气候变化领域集成服务门户(CCPortal): Dynamics of East Asian spring rainband and spring-autumn contrast: Environmental forcings of large-scale circulation

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DOI	10.1175/JCLI-D-20-0501.1
	Dynamics of East Asian spring rainband and spring-autumn contrast: Environmental forcings of large-scale circulation
	Wang S.-X.; Zuo H.-C.; Sun F.; Wu L.-Y.; Yin Y.; Luo J.-J.
发表日期	2021
ISSN	08948755
起始页码	3523
结束页码	3541
卷号	34 期号:9
英文摘要	Dynamics of the East Asian spring rainband are investigated with a reanalysis dataset and station observations. Here, it is revealed that the rainband is anchored by external forcings. The midtropospheric jet core stays quasi-stationary around Japan. It has two branches in its entry region, which originate from the south and north flanks of the Tibetan Plateau and then run northeastward and southeastward, respectively. The southern branch advects warm air from the Tibetan-Hengduan Plateau northeastward, forming a rainband over southern China through causing adiabatic ascent motion and triggering diabatic feedback. The rainband is much stronger in spring than in autumn due to the stronger diabatic heating over the Tibetan-Hengduan Plateau, a more southward-displaced midtropospheric jet, and the resulting stronger warm advection over southern China. The northern jet branch forms a zonally elongated cold advection belt, which reaches a maximum around northern China, and then weakens and extends eastward to east of Japan. The westerly jet also steers strong disturbance activities roughly collocated with the cold advection belt via baroclinic instability. The high disturbance activities belt causes large cumulative warm advection (CWA) through drastically increasing extremely warm advection days on its eastern and south flanks, where weak cold advection prevails. CWA is more essential for monthly/seasonally rainfall than conventionally used time-average temperature advection because it is shown that strengthened warm advection can increase rainfall through positive diabatic feedback, while cold advection cannot cause negative rainfall. Thus, the rainband is collocated with the large CWA belt instead of the warm advection south of it. This rainband is jointed to the rainband over southern China, forming the long southwest-northeast-oriented East Asian spring rainband. Increasing moisture slightly displaces the rainband southeastward. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Dynamics; Feedback; Jets; Large-scale motions; Precipitation; Synoptic climatology
语种	英语
scopus关键词	Belts; Rain; Baroclinic instability; Diabatic heating; Large-scale circulation; Northern China; Quasi-stationary; Southern China; Tibetan Plateau; Warm advection; Advection
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/178613
作者单位	School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, China; College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Business School, Nanjing University of Information Science and Technology, Nanjing, China; College of Environment and Planning, Henan University, Kaifeng, China; Institute for Climate and Application Research, Nanjing University of Information Science and Technology, Nanjing, China
推荐引用方式 GB/T 7714	Wang S.-X.,Zuo H.-C.,Sun F.,et al. Dynamics of East Asian spring rainband and spring-autumn contrast: Environmental forcings of large-scale circulation[J],2021,34(9).
APA	Wang S.-X.,Zuo H.-C.,Sun F.,Wu L.-Y.,Yin Y.,&Luo J.-J..(2021).Dynamics of East Asian spring rainband and spring-autumn contrast: Environmental forcings of large-scale circulation.Journal of Climate,34(9).
MLA	Wang S.-X.,et al."Dynamics of East Asian spring rainband and spring-autumn contrast: Environmental forcings of large-scale circulation".Journal of Climate 34.9(2021).