| 一次基于风廓线雷达观测的北京夏季降水的垂直观测研究 |
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| 引用本文： | 黄钰,郭学良,罗秀明,陈羿辰,张邢,杜远谋,刘海龙.一次基于风廓线雷达观测的北京夏季降水的垂直观测研究[J].大气科学,2022,46(2):393-405. |
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| 作者姓名： | 黄钰 郭学良 罗秀明 陈羿辰 张邢 杜远谋 刘海龙 |
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| 作者单位： | 1.北京市人工影响天气办公室，北京 100089 |
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| 基金项目： | 国家重点研发计划;国家自然科学基金 |
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| 摘 要： | 本文利用风廓线雷达数据反演了降水云体的大气垂直速度、雨滴下落末速度等云动力特征和云水混合比、雨水混合比等云微物理参数,并结合天气雷达、探空、自动站、雨滴谱仪和微波辐射计等数据对2020年5月7～8日发生在北京市海淀区的一次夏季降水过程进行垂直综合观测.结果表明:垂直探测仪器观测及其反演的数据可以获得降水云体的详细动力参...
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| 关 键 词： | 风廓线雷达 云微物理场 云垂直动力场 夏季降水 垂直综合观测 |
| 收稿时间： | 2020-12-11 |
Vertical Observation Study of Summer Rainfall in Beijing Based on Wind Profiler Radar |
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| HUANG Yu,GUO Xueliang,LUO Xiuming,CHENG Yichen,ZHANG Xing,DU Yuanmou,LIU Hailong.Vertical Observation Study of Summer Rainfall in Beijing Based on Wind Profiler Radar[J].Chinese Journal of Atmospheric Sciences,2022,46(2):393-405. |
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| Authors: | HUANG Yu GUO Xueliang LUO Xiuming CHENG Yichen ZHANG Xing DU Yuanmou LIU Hailong |
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| Institution: | 1.Beijing Weather Modification Office, Beijing 1000892.Beijing Key Laboratory of Cloud, Precipitation and Water Resources, Beijing (Municipal) Meteorological Service, Beijing 1000893.Field Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing 1000894.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1000295.Guangde Meteorology Bureau, Guangde, Anhui 2422006.Flight Control Office of the 95820 Army, Beijing 102211 |
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| Abstract: | Wind profiler radar data was used to retrieve cloud dynamic characteristics, including vertical velocity, droplet terminal velocity, and microphysical parameters such as cloud and rain water mixing ratios. Summer precipitation in Haidian District of Beijing on 7–8 May 2020, was observed and analyzed by retrieval results using weather radar, sounding, automated meteorological readings, disdrometer, and microwave radiometer. Results indicated that the vertically scanning instruments and retrieval results obtained precipitation dynamic and microphysical information that can be used for further studies. The station was near the edge of the main precipitation reflectivity factor and had stratiform cloud precipitation. The overall precipitation reflectivity factor was weak (mainly at 0–20 dBZ), with the vertical shear of horizontal wind at 4 km running through total precipitation. The precipitation was divided into two stages. The earlier stage 2000 BJT (Beijing time) 7 to 0200 BJT 8 May 2020] had shallow convective structures at a lower height, and the convective precipitation cloud top was relatively high (average height 8207 m). Horizontal wind shear at low-level aided the development of convection, and the proportion of 10–20 dBZ was large. The particle spectrum was narrow, with a diameter ＜1 mm, and the rain rate was weak. However, the number concentration was large, reaching a maximum of 26305 m?3. Warm advection was present at 2–3 km, water vapor and liquid water values were high, and the rain water mixing ratio range was 0.02–0.15 g/kg. The cloud water mixing ratio range was 0.5–2 g/kg, with a large value and wide distribution. Droplet terminal velocity was 3.2–4.2 m/s, with vertical velocity in the range of ±0.6 m/s, and updraft and downdraft alternated. The later stage (0200–1000 BJT 8 May 2020) became typical stratiform cloud precipitation, with a relatively low cloud top (average height 7831 m). The proportion of ＜10 dBZ was large, the strong value center of the bright band was formed at 3100 m, the particle spectrum broadened, and the maximum diameter was close to 1.5 mm. However, the number concentration decreased, with a maximum value ＜3000 m?3. The rain and cloud water values were one order of magnitude lower than that of the convective stage. The intensity range was narrow, the droplet terminal velocity was reduced to 2.8–3.6 m/s, and the vertical velocity was reduced by an order of magnitude compared to the convective stage. There was obvious horizontal orientation upward and downward areas below the height of the bright band (2.5–2.8 km). |
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