DOI: 10.1002/2016MS000803
Scopus记录号: 2-s2.0-85016581082
论文题名: Coupling with ocean mixed layer leads to intraseasonal variability in tropical deep convection: Evidence from cloud-resolving simulations
作者: Anber U ; , Wang S ; , Sobel A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 1 起始页码: 616
结束页码: 626
语种: 英语
英文关键词: Heat storage
; Natural convection
; Tropical engineering
; Atmospheric convection
; Cloud resolving simulations
; Cloud-radiation interactions
; Intraseasonal oscillations
; Intraseasonal variability
; Large-scale circulation
; Tropical convection
; Weak temperature gradient approximations
; Oceanography
; atmospheric convection
; Coriolis force
; coupling
; heat flux
; mixed layer
; moisture flux
; oceanic convection
; parameterization
; radiative transfer
; seasonal variation
; temperature gradient
; threshold
; tropical region
; vertical profile
; wind shear
英文摘要: The effect of coupling a slab ocean mixed layer to atmospheric convection is examined in cloud-resolving model (CRM) simulations in vertically sheared and unsheared environments without Coriolis force, with the large-scale circulation parameterized using the Weak Temperature Gradient (WTG) approximation. Surface fluxes of heat and moisture as well as radiative fluxes are fully interactive, and the vertical profile of domain-averaged horizontal wind is strongly relaxed toward specified profiles with vertical shear that varies from one simulation to the next. Vertical wind shear is found to play a critical role in the simulated behavior. There exists a threshold value of the shear strength above which the coupled system develops regular oscillations between deep convection and dry nonprecipitating states, similar to those found earlier in a much more idealized model which did not consider wind shear. The threshold value of the vertical shear found here varies with the depth of the ocean mixed layer. The time scale of the spontaneously generated oscillations also varies with mixed layer depth, from 10 days with a 1 m deep mixed layer to 50 days with a 10 m deep mixed layer. The results suggest the importance of the interplay between convection organized by vertical wind shear, radiative feedbacks, large-scale dynamics, and ocean mixed layer heat storage in real intraseasonal oscillations. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75804
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: Program in Atmospheric and Oceanic Sciences, and the Geophysical Fluid Dynamics Laboratory, Princeton University, PrincetonNJ, United States; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States
Recommended Citation:
Anber U,, Wang S,, Sobel A. Coupling with ocean mixed layer leads to intraseasonal variability in tropical deep convection: Evidence from cloud-resolving simulations[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(1)