DOI: 10.1002/jgrd.50812
论文题名: Sensitivity of stratospheric dynamics and chemistry to QBO nudging width in the chemistry-climate model WACCM
作者: Hansen F. ; Matthes K. ; Gray L.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 18 起始页码: 10464
结束页码: 10474
语种: 英语
英文关键词: Holton-Tan mechanism
; QBO nudging
; quasi-biennial oscillation
; stratospheric dynamics and chemistry
; stratospheric modeling
Scopus关键词: Atmospheric chemistry
; Climate models
; Computer simulation
; Dynamics
; Flow interactions
; Methane
; Oscillators (mechanical)
; Upper atmosphere
; Wave propagation
; Chemistry-climate models
; Meridional circulation
; Meridional temperature gradient
; National center for atmospheric researches
; QBO nudging
; Quasi-biennial oscillation
; Wave-mean-flow interaction
; Whole atmosphere community climate models
; Chemical analysis
; climate modeling
; climate oscillation
; meridional circulation
; Northern Hemisphere
; sensitivity analysis
; statistical analysis
; stratosphere
; wave propagation
英文摘要: The consequences of different quasi-biennial oscillation (QBO) nudging widths on stratospheric dynamics and chemistry are analyzed by comparing two model simulations with the National Center for Atmospheric Research's Whole Atmosphere Community Climate Model (WACCM) where the width of the QBO is varied between 22° and 8.5° north and south. The sensitivity to the nudging width is strongest in Northern Hemisphere (NH) winter where the Holton-Tan effect in the polar stratosphere, i.e., stronger zonal mean winds during QBO west phases, is enhanced for the wider compared to the narrower nudging case. The differences between QBO west and east conditions for the two model experiments can be explained with differences in wave propagation, wave-mean flow interaction, and the residual circulation. In the wider nudging case, a divergence anomaly in the midlatitude upper stratosphere/lower mesosphere occurs together with an equatorward anomaly of the residual circulation. This seems to result in a strengthening of the meridional temperature gradient and hence a significant strengthening of the polar night jet (PNJ). In the narrower nudging case, these circulation changes are weaker and not statistically significant, consistent with a weaker and less significant impact on the PNJ. Chemical tracers like ozone, water vapor, and methane react accordingly. From a comparison of westerly minus easterly phase composite differences in the model to reanalysis and satellite data, we conclude that the standard WACCM configuration (QBO22) generates more realistic QBO effects in stratospheric dynamics and chemistry during NH winter. Our study also confirms the importance of the secondary mean meridional circulation associated with the QBO for the Holton-Tan effect. Key Points The sensitivity to QBO nudging width is strongest in NH winterHolton-Tan effect in the polar stratosphere is enhanced for the wider nudgingWave-mean flow interactions explain differences between QBO west and east ©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/63292
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: GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany; Centre for Atmospheric Sciences, Department of Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, United Kingdom
Recommended Citation:
Hansen F.,Matthes K.,Gray L.J.. Sensitivity of stratospheric dynamics and chemistry to QBO nudging width in the chemistry-climate model WACCM[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(18)