DOI: 10.1002/jgrd.50869
论文题名: Global observations of gravity wave intermittency and its impact on the observed momentum flux morphology
作者: Wright C.J. ; Osprey S.M. ; Gille J.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 10980
结束页码: 10993
语种: 英语
英文关键词: gravity waves
; intermittency
; mesosphere
; observations
; stratosphere
Scopus关键词: Gravity waves
; Morphology
; NASA
; Upper atmosphere
; Wave packets
; Global distribution
; Global observation
; Gravity wave momentum
; High-resolution dynamics limb sounders
; Intermittency
; mesosphere
; observations
; Tropical latitudes
; Momentum
; altitude
; Aura (satellite)
; global perspective
; gravity wave
; momentum transfer
; ocean
; orography
英文摘要: Three years of gravity wave observations from the High Resolution Dynamics Limb Sounder instrument on NASA's Aura satellite are examined. We produce estimates of the global distribution of gravity wave momentum flux as a function of individual observed wave packets. The observed distribution at the 25 km altitude level is dominated by the small proportion of wave packets with momentum fluxes greater than ∼0.5 mPa. Depending on latitude and season, these wave packets only comprise ∼7-25% of observations, but are shown to be almost entirely responsible for the morphology of the observed global momentum flux distribution. Large-amplitude wave packets are found to be more important over orographic regions than over flat ocean regions, and to be especially high in regions poleward of 40°S during austral winter. The momentum flux carried by the largest packets relative to the distribution mean is observed to decrease with height over orographic wave generation regions, but to increase with height at tropical latitudes; the mesospheric intermittency resulting is broadly equivalent in both cases. Consistent with previous studies, waves in the top 10% of the extratropical distribution are observed to carry momentum fluxes more than twice the mean and waves in the top 1% more than 10× the mean, and the Gini coefficient is found to characterize the observed distributions well. These results have significant implications for gravity wave modeling. Key Points Observed GW distribution dominated by wave packets with MF>0.5 mPa Intermittency higher over orography Gini coefficient confirmed as a good metric for wave intermittency ©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/63260
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: Atmospheric Chemistry Division, National Center for Atmospheric Research, Mitchell Lane, Boulder, CO 80301, United States; Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, United Kingdom; National Center for Atmospheric Science, Leeds, United Kingdom; Center for Limb Atmosphere Sounding, University of Colorado Boulder, Boulder CO, United States
Recommended Citation:
Wright C.J.,Osprey S.M.,Gille J.C.. Global observations of gravity wave intermittency and its impact on the observed momentum flux morphology[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)