Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0085.1 |
The Importance of Critical Layer in Differentiating Developing from Nondeveloping Easterly Waves | |
Asaadi, Ali1; Brunet, Gilbert2; Yau, M. K.1 | |
2017-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Recently Asaadi et al. found that an easterly wave (EW) train over the Atlantic and eastern Pacific is oriented in a southeast-northwest direction because of the observed tilt in the easterly jet. This tilt results in only one out of four (similar to 25%) waves to be located at the cyclonic critical layer south of the jet axis in a co-moving frame, and they subsequently developed into named storms. Asaadi et al. suggested a geometrical view for developing disturbances, which is the coexistence of a nonlinear critical layer and a region of weak meridional potential vorticity (PV) gradient over several days. Asaadi et al. focused on the developing waves and did not investigate the nondeveloping ones. To determine whether the nondeveloping EWs are not associated with a critical layer, a simple objective tracking technique is used to identify EWs. Composite views of the large-scale structure and characteristics of nondeveloping EWs show that similar to 91% of nondeveloping waves are not located on a critical layer, while the remaining similar to 9% indicate characteristics similar to the developing waves. Examination of the composite Okubo-Weiss parameter indicates that the nondeveloping waves are characterized by larger negative values, implying that they are dominated by deformation, unlike developing waves, which tend to be more immune from the deformation. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394341100006 |
WOS关键词 | KELVIN CATS-EYE ; TROPICAL CYCLOGENESIS ; ATLANTIC ; DISTURBANCES ; DYNAMICS ; SYSTEMS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29370 |
专题 | 地球科学 |
作者单位 | 1.McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada; 2.Environm & Climate Change Canada, Meteorol Res Div, Dorval, PQ, Canada |
推荐引用方式 GB/T 7714 | Asaadi, Ali,Brunet, Gilbert,Yau, M. K.. The Importance of Critical Layer in Differentiating Developing from Nondeveloping Easterly Waves[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(2). |
APA | Asaadi, Ali,Brunet, Gilbert,&Yau, M. K..(2017).The Importance of Critical Layer in Differentiating Developing from Nondeveloping Easterly Waves.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(2). |
MLA | Asaadi, Ali,et al."The Importance of Critical Layer in Differentiating Developing from Nondeveloping Easterly Waves".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.2(2017). |
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