ISSN 1006-9895

CN 11-1768/O4

A Study of Vertical Observation of Summer Rainfall in Beijing Based on Wind Profiler Radar
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    Abstract:

    Wind profiler radar data was used to retrieve cloud dynamic characteristics such as vertical velocity, droplet terminal velocity, and microphysical parameters such as cloud water mixing ratio, rain water mixing ratio. A summer precipitation was observed and analyzed by retrieval results on 7-8 May 2020 in Beijing Haidian, combined with weather radar, sounding, automated meteorological readings, disdrometer and microwave radiometer. Results indicated that the vertically-scanning instruments as well as retrieval results obtained precipitation dynamic and microphysical information that can be applied to further studies. The station was located at the edge of the main precipitation reflectivity factor, was stratiform cloud precipitation type, and the overall precipitation reflectivity factor was weak (mainly at 0-20dBZ), vertical shear of horizontal wind at 4km ran through the entire precipitation. The precipitation was divided into two stages: the earlier stage (7th 20:00-8th 02:00) existed shallow convective structures at lower height; the convective precipitation cloud top was relatively high (average height 8207m), horizontal wind shear at low-level promoted the development of convection, the proportion of 10-20dBZ was large, particle spectrum was narrow, diameter <1mm, the rain rate was weak, but number concentration was large, the maximum value was 26305 m-3, there existed warm advection at 2-3km, and the value of water vapor and liquid water was large , rain water mixing ratio range was 0.02-0.15g/kg, cloud water mixing ratio range was 0.5-2g/kg, and large value had a wide distribution, droplet terminal velocity was 3.2-4.2m/s, vertical velocity was in range of 0.6m/s, updraft and downdraft alternated obviously; the later stage (8th 02:00-10:00) turn into typical stratiform cloud precipitation, cloud top was relatively low (average height 7831m), the proportion of <10dBZ was large, the strong value center of bright band was formed at 3100m, the particle spectrum broadened, and the maximum diameter was close to 1.5mm, but number concentration decreased, the maximum value <3000 m-3, the rain water and cloud water value was one order of magnitude smaller than convective stage, and the intensity range was narrowed, droplet terminal velocity reduced to 2.8-3.6m/s, the vertical velocity was also an order of magnitude smaller than that in convective stage, and appeared obvious horizontal orientation upward and downward areas below the height of the bright band (2.5-2.8km).

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History
  • Received:December 11,2020
  • Revised:June 17,2021
  • Adopted:September 26,2021
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