Characteristics Analysis of Convective Precipitation and Large-scale Precipitation in South China based on ERA5 Data
Online published: 2024-10-21
South China(SC)is one of the regions with the most annual precipitation in China. Under the back‐ ground of global warming,there had been significant changes in precipitation at regional and scale levels,the area of dry- and wet-season precipitation was expanding,and regional extreme precipitation events showed a significant upward trend in SC,but 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 warming,this paper investigated the characteristics of convective precipitation(CP)and large-scale precipitation(LSP)in SC based on ERA5 reanalysis precipitation dataset from 1960 to 2022 using linear correlation,trend analysis and wavelet analysis. The results showed that:(1)SC was dominated by LSP in winter while CP in other seasons.(2)CP and LSP in SC showed an increasing trend in winter,but 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 winter,as well as there was an interdecadal characteristic of shifting from more to less in the 1990s to the beginning of the 21st century in spring,but the significant cyclical variations were mainly found in the period before the 1990s in autumn. In all seasons except winter,the changes in LSP were consistent with CP.(3)The total precipitation(TP)from April to October in Guangdong and Guangxi was mainly CP(CP accounts for about 65% of TP),with the largest proportion in August(71. 8% in Guangdong and 69. 0% in Guangxi). On the other hand,the proportion of CP in the first rainy season(up to 80% in May)was significantly higher than in the second rainy season in Hain‐ an. Additionally,the proportion of CP remained at about 50% even in autumn and winter.(4)The 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 Guangdong,Guangxi,and Hainan occured respectively from 13:00 to 17:00(Beijing time,the sameas followed),15:00 to 17:00,and 14:00 to 16:00. The LSP peaked between 09:00 and 17:00 in Guangdong,and it started to strengthen from 04:00 and weakened in the afternoon,with the strongest period around 10:00 in Guangxi,for Hainan,the strongest period was 12:00-17:00 before August, but 15:00-16:00 after late September. In conclusion,the characteristics of precipitation varied with different seasons and types. Therefore,it was necessary to continue considering the impact of different types of precipitation in future research.
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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