DOI: 10.1002/2016JD025235
论文题名: Comparison of simulated and observed convective gravity waves
作者: Kalisch S. ; Chun H.-Y. ; Ern M. ; Preusse P. ; Trinh Q.T. ; Eckermann S.D. ; Riese M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 22 起始页码: 474
结束页码: 492
语种: 英语
英文关键词: convection
; gravity waves
; SABER
; simulation
Scopus关键词: comparative study
; convection
; gravity wave
; middle atmosphere
; numerical method
; three-dimensional modeling
; troposphere
; wave propagation
; wavelength
; wavelet analysis
英文摘要: Gravity waves (GWs) from convection have horizontal wavelengths typically shorter than 100 km. Resolving these waves in state-of-the-art atmospheric models still remains challenging. Also, their time-dependent excitation process cannot be represented by a common GW drag parametrization with static launch distribution. Thus, the aim of this paper is to investigate the excitation and three-dimensional propagation of GWs forced by deep convection in the troposphere and estimate their influence on the middle atmosphere. For that purpose, the GW ray tracer Gravity-wave Regional Or Global Ray Tracer (GROGRAT) has been coupled to the Yonsei convective GW source model. The remaining free model parameters have been constrained by measurements. This work led to a coupled convective GW model representing convective GWs forced from small cells of deep convection up to large-scale convective clusters. In order to compare our simulation results with observed global distributions of momentum flux, limitations of satellite instruments were taken into account: The observational filter of a limb-viewing satellite instrument restricts measurements of GWs to waves with horizontal wavelengths longer than 100 km. Convective GWs, however, often have shorter wavelengths. This effect is taken into account when comparing simulated and observable GW spectra. We find good overall agreement between simulated and observed GW global distributions, if superimposed with a nonorographic background spectrum for higher-latitude coverage. Our findings indicate that parts of the convective GW spectrum can indeed be observed by limb-sounding satellites. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: KA4222/2-1
; PR 919/4-1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62789
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: Institute of Energy and Climate Research, IEK-7: Stratosphere, Jülich, Germany; Department of Atmospheric Science, Yonsei University, Seoul, South Korea; Naval Research Laboratory, Washington, DC, United States; Institute of Atmospheric and Environmental Research, University of Wuppertal, Wuppertal, Germany
Recommended Citation:
Kalisch S.,Chun H.-Y.,Ern M.,et al. Comparison of simulated and observed convective gravity waves[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)