DOI: 10.1002/jgrd.50474
论文题名: Gravity wave variations during elevated stratopause events using SABER observations
作者: Yamashita C. ; England S.L. ; Immel T.J. ; Chang L.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 11 起始页码: 5287
结束页码: 5303
语种: 英语
英文关键词: Elevated Stratopause
; Gravity Wave
; Planetary Wave
; SABER
; Stratospheric Sudden Warming
Scopus关键词: Ionosphere
; Elevated Stratopause
; Lower thermosphere
; Planetary Waves
; Ray tracing simulation
; SABER
; Sounding of the atmosphere using broadband emission radiometry
; Stratospheric sudden warmings
; Temperature observations
; Gravity waves
; gravity wave
; jet
; observational method
; planetary wave
; radiometer
; ray tracing
; stratosphere
; thermosphere
; warming
; wave modeling
; wave propagation
英文摘要: Elevated stratopauses formed at ∼80-90 km altitude during the recovery phase of stratospheric sudden warmings in February 2006 and 2009. These likely occurred in response to changes in the downward circulation due to gravity waves (GWs) and/or planetary waves in the mesosphere and the lower thermosphere (MLT). However, the physical mechanisms are not fully understood, due in part to the lack of global GW observations in the MLT. This study presents global-scale GW observations in the MLT during elevated stratopause events using Thermosphere, Ionosphere, Mesosphere Energetics Dynamics (TIMED)-Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature observation, which provide a better insight into the formation of an elevated stratopause. During the downward movement of elevated stratopause events in 2006 and 2009, GWs were suppressed below ∼60 km and enhanced above ∼60 km at high latitudes compared to non-elevated stratopause years (2005 and 2007). Global SABER GW observations indicate that the regions of GW enhancement propagate from low-mid latitudes to high latitudes in association with the equatorward shift of the polar night jet during elevated stratopause events. Ray-tracing simulations show enhancements of the poleward propagation of GWs during elevated stratopause events as well as continuous propagation of non-orographic GWs within high latitudes. Therefore, our results suggest that meridional propagation of GWs from lower to higher latitudes, which is typically not included in global-scale models, plays an important role in determining GW variations and thus the downward movement of an elevated stratopause, in addition to non-orographic GWs originating at high latitudes. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1139165
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63700
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: Space Science Laboratory, University of California, 7 Gauss Way, Berkeley, CA 94720, United States; Institute of Space Science, National Central University, Jhongli, Taiwan
Recommended Citation:
Yamashita C.,England S.L.,Immel T.J.,et al. Gravity wave variations during elevated stratopause events using SABER observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(11)