DOI: 10.1175/JCLI-D-12-00103.1
Scopus记录号: 2-s2.0-84872924851
论文题名: Tropical intraseasonal variability in version 3 of the GFDL atmosphere model
作者: Benedict J.J. ; Maloney E.D. ; Sobel A.H. ; Frierson D.M. ; Donner L.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 2 起始页码: 426
结束页码: 449
语种: 英语
Scopus关键词: Atmosphere models
; Control model
; Cumulus parameterization
; Deep convection
; Diabatic heating
; Heating structures
; Indian ocean
; Intraseasonal variability
; Kelvin waves
; Mesoscale
; Microphysical process
; Moisture convergence
; Pacific ocean
; Radiation field
; Shallow cumulus convection
; Tropical intraseasonal variability
; Vertical velocity
; Clouds
; Heating
; Moisture
; Computer simulation
; atmospheric modeling
; cloud cover
; cloud microphysics
; convective cloud
; cumulus
; Kelvin wave
; Madden-Julian oscillation
; mesoscale meteorology
; parameterization
; seasonal variation
; Indian Ocean
; Pacific Ocean
英文摘要: Tropical intraseasonal variability is examined in version 3 of the Geophysical FluidDynamics Laboratory Atmosphere Model (AM3). In contrast to its predecessorAM2, AM3 uses a new treatment of deep and shallow cumulus convection and mesoscale clouds. The AM3 cumulus parameterization is a massflux-based scheme but also, unlike that in AM2, incorporatessubgrid-scale vertical velocities; these play a key role in cumulus microphysical processes. The AM3 convection scheme allows multiphase water substance produced in deep cumuli to be transported directly into mesoscale clouds, which strongly influence large-scale moisture and radiation fields. The authors examine four AM3 simulations using a control model and three versions with different modifications to the deep convection scheme. In the control AM3, using a convective closure based on CAPE relaxation, both MJO and Kelvin waves are weak relative to those in observations. By modifying the convective closure and trigger assumptions to inhibit deep cumuli, AM3 produces reasonable intraseasonal variability but a degraded mean state. MJO-like disturbances in the modified AM3 propagate eastwardat roughly the observed speed in the Indian Ocean but up to 2 times the observed speed inthe west Pacific Ocean. Distinct differences in intraseasonal convective organization andpropagation exist among the modified AM3 versions. Differences in vertical diabatic heating profiles associated with the MJO are also found. The two AM3 versions with the strongest intraseasonal signals have a more prominent "bottom heavy" heating profile leading the disturbance center and "top heavy" heating profile following the disturbance. The more realistic heating structures are associated with an improved depiction of moisture convergence and intraseasonal convective organization in AM3. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52071
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Department of Applied Mathematics, Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; NOAA, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Benedict J.J.,Maloney E.D.,Sobel A.H.,et al. Tropical intraseasonal variability in version 3 of the GFDL atmosphere model[J]. Journal of Climate,2013-01-01,26(2)