首页|Character of Convective Systems Producing Short-Term Heavy Precipitation in Central China Revealed by Kilometer and Minute Interval Observations

Character of Convective Systems Producing Short-Term Heavy Precipitation in Central China Revealed by Kilometer and Minute Interval Observations

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  • 国家科技期刊平台
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  • NSTL
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Accurate forecasting of heavy precipitation in central China is still a challenge,within which a key issue is our still incomplete understanding of the convective systems(CSs)responsible for such events.In this study,through use of an iterative rain-cell tracking algorithm,the macroscale characteristics(scale,intensity,duration,etc.)of the CSs that produced 595 short-term heavy precipitation events in Hunan Province,central China,are quantitatively analyzed,based on radar reflectivity,echo top,and rainfall observations at 1-km and 6-min intervals in April-September of 2016-2018.The results show that CSs present significant seasonal and diurnal features.Spring CSs usually cover a larger echo area with stronger convective cores and thus generate more precipitation than summer CSs,though sum-mer CSs develop more vigorously and frequently.CSs initiated at 1400-1600 local time are characterized by the strongest convection and a smaller spatiotemporal scale,causing violent and transient showers with typical areal pre-cipitation of 0.5-1 mm km-2,but less total precipitation.Further analyses of the relationships among the scale,intens-ity,duration,and total precipitation of CSs reveal that the convective intensity is linearly correlated to the spatiotem-poral scale of CSs,with the duration increasing on average by 0.0372 h dBZ-1;the echo area is significantly correl-ated to the total precipitation,and the duration and rainfall amount are connected with the area expansion rate(AER)of CSs:when the AER exceeds 50％,CSs expand rapidly with increasing total precipitation,but the duration is shorter.These findings provide a helpful reference for the forecasting of short-term heavy precipitation induced by CSs in central China.

convective systemradar reflectivity factortotal precipitationiterative rain-cell tracking

Zitong CHEN、Yunying LI、Zhiwei ZHANG、Jing SUN、Chengzhi YE、Anyuan XIONG

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College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073

High Impact Weather Key Laboratory of China Meteorological Administration,Changsha 410073

Unit No.92192 of Chinese People's Liberation Army,Ningbo 315000

Hubei Key Research Laboratory for Heavy Rain Monitoring and Warning,Institute of Heavy Rain,China Meteorological Administration,Wuhan 430223

Institute of Meteorological Sciences of Hunan Province,Hunan Meteorological Bureau,Changsha 410118

National Meteorological Information Centre,China Meteorological Administration,Beijing 100081

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Hunan Provincial Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2021JC0009U224220142075077

2024

10.1007/s13351-024-3150-x

气象学报(英文版)
中国气象学会

气象学报(英文版)

CSTPCD
影响因子：0.57
ISSN：0894-0525
年,卷(期)：2024.38(3)