Barotropic interaction between planetary- and synoptic-scale waves during the life cycles of blockings

	Barotropic interaction between planetary- and synoptic-scale waves during the life cycles of blockings
	Luo, DH ; Li, JP
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2000
卷号	17 期号:4 页码:649-670
关键词	envelope Rossby soliton blocking synoptic-to-planetary scale interaction
ISSN号	0256-1530
英文摘要	In this paper, in an equivalent barotropic framework a new forced nonlinear Schroedinger equation is proposed to examine the interaction between the planetary-scale waves and the localized synoptic-scale eddies upstream. With the help of the perturbed inverse scattering transform method, nonlinear parameter equations can be derived to describe the evolution of the dipole soliton amplitude. frequency, group velocity and phase under the forcing of localized synoptic-scale eddies. The numerical solutions of these equations predict that in the interaction between the weak dipole soliton (weak incipient dipole anomaly) and the synoptic-scale eddies, only when the high-frequency eddies themselves have a moderate parameter match they can near resonantly enhance a quasi-stationary large-amplitude split flow. The instantaneous total streamfunction field (the sum of background westerly wind, envelope Rossby soliton and synoptic-scale waves) is Found to be very similar to the observed Berggren-type blocking on the weather map(Berggren et al. 1949). The role of synoptic-scale eddies is to increase the amplitude of large-scale dipole anomaly now. and to decrease its group velocity, phase velocity and zonal wavenumber so that the dipole anomaly system can be amplified and transferred from dispersive system to very weak dispersive one. This may explain why and how the synoptic-scale eddies can reinforce and maintain vortex pair block. Furthermore, it is clearly found that during the prevalence of the vortex pair block the synoptic-scale eddies are split into two branches around the Vortex pair block due to the feedback of amplified dipole block.
WOS关键词	LOW-FREQUENCY VARIABILITY ; FORCED COHERENT STRUCTURES ; ATMOSPHERIC BLOCKING ; CIRCULATION CHANGES ; EDDIES ; CYCLOGENESIS ; ANOMALIES ; DYNAMICS ; EPISODE ; FLOWS
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000089649100013
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25300]
专题	自然资源部第一海洋研究所
通讯作者	Luo, DH
作者单位	1.Ocean Univ Qingdao, Dept Atmospher & Ocean Sci, State Ocean Adm, Key Lab Marine Sci & Numer Modeling, Qingdao 266003, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Luo, DH,Li, JP. Barotropic interaction between planetary- and synoptic-scale waves during the life cycles of blockings[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2000,17(4):649-670.
APA	Luo, DH,&Li, JP.(2000).Barotropic interaction between planetary- and synoptic-scale waves during the life cycles of blockings.ADVANCES IN ATMOSPHERIC SCIENCES,17(4),649-670.
MLA	Luo, DH,et al."Barotropic interaction between planetary- and synoptic-scale waves during the life cycles of blockings".ADVANCES IN ATMOSPHERIC SCIENCES 17.4(2000):649-670.