DOI: 10.1029/2017JD027899
Scopus记录号: 2-s2.0-85049862740
论文题名: Resolution Dependence and Rossby Wave Modulation of Atmospheric Rivers in an Aquaplanet Model
作者: Swenson E.T. ; Lu J. ; Straus D.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 12 起始页码: 6297
结束页码: 6311
语种: 英语
英文关键词: atmospheric rivers
; resolution
; Rossby waves
Scopus关键词: amplitude
; CMIP
; numerical model
; Rossby wave
; simulated annealing
; simulation
; troposphere
; wave breaking
英文摘要: Atmospheric rivers (ARs) are examined in a set of aquaplanet simulations using the Model for Prediction Across Scales dynamical core run at multiple horizontal resolutions, namely, 240, 120, and 60 km. As the resolution is increased, there is an increase in the occurrence of long-lasting ARs. At the same time there is also an increase in the local finite-amplitude wave activity (LWA) of upper-tropospheric absolute vorticity, a measure for Rossby wave phase and amplitude that is closely linked with wave breaking. Consistent with the notion that changes in ARs are driven by midlatitude dynamics, a strong relationship is identified between ARs and the equatorward component of LWA. A logistic regression model is used to quantify the probability of AR occurrence based solely on LWA and explains most of the change in AR frequency with resolution. LWA is a diagnostic that may be easily applied to the broadly available output of phase 6 of the Coupled Model Intercomparison project and other model simulations, thus enabling scientists to infer AR and Rossby wave characteristics. AR characteristics, in particular, require higher-resolution moisture and winds at multiple levels that are not always easily available. ©2018. 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/113682
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, VA, United States; Pacific Northwest National Laboratory, Richland, WA, United States; Department of Atmospheric, Oceanic, and Earth Sciences, College of Science, George Mason University, Fairfax, VA, United States
Recommended Citation:
Swenson E.T.,Lu J.,Straus D.M.. Resolution Dependence and Rossby Wave Modulation of Atmospheric Rivers in an Aquaplanet Model[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(12)