ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 45 Issue 10 > 2019,45(10):1415-1425. DOI:10.7519/j.issn.1000-0526.2019.10.008 Prev Next
Study of Macro and Micro Properties of Cloud and Precipitation Caused by Tibetan Plateau Vortex Based on Radar Observations
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Abstract:
In order to enhance the understanding of the macro and micro physical structures and characteristics of cloud-precipitation under the plateau vortex, conventional weather data, combined with the data of millimeter-wave cloud radar and rain droplet disdrometer from TDPEX-Ⅲ were used in this paper for comprehensive analysis of a plateau vortex weather which affected the Nagqu Region, including weather background, horizontal and vertical structures of cloud-precipitation and evolution characteristics. The conclusions are as follows. The vortex cloud system formed under the plateau vortex and this process evolved from convective clouds to cumulostratus mixed clouds. In the stage of convective clouds, echoes mostly distributed sparsely with small area and short duration, accompanied by strong ascending motion. The positive velocity zone in the cloud was mostly strips or thin strips, and the convective clouds had higher cloud top, which was “mushroom-shaped”. The rain intensity was weak and the concentration of droplet particles was low. In the stage of mixed clouds, the echoes were mostly in the form of regular patches with larger area and durations were longer. The positive velocity zone in the cloud were often columnar or block-shaped. Near the surface, bright bands were obvious, caused by the phase change of the particles. Due to the collision of the precipitation particles, the reflectivity factor below the bright band was significantly reduced. Droplets were mostly in the size of 1-3 mm with larger concentrations. Thus, there are obvious differences of radar echoes and precipitation features between different stages under the process of plateau vortex, and the finding might provide some references for the research of plateau weather forecasting and physical processes.
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