CLIMATOLOGICAL CHARACTERISTICS OF SPRING PRECIPITATION OVER SOUTHERN CHINA AND ITS INTRASEASONAL OSCILLATION

Based on observations and reanalysis data,the characteristics of the evolution of climatological spring precipitation over Southern China（SPSC） and the associated climatological intraseasonal oscillation（CISO） and atmospheric circulation are studied.Results show that SPSC increases in an oscillatory...

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Published inJournal of Tropical Meteorology Vol. 22; no. 2; pp. 233 - 242
Main Author 潘蔚娟 李春晖 蒋承霖
Format Journal Article
LanguageEnglish
Published Guangzhou Guangzhou Institute of Tropical & Marine Meteorology 01.06.2016
Subjects
Atmospheric circulation
Precipitation
Rain
Seasons
Studies
Summer
Wind
Winter
China, People's Rep
Online AccessGet full text
ISSN1006-8775
DOI10.16555/j.1006-8775.2016.02.013

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Summary:Based on observations and reanalysis data,the characteristics of the evolution of climatological spring precipitation over Southern China（SPSC） and the associated climatological intraseasonal oscillation（CISO） and atmospheric circulation are studied.Results show that SPSC increases in an oscillatory way.Although the evolution of SPSC is similar in different regions,there are also differences.In different regions of Southern China,the onset dates of the rain season are from the 12 th to 24 th pentad and the peak dates are after the 20 th pentad.CISO is an important component of SPSC,which is not only statistically significant,but also accompanies a dynamically coherent structure.The peak wet/dry phase of each CISO cycle corresponds to a significant rainfall increasing/decreasing period and modulates the evolution of SPSC.The rainfall growth in the second half of March and mid-April is the result of the modulation.The wet/dry phase of CISO is accompanied by low-level convergent（upper-level divergent） and cyclonic（anti-cyclonic） circulation,which favors ascending motion to develop over Southern China.
Bibliography:spring precipitation over Southern China wavelet analysis climatological intraseasonal oscillation
PAN Wei-juan , LI Chun-hui , JIANG Cheng-lin （1. Guangzhou Climate and Agrometeorology Center, Guangzhou Meteorological Administration, Guangzhou 511430 China; 2. Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, CMA, Guangzhou 510080 China; 3. Guangdong Provincial Climate Center, Guangzhou 510080 China）
44-1409/P
Based on observations and reanalysis data,the characteristics of the evolution of climatological spring precipitation over Southern China（SPSC） and the associated climatological intraseasonal oscillation（CISO） and atmospheric circulation are studied.Results show that SPSC increases in an oscillatory way.Although the evolution of SPSC is similar in different regions,there are also differences.In different regions of Southern China,the onset dates of the rain season are from the 12 th to 24 th pentad and the peak dates are after the 20 th pentad.CISO is an important component of SPSC,which is not only statistically significant,but also accompanies a dynamically coherent structure.The peak wet/dry phase of each CISO cycle corresponds to a significant rainfall increasing/decreasing period and modulates the evolution of SPSC.The rainfall growth in the second half of March and mid-April is the result of the modulation.The wet/dry phase of CISO is accompanied by low-level convergent（upper-level divergent） and cyclonic（anti-cyclonic） circulation,which favors ascending motion to develop over Southern China.
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ISSN:1006-8775
DOI:10.16555/j.1006-8775.2016.02.013