DOI: 10.1002/2013MS000286
Scopus记录号: 2-s2.0-84899093835
论文题名: A convection-based gravity wave parameterization in a general circulation model: Implementation and improvements on the QBO
作者: Schirber S ; , Manzini E ; , Alexander M ; J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期: 1 起始页码: 264
结束页码: 279
语种: 英语
英文关键词: Climate models
; Gravity waves
; Atmospheric general circulation models
; Convective properties
; General circulation model
; QBO
; Quasi-biennial oscillation
; Spatial and temporal variability
; The standard model
; Wave characteristics
; Parameterization
; atmospheric general circulation model
; climate modeling
; gravity wave
; heating
; oceanic convection
; parameterization
; quasi-biennial oscillation
; spatial variation
; stratosphere
; temporal variation
; tropical region
; wind velocity
英文摘要: In order to simulate stratospheric phenomena, such as the Quasi-Biennial Oscillation (QBO), atmospheric general circulation models (GCM) require parameterizations of small-scale gravity waves (GW). In the tropics, the main source of GWs is convection, showing high spatial and temporal variability in occurrence and strength. In this study, we implement in the GCM ECHAM6 a source parameterization for GWs forced by convection. The GW source parameterization is based on the convective heating depth, convective heating rate, and the background wind. First, we show that the heating depth distribution of convective properties strongly influences the waves' source spectra. The strong sensitivity of spectral wave characteristics on heating property distributions highlights the importance of a realistic parameterization of convective processes in a GCM. Second, with the convection-based GW scheme as the unique source of GWs, the GCM simulates a QBO with realistic features. While the vertical extent of the easterly jet shows deficiencies, the wind speeds of the jet maxima and the variance of wind alteration show a clear improvement, compared to the standard model which employs a parameterization with constant, prescribed GW sources. Furthermore, the seasonality of the QBO jets downward progression is modeled more realistically due to the seasonality of physically based gravity wave sources. Key Points Implementation of a convection-based GW source parameterization into a GCM Explore physical aspects of convection-based GW source parameterization Physical GW parameterization improves QBO © 2014. 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/76090
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; NorthWest Research, Colorado Research Division, Boulder CO, United States
Recommended Citation:
Schirber S,, Manzini E,, Alexander M,et al. A convection-based gravity wave parameterization in a general circulation model: Implementation and improvements on the QBO[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(1)