Influences of northward propagating 25-90-day and quasi-biweekly oscillations on eastern China summer rainfall
Chen, Jiepeng; Wen, Zhiping; Wu, Renguang; Chen, Zesheng; Zhao, Ping; eeswzp@mail.sysu.edu.cn
2015
发表期刊CLIMATE DYNAMICS
卷号45期号:1-2页码:105-124
文章类型0930-7575
摘要The present study reveals that rainfall anomalies associated with the 25-90-day (quasi-biweekly) tropical convective activity propagates northward (northwestward) into northern China (the Yangtze River). Enhanced rainfall over southern China results directly from enhanced convection propagating northward from the South China Sea (SCS)-western north Pacific (WNP), strengthened northward water vapor transport and intensified upper-level divergence. The anomalous anticyclone over SCS-WNP, which is induced by local lower sea surface temperature, provides a favorable condition for transporting more moisture to southern China. Stronger subtropical westerly jet and South Asia high strengthen upper-level divergence. The northward propagating 25-90-day oscillation over eastern China reaches farther north than the quasi-biweekly oscillation (QBWO). The intensity of QBWO in summer rainfall has significantly strengthened over southern China after 1993 but not for the 25-90-day oscillation. This is mainly contributed by an interdecadal increase in rainfall over southern China and the Yangtze River Basin in the wet phases of QBWO. The interdecadal enhancement of rainfall associated with the QBWO is attributed to three factors. One is lower tropospheric convergence caused by anomalous anticyclone over the WNP and anomalous cyclone over Korean Peninsula and Japan. The second is upper tropospheric divergence resulting from strengthening of subtropical westerly jet and the South Asia high. The last is enhanced ascent over South China through meridional vertical circulation.
部门归属[Chen, Jiepeng; Wen, Zhiping; Chen, Zesheng] Sun Yat Sen Univ, Ctr Monsoon & Environm Res, Dept Atmospher Sci, Guangzhou 510275, Guangdong, Peoples R China; [Chen, Jiepeng] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Wen, Zhiping; Zhao, Ping] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China; [Wen, Zhiping] Jiangsu Collaborat Innovat Ctr Climate Change, Nanjing, Jiangsu, Peoples R China; [Wu, Renguang] Chinese Univ Hong Kong, Inst Space & Earth Informat Sci, Shatin, Hong Kong, Peoples R China; [Wu, Renguang] Chinese Univ Hong Kong, Shenzhen Res Inst, Shatin, Hong Kong, Peoples R China ; LTO
关键词Northward Propagation 25-90-day And Quasi-biweekly Oscillations Eastern China Summer Rainfall Interdecadal Changes
学科领域Meteorology & Atmospheric Sciences
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15080
专题热带海洋环境国家重点实验室(LTO)
通讯作者eeswzp@mail.sysu.edu.cn
推荐引用方式
GB/T 7714
Chen, Jiepeng,Wen, Zhiping,Wu, Renguang,et al. Influences of northward propagating 25-90-day and quasi-biweekly oscillations on eastern China summer rainfall[J]. CLIMATE DYNAMICS,2015,45(1-2):105-124.
APA Chen, Jiepeng,Wen, Zhiping,Wu, Renguang,Chen, Zesheng,Zhao, Ping,&eeswzp@mail.sysu.edu.cn.(2015).Influences of northward propagating 25-90-day and quasi-biweekly oscillations on eastern China summer rainfall.CLIMATE DYNAMICS,45(1-2),105-124.
MLA Chen, Jiepeng,et al."Influences of northward propagating 25-90-day and quasi-biweekly oscillations on eastern China summer rainfall".CLIMATE DYNAMICS 45.1-2(2015):105-124.
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