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| Climatic characteristics and influence system analysis of rainstorm in flood season in Nancheng County |
| Tu Feng1, Rao Liuxintian2 |
1. Nancheng County Meteorological Bureau,Nancheng 344700;
2. Fuzhou Meteorological Observatory,Fuzhou 344000 |
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Abstract Based on the daily precipitation data of Nancheng County's national baseline climate station from 1960 to 2023,11 township regional meteorological stations from 2014 to 2023,routine observation on the ground and upper air,and reanalysis data of the National Meteorological Science Data Center,the climatic characteristics and impact system of rainstorm in flood season in Nancheng County during 64 years were statistically analyzed by using mathematical statistics,synoptic analysis and other methods.The results show that the spatial distribution of rainstorm days in flood season in Nancheng County is characterized by "more on both sides and less in the middle";There are 4.3 rainstorm days per year,and the number of rainstorm days increases at an average speed of 0.5 d ·(10 a) -1.The number of rainstorm days is the most in June,with great interannual variation;The number of rainstorm days changed from less to more in 1976;The number of annual rainstorm days has a short period change of 2-3 days,4-6 days,an interdecadal period change of 13 to 15 years,and a low-frequency oscillation of about 33 years.The main impact systems of rainstorm include 500 hPa high-altitude trough,low level southwest vortex and shear line,surface cold front,stationary front and Jianghuai cyclone.
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Received: 24 December 2025
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2026, Vol. 43 
