DOI: 10.1002/2015JD023488
论文题名: Chemical definition of the mesospheric polar vortex
作者: Harvey V.L. ; Randall C.E. ; Collins R.L.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期: 19 起始页码: 10166
结束页码: 10179
语种: 英语
英文关键词: carbon monoxide
; mesosphere
; polar vortex
; stratosphere
Scopus关键词: algorithm
; carbon monoxide
; mesosphere
; microwave limb sounder
; polar vortex
; potential vorticity
; spatiotemporal analysis
; stratosphere
; wind field
; Arctic
英文摘要: We present a simple chemical definition to demark the edge of the mesospheric polar vortices. Because this vortex definition does not rely on the wind field, it is useful in the mesosphere where wind observations are sparse and reanalysis winds are unreliable. The chemical definition is also insensitive to double jets that complicate vortex identification in the mesosphere. The algorithm is based on horizontal gradients of carbon monoxide (CO) and mirrors the widely used vortex edge definition in the stratosphere based on potential vorticity (PV) gradients. Here the approach is used to identify the Arctic vortex in the mesosphere during a 10 year (2004-2014) record of Microwave Limb Sounder data. Vortex size and shape comparisons are made where the CO and PV methods overlap in the upper stratosphere. A case study is presented during the NH 2008-2009 winter that demonstrates the fidelity of the CO gradient method on individual days and emphasizes the impact of double jets on methods to identify the polar vortex. We recommend transitioning from a PV or stream function-based vortex definition in the stratosphere to using a CO gradient definition above 0.1 hPa (~60 km). The CO gradient method identifies a coherent region of high CO at 80 km that is confined to mid-to-high latitudes 99.8% of the time during Arctic winter. Taking advantage of the CO gradient method to identify the polar vortex adds ~20 km of reliable vortex information (from 60 to 80 km) in a region of the atmosphere where reanalyses are most suspect. ©2015. 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/63010
Appears in Collections: 影响、适应和脆弱性 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, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Harvey V.L.,Randall C.E.,Collins R.L.. Chemical definition of the mesospheric polar vortex[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)