%0 Journal Article %A ZHANG Kaimei %A LI Liping %A CHEN Shengdong %T Analysis of Interdecadal Variation of Precipitation and Impact Factors During the Pre-rainy Season in South China %D 2016 %R 10.11755/j.issn.1006-7639(2016)-01-0064 %J Journal of Arid Meteorology %P 64-74 %V 34 %N 1 %X

Based on the daily precipitation data provided by the National Meteorological Information Center from 89 representative stations in South China, as well as the reanalyzed monthly average 850 hPa wind field from the National Centers for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) and extended reconstructed sea surface temperature (SST) data from 1969 to 2013, the interdecadal variation and the causes of extreme precipitation during the pre-rainy season in South China were analyzed, moreover, the interdecadal abnormal coupling relation among SST, 850 hPa wind field and extreme precipitation during the pre-rainy season in South China were also analyzed. The results are as follows:(1)The “El-Nio-Southern-Oscillation-like”(ENSO-like) positive SST anomaly during 1977-1997 and the corresponding atmospheric circulation anomaly were major causes of less extreme precipitation during the pre-rainy season in most part of South China. However, from about 1997 to 2010, the preceding winter SST presented ENSO-like negative SST, there were more extreme precipitation in most part of South China during the pre-rainy seanson. (2) On interdecadal scales, when it was the ENSO-like positive SST anomaly during the pre-rainy season in South China, there was an anomaly strong anti-cyclonic circulation over the middle-high latitude North Pacific, its western end southern flow was conducive to the South China Sea warm flow transport to South China, meanwhile, the east flow stream coming from mid-latitude Western Pacific was in favour of the wet air transport to South China, the intersection of two section airflow to South China caused severe pre-rainy season floods in South China. However, the ENSO-like negative SST anomaly was conducive to pre-rainy season less rain  in South China.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2016)-01-0064