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	A study of richardson number and instability in moist saturated flow
	Yang Shuai; Gao Shou-Ting; Wang Dong-Hai
刊名	Chinese journal of geophysics-chinese edition
	2007-03-01
卷号	50期号:2页码:377-386
关键词	Richardson number Precipitation Instability Modification Ri equation
ISSN号	0001-5733
通讯作者	Yang shuai(ys_ys@126.com)
英文摘要	We have derived the ri equations in dry and moist saturated flow in the atmosphere. a rainfall case which occurred in northern china is numerically simulated, and the model output data is used to calculate and analyze comparatively the terms of ri equations in dry air and moist saturated flow. the analysis shows that the vertical shear of horizontal velocity dominates the influence on ri change and instability in dry process, whereas in the moist case, the influence of numerator of ri (i.e., brunt-vaisala frequency, named bvf) on ri change and instability can reach up to the same magnitude order as the denominator of ri. since bvf has very important influence on instability in the moist case, we have looked for the expression of bvf which is more appropriate for the real moist case. thus ri is modified, so that we can estimate instability in the moist process. it is found that, due to considering the virtual temperature effect and the change of total water mixing ratio (i.e., part liquid water is dropped out the parcel), the stability in the rainy region is effectively decreased. therefore, the modified moist ri formula may be more appropriate to diagnose the instability in rainy regions.
WOS关键词	LAYER ; STABILITY ; MODEL ; SHEAR
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000245399900007
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2383349
专题	中国科学院大学
通讯作者	Yang Shuai
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, Beijing 100029, Peoples R China 2.Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Yang Shuai,Gao Shou-Ting,Wang Dong-Hai. A study of richardson number and instability in moist saturated flow[J]. Chinese journal of geophysics-chinese edition,2007,50(2):377-386.
APA	Yang Shuai,Gao Shou-Ting,&Wang Dong-Hai.(2007).A study of richardson number and instability in moist saturated flow.Chinese journal of geophysics-chinese edition,50(2),377-386.
MLA	Yang Shuai,et al."A study of richardson number and instability in moist saturated flow".Chinese journal of geophysics-chinese edition 50.2(2007):377-386.

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