DOI: 10.1002/jgrd.50705
论文题名: A stochastic parameterization of the gravity waves due to convection and its impact on the equatorial stratosphere
作者: Lott F. ; Guez L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 8897
结束页码: 8909
语种: 英语
Scopus关键词: Heating rate
; Momentum
; Precipitation (meteorology)
; Probability distributions
; Stochastic systems
; Upper atmosphere
; Equatorial stratosphere
; General circulation model
; Global precipitation
; Gravity wave momentum
; Monochromatic gravity waves
; Quasi-biennial oscillation
; Semiannual oscillations
; Vertical resolution
; Gravity waves
; amplitude
; atmospheric convection
; climatology
; general circulation model
; gravity wave
; heating
; parameterization
; precipitation (climatology)
; probability
; quasi-biennial oscillation
; semiannual oscillation
; stochasticity
; stratosphere
英文摘要: A formalism is proposed to parameterize the gravity waves due to convection in general circulation models with a stratosphere. It is based on a stochastic approach, where a large ensemble of monochromatic gravity waves is built up by launching a few waves at each time step, and by adding the effect of these waves, to that of the waves launched before, during the same day. The frequency and horizontal wave numbers of each wave are chosen randomly with fixed probability distribution, but the wave amplitude is directly related to precipitation, which is converted into heating rate. Linear theory is then used to predict the gravity wave generated by the heating rate. Off-line tests are carried out using reanalysis and global precipitation data. These tests demonstrate that the scheme launches gravity wave momentum fluxes that are much more erratic in amplitude than when uniform sources are considered. Consequently, the scheme tends to produce momentum flux deposition at lower levels than for the case when uniform sources are considered. We verify that the parameterization, when included in a general circulation model with vertical resolution in the stratosphere δz ~500m, is able to produce a quasi-biennial oscillation, without being detrimental to other aspects of the model climatology, like the semiannual oscillation and the behavior of the extratropics. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63395
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: Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris CEDEX 05, France
Recommended Citation:
Lott F.,Guez L.. A stochastic parameterization of the gravity waves due to convection and its impact on the equatorial stratosphere[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)