DOI: 10.1002/2016MS000743
Scopus记录号: 2-s2.0-85000983826
论文题名: Sources and pathways of the upscale effects on the Southern Hemisphere jet in MPAS-CAM4 variable-resolution simulations
作者: Sakaguchi K ; , Lu J ; , Leung L ; R ; , Zhao C ; , Li Y ; , Hagos S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 4 起始页码: 1786
结束页码: 1805
语种: 英语
英文关键词: Atmospheric radiation
; Cloud radiative forcing
; Community atmosphere model
; Computationally efficient
; High resolution simulations
; Large-scale circulation
; Southern Hemisphere
; Upscale effects
; Variable resolution
; Mechanical waves
; atmospheric modeling
; baroclinic mode
; climate modeling
; cloud radiative forcing
; Hadley cell
; jet stream
; numerical method
; precipitation (climatology)
; Rossby wave
; simulation
; Southern Hemisphere
; standing wave
; teleconnection
; wave propagation
; Asia
; North America
; South America
英文摘要: Impacts of regional grid refinement on large-scale circulations (“upscale effects”) were detected in a previous study that used the Model for Prediction Across Scales-Atmosphere coupled to the physics parameterizations of the Community Atmosphere Model version 4. The strongest upscale effect was identified in the Southern Hemisphere jet during austral winter. This study examines the detailed underlying processes by comparing two simulations at quasi-uniform resolutions of 30 and 120 km to three variable-resolution simulations in which the horizontal grids are regionally refined to 30 km in North America, South America, or Asia from 120 km elsewhere. In all the variable-resolution simulations, precipitation increases in convective areas inside the high-resolution domains, as in the reference quasi-uniform high-resolution simulation. With grid refinement encompassing the tropical Americas, the increased condensational heating expands the local divergent circulations (Hadley cell) meridionally such that their descending branch is shifted poleward, which also pushes the baroclinically unstable regions, momentum flux convergence, and the eddy-driven jet poleward. This teleconnection pathway is not found in the reference high-resolution simulation due to a strong resolution sensitivity of cloud radiative forcing that dominates the aforementioned teleconnection signals. The regional refinement over Asia enhances Rossby wave sources and strengthens the upper level southerly flow, both facilitating the cross-equatorial propagation of stationary waves. Evidence indicates that this teleconnection pathway is also found in the reference high-resolution simulation. The result underlines the intricate diagnoses needed to understand the upscale effects in global variable-resolution simulations, with implications for science investigations using the computationally efficient modeling framework. © 2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75853
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: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Beijing, China
Recommended Citation:
Sakaguchi K,, Lu J,, Leung L,et al. Sources and pathways of the upscale effects on the Southern Hemisphere jet in MPAS-CAM4 variable-resolution simulations[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(4)