Influences of northward propagating 25-90-day and quasi-biweekly oscillations on eastern China summer rainfall

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	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
刊名	CLIMATE DYNAMICS
	2015
卷号	45 期号:1-2 页码:105-124
关键词	Northward propagation 25-90-day and quasi-biweekly oscillations Eastern China summer rainfall Interdecadal changes
通讯作者	eeswzp@mail.sysu.edu.cn
中文摘要	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.
学科主题	Meteorology & Atmospheric Sciences
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/14967]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
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.(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.