气候变化领域集成服务门户(CCPortal): Corridors of mei-yu-season rainfall over Eastern China

CCPortal

DOI	10.1175/JCLI-D-19-0649.1
	Corridors of mei-yu-season rainfall over Eastern China
	Guan P.; Chen G.; Zeng W.; Liu Q.
发表日期	2020
ISSN	0894-8755
起始页码	2603
结束页码	2626
卷号	33 期号:7
英文摘要	Successive mesoscale convective systems may develop for several days during the mei-yu season (June-July) over eastern China. They can yield excessive rainfall in a narrow latitudinal band (called a corridor), causing severe floods. The climatology of rainfall corridors and related environmental factors are examined using 20 yr of satellite rainfall and atmospheric data. A total of 93 corridors are observed over eastern China, with maximum occurrence at 278-318N. They typically last 2-3 days, but some persist≥4 days, with an extreme event lasting 11 days. These multiday convective episodes exhibit primary and secondary peaks inthe morning and afternoon, respectively, with a diurnal cycle that is in contrast to other afternoon-peak rain events. On average, the corridors occur in; 23% days of the mei-yu season, but they can contribute; 51% of the total rainfall. They also vary with years and explain; 70% of the interannual variance of mei-yu-season rainfall. Composite analyses show that most corridors develop along zonally oriented quasi-stationary mei-yu fronts over central China where monsoon southwesterlies converge with northerly anomalies from the midlatitudes. The monsoon flow accelerates at; 0200 LST and forms a regional wind maximum or low-level jet over South China, which induces moisture flux convergence in morning-peak corridors. The nocturnal acceleration is less evident for afternoon-peak corridors. The mei-yu front and monsoon southwesterlies also influence the corridor's duration, which is regulated by a dipole of geopotential anomalies, with positive in the tropics and negative in the midlatitudes. The dipole expressesa joint influence of the blocking patterns inmidlatitudes and the El Niño-related anomalous high over the western Pacific Ocean, and the dipole's intensity explains well the interannual variations of the corridors. © 2020 American Meteorological Society.
英文关键词	Atmospheric thermodynamics; Storms; Atmospheric data; Composite analysis; Environmental factors; Interannual variation; Mesoscale Convective System; Moisture flux convergences; Quasi-stationary; Satellite rainfalls; Rain; annual variation; diurnal variation; El Nino; geopotential; monsoon; rainfall; satellite data; China; Pacific Ocean; Pacific Ocean (West); Citrus maxima
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171380
作者单位	School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University, Guangzhou, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
推荐引用方式 GB/T 7714	Guan P.,Chen G.,Zeng W.,et al. Corridors of mei-yu-season rainfall over Eastern China[J],2020,33(7).
APA	Guan P.,Chen G.,Zeng W.,&Liu Q..(2020).Corridors of mei-yu-season rainfall over Eastern China.Journal of Climate,33(7).
MLA	Guan P.,et al."Corridors of mei-yu-season rainfall over Eastern China".Journal of Climate 33.7(2020).