On the semiannual formation of large scale three‐dimensional vortices at the stratopause

doi:10.1029/2020GL090072

An examination of the dynamics of the middle atmosphere as reconstructed in the NASA Modern‐Era Retrospective analysis for Research and Applications, Version 2 (MERRA‐2) reveals the formation of large scale three‐dimensional (3D) vortices in the tropical stratosphere following both the vernal and autumnal equinoxes at times when the jet associated with the westerly phase of the semiannual oscillation (SAO) is maximal and extratropical influences from planetary waves are weakest. An empirical orthogonal function (EOF) analysis of the second matrix invariant of the velocity gradient tensor applied to the shear zones about the SAO reveals statistically stationary wave‐5 vortex structures that span more than 3200km in length and up to 40km in the vertical. Eliassen‐Palm fluxes suggests the vortices are maintained by a combination of local (shear zones) and remote (vertically propagating tropical) sources of momentum. These large scale coherent features appear to be unique to the stratopause.

DOI	10.1029/2020GL090072
	On the semiannual formation of large scale three‐dimensional vortices at the stratopause
	Terence J. O'Kane; Vassili Kitsios; Mark A. Collier
	2020-12-29
发表期刊	Geophysical Research Letters
出版年	2020
英文摘要	An examination of the dynamics of the middle atmosphere as reconstructed in the NASA Modern‐Era Retrospective analysis for Research and Applications, Version 2 (MERRA‐2) reveals the formation of large scale three‐dimensional (3D) vortices in the tropical stratosphere following both the vernal and autumnal equinoxes at times when the jet associated with the westerly phase of the semiannual oscillation (SAO) is maximal and extratropical influences from planetary waves are weakest. An empirical orthogonal function (EOF) analysis of the second matrix invariant of the velocity gradient tensor applied to the shear zones about the SAO reveals statistically stationary wave‐5 vortex structures that span more than 3200km in length and up to 40km in the vertical. Eliassen‐Palm fluxes suggests the vortices are maintained by a combination of local (shear zones) and remote (vertically propagating tropical) sources of momentum. These large scale coherent features appear to be unique to the stratopause.
领域	气候变化
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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/311411
专题	气候变化
推荐引用方式 GB/T 7714	Terence J. O'Kane,Vassili Kitsios,Mark A. Collier. On the semiannual formation of large scale three‐dimensional vortices at the stratopause[J]. Geophysical Research Letters,2020.
APA	Terence J. O'Kane,Vassili Kitsios,&Mark A. Collier.(2020).On the semiannual formation of large scale three‐dimensional vortices at the stratopause.Geophysical Research Letters.
MLA	Terence J. O'Kane,et al."On the semiannual formation of large scale three‐dimensional vortices at the stratopause".Geophysical Research Letters (2020).

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