DOI: 10.1002/jgrd.50319
论文题名: Stationary waves in the wintertime mesosphere: Evidence for gravity wave filtering by stratospheric planetary waves
作者: Lieberman R.S. ; Riggin D.M. ; Siskind D.E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 8 起始页码: 3139
结束页码: 3149
语种: 英语
英文关键词: Waves
Scopus关键词: Budget control
; Gravity waves
; Temperature measurement
; Waves
; Coriolis acceleration
; Gravity wave filtering
; Mesosphere and lower thermosphere
; Nonorographic gravity wave drag
; Observational study
; Operational predictions
; Pressure gradient force
; Stationary waves
; Drag
; Coriolis force
; gravity wave
; mesosphere
; momentum
; planetary wave
; stratosphere
英文摘要: Quasi-stationary planetary-scale waves in the wintertime mesosphere and lower thermosphere (MLT) are thought to be forced in part by drag imparted by gravity waves that have been modulated by underlying stratospheric waves. Although this mechanism has been demonstrated numerically, there have been very few observational studies that examine wave driving as a source of planetary waves in the MLT. This study uses data from EOS Aura and TIMED between 2005 and 2011 to examine the momentum budget of MLT wintertime planetary waves. Monthly averages for January indicate that the dynamics of zonal wave number 1 are determined from a three-way balance among the Coriolis acceleration, the pressure gradient force, and a momentum residual term that reflects wave drag. The MLT circulations in January 2005, 2006, 2009, and 2011 are qualitatively consistent with a simple model of wave forcing by drag from gravity waves that have been modulated by stratospheric planetary waves. MLT winds during these years are also consistent with analyses from a high-altitude operational prediction model that includes parameterized nonorographic gravity wave drag. The importance of wave drag for the MLT momentum budget suggests that the gradient wind approximation is inadequate for deriving planetary-scale winds from global temperature measurements. Our results underscore the need for direct global wind measurements in the MLT. ©2013. 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/63821
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: Northwest Research Associates, Boulder CO, United States; GATS, Inc., 3360 Mitchell Ln., Boulder, CO 80301, United States; Space Science Division, Naval Research Laboratory, Washington DC, United States
Recommended Citation:
Lieberman R.S.,Riggin D.M.,Siskind D.E.. Stationary waves in the wintertime mesosphere: Evidence for gravity wave filtering by stratospheric planetary waves[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(8)