Characteristics Analysis of Convective Precipitation and Large-scale Precipitation in South China based on ERA5 Data

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  • Climate Center of Guangdong ProvinceGuangzhou 510641GuangdongChina

Online published: 2024-10-21

Abstract

South ChinaSCis one of the regions with the most annual precipitation in China. Under the back‐ ground of global warmingthere had been significant changes in precipitation at regional and scale levelsthe area of dry- and wet-season precipitation was expandingand regional extreme precipitation events showed a significant upward trend in SCbut the changes and impacts of different types of precipitation were not the same. To better understand how different types of precipitation in SC respond to global warmingthis paper investigated the characteristics of convective precipitationCPand large-scale precipitationLSPin SC based on ERA5 reanalysis precipitation dataset from 1960 to 2022 using linear correlationtrend analysis and wavelet analysis. The results showed that:(1SC was dominated by LSP in winter while CP in other seasons.2CP and LSP in SC showed an increasing trend in winterbut most of CP showed a decreasing trend in other seasons. CP in SC had a relatively significant 2~4 years cycle from the 1980s to the beginning of the 21st century in winteras well as there was an interdecadal characteristic of shifting from more to less in the 1990s to the beginning of the 21st century in springbut the significant cyclical variations were mainly found in the period before the 1990s in autumn. In all seasons except winterthe changes in LSP were consistent with CP.3The total precipitationTPfrom April to October in Guangdong and Guangxi was mainly CPCP accounts for about 65% of TP),with the largest proportion in August71. 8% in Guangdong and 69. 0% in Guangxi. On the other handthe proportion of CP in the first rainy seasonup to 80% in Maywas significantly higher than in the second rainy season in Hain‐ an. Additionallythe proportion of CP remained at about 50% even in autumn and winter.4The diurnal variation intensity of CP and LSP was strongest in Hainan while the intensity of CP was the weakest in Guangxi. The peak periods of the strongest precipitation in GuangdongGuangxiand Hainan occured respectively from 13:00 to 17:00Beijing timethe sameas followed),15:00 to 17:00and 14:00 to 16:00. The LSP peaked between 09:00 and 17:00 in Guangdongand it started to strengthen from 04:00 and weakened in the afternoonwith the strongest period around 10:00 in Guangxifor Hainanthe strongest period was 12:00-17:00 before Augustbut 15:00-16:00 after late September. In conclusionthe characteristics of precipitation varied with different seasons and types. Thereforeit was necessary to continue considering the impact of different types of precipitation in future research.

Cite this article

DU Hui, WANG Juanhuai, HUANG Xingxing, HU Yamin . Characteristics Analysis of Convective Precipitation and Large-scale Precipitation in South China based on ERA5 Data[J]. Plateau Meteorology, 0 : 1 . DOI: 10. 7522/j. issn. 1000- 0534. 2024. 00031

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