DOI: 10.1002/2015MS000529
Scopus记录号: 2-s2.0-84956867509
论文题名: Modeling the MJO in a cloud-resolving model with parameterized large-scale dynamics: Vertical structure, radiation, and horizontal advection of dry air
作者: Wang S ; , Sobel A ; H ; , Nie J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 1 起始页码: 121
结束页码: 139
语种: 英语
英文关键词: Advection
; Dynamics
; Heat radiation
; Moisture
; Parameterization
; Plasma theory
; Radiant heating
; Temperature
; Thermal gradients
; CINDY/DYNAMO
; Cloud resolving model
; Equatorial Indian Ocean
; Horizontal advection
; Large-scale dynamics
; Madden-Julian oscillation
; Numerical experiments
; Weak temperature gradient approximations
; Climatology
; advection
; air-sea interaction
; atmospheric moisture
; cloud cover
; gravity wave
; Madden-Julian oscillation
; precipitation (climatology)
; temperature gradient
; Indian Ocean
; Indian Ocean (Equatorial)
英文摘要: Two Madden-Julian Oscillation (MJO) events, observed during October and November 2011 in the equatorial Indian Ocean during the DYNAMO field campaign, are simulated in a limited-area cloud-resolving model using parameterized large-scale dynamics. Three parameterizations of large-scale dynamics - the conventional weak temperature gradient (WTG) approximation, vertical mode-based spectral WTG (SWTG), and damped gravity wave coupling (DGW) - are employed. A number of changes to the implementation of the large-scale parameterizations, as well as the model itself, are made and lead to improvements in the results. Simulations using all three methods, with imposed time-dependent radiation and horizontal moisture advection, capture the time variations in precipitation associated with the two MJO events well. The three methods produce significant differences in the large-scale vertical motion profile, however. WTG produces the most top-heavy profile, while DGW's is less so, and SWTG produces a profile between the two, and in better agreement with observations. Numerical experiments without horizontal advection of moisture suggest that that process significantly reduces the precipitation and suppresses the top-heaviness of large-scale vertical motion during the MJO active phases. Experiments in which a temporally constant radiative heating profile is used indicate that radiative feedbacks significantly amplify the MJO. Experiments in which interactive radiation is used produce agreement with observations that is much better than that achieved in previous work, though not as good as that with imposed time-varying radiative heating. Our results highlight the importance of both horizontal advection of moisture and radiative feedbacks to the dynamics of the MJO. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75929
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: Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, NY, United States
Recommended Citation:
Wang S,, Sobel A,H,et al. Modeling the MJO in a cloud-resolving model with parameterized large-scale dynamics: Vertical structure, radiation, and horizontal advection of dry air[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(1)