Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0108.1 |
The Emergence of Shallow Easterly Jets within QBO Westerlies | |
Hitchcock, Peter1,4; Haynes, Peter H.2; Randel, William J.1; Birner, Thomas3 | |
2018 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:1页码:21-40 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; France |
英文摘要 | A configuration of an idealized general circulation model has been obtained in which a deep, stratospheric, equatorial, westerly jet is established that is spontaneously and quasi-periodically disrupted by shallow easterly jets. Similar to the disruption of the quasi-biennial oscillation (QBO) observed in early 2016, meridional fluxes of wave activity are found to play a central role. The possible relevance of two feedback mechanisms to these disruptions is considered. The first involves the secondary circulation produced in the shear zones on the upper and lower flanks of the easterly jet. This is found to play a role in maintaining the aspect ratio of the emerging easterly jet. The second involves the organization of the eddy fluxes by the mean flow: the presence of a weak easterly anomaly within a tall, tropical, westerly jet is demonstrated to produce enhanced and highly focused wave activity fluxes that reinforce and strengthen the easterly anomalies. The eddies appear to be organized by the formation of strong potential vorticity gradients on the subtropical flanks of the easterly anomaly. Similar wave activity and potential vorticity structures are found in the ERA-Interim for the observed QBO disruption, indicating this second feedback was active then. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425750200002 |
WOS关键词 | QUASI-BIENNIAL OSCILLATION ; BREWER-DOBSON CIRCULATION ; MIDDLE ATMOSPHERE ; MODEL ; REPRESENTATION ; REANALYSES ; SYSTEM ; BUDGET ; WAVES ; WINDS |
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/29325 |
专题 | 地球科学 |
作者单位 | 1.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 2.Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge, England; 3.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO USA; 4.Ecole Polytech, Lab Meteorol Dynam, Paris, France |
推荐引用方式 GB/T 7714 | Hitchcock, Peter,Haynes, Peter H.,Randel, William J.,et al. The Emergence of Shallow Easterly Jets within QBO Westerlies[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(1):21-40. |
APA | Hitchcock, Peter,Haynes, Peter H.,Randel, William J.,&Birner, Thomas.(2018).The Emergence of Shallow Easterly Jets within QBO Westerlies.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(1),21-40. |
MLA | Hitchcock, Peter,et al."The Emergence of Shallow Easterly Jets within QBO Westerlies".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.1(2018):21-40. |
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