DOI: 10.1007/s00382-016-3092-9
Scopus记录号: 2-s2.0-84963649898
论文题名: Investigating the zonal wind response to SST warming using transient ensemble AGCM experiments
作者: Palipane E. ; Lu J. ; Staten P. ; Chen G. ; Schneider E.K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-01-02 起始页码: 523
结束页码: 540
语种: 英语
英文关键词: Effective diffusivity
; Finite amplitude wave activity
; Greenhouse warming
; Phase speed
; Wave reflection
英文摘要: The response of the atmospheric circulation to greenhouse gas-induced SST warming is investigated using large ensemble experiments with two AGCMs, with a focus on the robust feature of the poleward shift of the eddy driven jet. In these experiments, large ensembles of simulations are conducted by abruptly switching the SST forcing on from January 1st to focus on the wintertime circulation adjustment. A hybrid, finite amplitude wave activity budget analysis is performed to elucidate the nonlinear and irreversible aspects of the eddy-mean flow interaction during the adjustment of the zonal wind towards a poleward shifted state. The results confirm the results from earlier more idealized studies, particularly the importance of reduced dissipation of wave activity, in which the midlatitude decrease of effective diffusivity appears to be dominant. This reduction in dissipation increases the survival of midlatitude waves. These surviving waves, when reaching the upper propagation level in the upper troposphere, are subject to the influence of the increase of reflection phase speed at the poleward side of the mean jet, and thus more waves are reflected equatorward across the jet, giving rise to a poleward transport of momentum and thus an eddy momentum flux convergence for the poleward shift. The relative importance of wave breaking-induced PV mixing versus diabatic PV source in the evolution of the Lagrangian PV gradient is also investigated. The former plays the dominant role in the PV gradient formation during the initial phase of the jet shift, while the latter actually opposes the evolution of the Lagrangian PV gradient at times. © 2016, Springer-Verlag (outside the USA). 资助项目: GEO, Directorate for Geosciences
; DOE-SR, Savannah River Operations Office, U.S. Department of Energy
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53397
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States; Pacific Northwest National Laboratory, Richland, WA, United States; Department of Geological Sciences, Indiana University, Bloomington, IN, United States; Department of Atmospheric and Earth Sciences, Cornell University, Ithaca, NY, United States; Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, Fairfax, VA, United States
Recommended Citation:
Palipane E.,Lu J.,Staten P.,et al. Investigating the zonal wind response to SST warming using transient ensemble AGCM experiments[J]. Climate Dynamics,2017-01-01,48(2017-01-02)