DOI: 10.1029/2018JD028815
Scopus记录号: 2-s2.0-85052968309
论文题名: On the Upward Extension of the Polar Vortices Into the Mesosphere
作者: Harvey V.L. ; Randall C.E. ; Goncharenko L. ; Becker E. ; France J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 17 起始页码: 9171
结束页码: 9191
语种: 英语
英文关键词: atmospheric coupling
; dynamics
; mesosphere
; planetary wave
; polar vortex
; stratosphere
英文摘要: The polar vortices play a central role in vertically coupling the atmosphere from the ground to geospace by shaping the background wind field through which atmospheric waves propagate. This work extends the vertical range of previous polar vortex climatologies into the upper mesosphere. The mesospheric polar vortices are defined using the CO gradient method with Microwave Limb Sounder satellite data; the stratospheric polar vortices are defined using a stream function-based algorithm with data from meteorological reanalyses. Strengths and weaknesses of the two vortex definitions are given, as well as recommendations for when, where, and why to use each definition. Midwinter mean vortex geometry in the mesosphere is funnel shaped in the Arctic, with a wide top and narrow bottom. The Antarctic mesospheric vortex tapers with height in early winter and broadens with height in late winter. The seasonal evolution of mesospheric vortex frequency of occurrence, size, and zonal symmetry in both hemispheres is presented. Unexpected behavior above 60 km includes late season vortex broadening in both hemispheres, especially following winters without sudden stratospheric warmings. Following extreme stratospheric disturbances the polar night jet in the mesosphere strengthens and shifts poleward, resulting in a mesospheric vortex that contracts. Overall, the mesospheric polar vortices are more similar between the two hemispheres than their stratospheric counterparts. The vortex climatology presented here serves as an observational benchmark to which the mesospheric polar vortices in high-top climate models can be evaluated. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113218
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; MIT Haystack Observatory, Westford, MA, United States; Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany; GATS, Inc., Boulder, CO, United States
Recommended Citation:
Harvey V.L.,Randall C.E.,Goncharenko L.,et al. On the Upward Extension of the Polar Vortices Into the Mesosphere[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(17)