ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Microphysical Characteristic of a Severe Convection Case in East Sichuan Basin
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Abstract:
A localized severe convective rainfall event over eastern Sichuan basin under the background of southwest vortex on 8 August 2021 was analyzed by using the Chongqing S-band dual-pol radar, ERA5 reanalysis data and CMPAS multi-source precipitation product. The results are as follow: At the early development of convection, radar observed some relative weak convective characteristics. Snow particles play a major role in ice-phase particles at middle-upper level. The proportion of drizzle identification ranges from 20% to 40%, raindrops’ size and surface rain rate are both small. During the rapid intensification, radar measurements increased rapidly as well. ZDR and KDP columns can extend well above 8 km. Uplifted droplet generates supercooled water which facilitate ice-phase process over the melting layer. Melting of descending ice hydrometeors lead to the enhancement of liquid particles’ size and concentration at low level, which intensified the surface rain rate. Convective cells were merged with each other and shift eastward subsequently. As the system weakened, dry and wet snow particles become the main component of ice-phase at middle-upper level again. Both size and number of liquid particles at middle-lower level are decreased and surface rainrate gets weakened accordingly. Dual-pol variables and hydrometeor identification can basically exhibit the characteristic of hydrometeor transformation within the convective systems and cohere reasonably with the variation of surface rain rate.
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