DOI: 10.1002/jgrd.50717
论文题名: Eastward propagating planetary waves with periods of 1-5 days in the winter Antarctic stratosphere as revealed by MERRA and lidar
作者: Lu X. ; Chu X. ; Fuller-Rowell T. ; Chang L. ; Fong W. ; Yu Z.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 9565
结束页码: 9578
语种: 英语
英文关键词: eastward propagating planetary waves
; Eliassen-Palm flux
; Fe Boltzmann lidar
; jet instability
; MERRA
; winter Antarctic stratosphere
Scopus关键词: Heat flux
; Optical radar
; Refractive index
; Stability
; Antarctic stratosphere
; Boltzmann
; Eliassen-Palm flux
; Jet instability
; MERRA
; Planetary Waves
; Atmospherics
; heat flux
; latitude
; lidar
; meridional circulation
; planetary wave
; stratosphere
; temperature effect
; wave propagation
; winter
; Antarctica
英文摘要: This study presents the first report of planetary wave (PW) influences on significant temperature perturbations (10-20 K) within a course of one day detected by an Fe lidar from 35 to 51 km in the austral winter of 2011 at McMurdo (77.8°S, 166.7°E), Antarctica. Such large temperature perturbations are captured in the Modern Era Retrospective-Analysis for Research and Applications (MERRA) data and correspond to various phases of eastward propagating PWs with periods of 1-5 days as revealed in MERRA. The strongest PW dominating the temperature perturbations has a period of 4-5 days with wavenumber -1. A 2-day wave with wavenumber -2 and a 1.25-day wave with wavenumber -3 also have significant influences. We find that these eastward propagating PWs are highly confined to winter high latitudes, likely because negative refractive indices equatorward of ~45°S result in evanescent wave characteristics and prevent the PWs from propagating to lower latitudes. The Eliassen-Palm flux divergence and instability analyses suggest that barotropic/baroclinic instability at 50°S-60°S induced by the stratospheric polar night jet and/or the "double-jet" structure is the most likely wave source. Such instability in the region poleward of 70°S is a complementary source for the 4-day wave, where we find that the heat flux of the 4-day wave is large and transported from ~70°S toward the pole above 40 km. This transport direction is likely linked to the meridional gradient of background temperature. The migrating diurnal tide near 78°S in the upper stratosphere is discernable, but significantly smaller than that of the dominant 4-day wave. Key Points First report of PW influences on lidar temperatures in polar stratosphere.The PWs are generated by the instability of the double-jet structure.Significant momentum and heat fluxes are linked with the dominating PWs. ©2013. American Geophysical Union. All Rights Reserved. 资助项目: ANT-0839091
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63345
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: Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Box 216, Boulder, CO 80309-0216, United States; Department of Aerospace Engineering Sciences, University of Colorado at Boulder, Boulder, CO, United States; Space Weather Prediction Center, NOAA, Boulder, CO, United States; Institute of Space Science, National Central University, Jhongli, Taiwan
Recommended Citation:
Lu X.,Chu X.,Fuller-Rowell T.,et al. Eastward propagating planetary waves with periods of 1-5 days in the winter Antarctic stratosphere as revealed by MERRA and lidar[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)