ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Statistical analysis of environmental parameters and classification of synoptic circulation of warm-sector heavy rainfall in Huizhou during the first rainy seasonFU Zhilong1? JIANG Shuai2,3? LI Guoping4? CHEN Fangli2? LUO Rong1? ZHANG Qiuming1
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Abstract:
Based on the precipitation data from automatic weather stations and ERA5 reanalysis data, case seletion and classification of synoptic circulation are carried on for warm-sector heavy rainfall of the first rainy season in Huizhou from April to June 2003 to 2021. And a comparison is used to study the characteristics of mean synoptic circulation and environmental parameters between different types of warm-sector rainfall events. The results showed that there are a total of 47 warm-sector heavy rainfall events in Huizhou during the first rainy season. Accroding to synoptic circulation, the selected warm-sector rainfall events are divided into three types, i.e., shear line (the first type), shortwave trough low level jet (the second type), and the edge of subtropical high the entrance of low level jet(the third type). A further comparison of mean synoptic circulation between different types of warm-sector rainfall events show that Huizhou is under the control of the west wind flow and the southwest flow around the subtropical high at 500hPa, except for the second type of heavy rainfall. In low-level, there are double low-level jet(southwest low-level jet and boundary layer low-level jet) near Huizhou both in the second and third type of heavy rainfall, while in the first type of heavy rain, boundary layer low-level jet just occurred in the south of the Pearl River Estuary at 925hPa. Finally, the analysis of environmental parameters indicate that in terms of average, the first type of heavy rainfall is superior to other types of heavy rainfall in vertical wind shear; the second type of heavy rainfall is superior to other types of heavy rainfall in the depression of dew point at 850hPa、atmospheric precipitable water、convective available potential energy and K index; the third type of heavy rainfall is superior to other types of heavy rainfall in the maximum southerly wind speed below 850hPa.
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