inclined, which causes the vertical section to show a layered structure at certain moments. Convective precipitation is dominated by downdrafts of the entire level, updrafts and downdrafts of the upper-level atmosphere appear alternately, when downdrafts account for the highest proportion in the lower-level, and the updrafts account for an increased proportion above 6 km height. The intensity of atmospheric vertical motions is strong in the upper-level, as strong updrafts and downdrafts exceeding 10 m·s-1 mostly appear above 6 km height. The vertical motions vary greatly at 4-6 km height. The average downdraft speed is less than 5 m·s-1 and the average updraft speed is around 2 m·s-1 under 4 km height. The development of ground-based vertical pointing radar can improve the understanding of vertical structure evolution and dynamic characteristics of convective precipitation clouds. |
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