| DOI: | 10.1175/JCLI-D-11-00060.1
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| Scopus记录号: | 2-s2.0-84861355946
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| 论文题名: | Factors for the simulation of convectively coupled Kelvin waves |
| 作者: | Seo K.-H.; Choi J.-H.; Han S.-D.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2012
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| 卷: | 25, 期:10 | | 起始页码: | 3495
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| 结束页码: | 3514
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| 语种: | 英语
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| Scopus关键词: | Baroclinic mode
; Characteristic evolution
; Circulation anomalies
; Climate forecasts
; Convective downdrafts
; Convective rain
; Cumulus parameterization
; Deep convection
; Diabatic heating
; Eastward propagation
; Humid environment
; Kelvin waves
; Madden-Julian oscillation
; Major factors
; Mesoscale Convective System
; National centers for environmental predictions
; Realistic simulation
; Shallow convection
; Spectral signal
; Subgrid scale
; Tropical variabilty
; Vertical structures
; Climate models
; Clouds
; Computer simulation
; Evaporation
; Gravity waves
; Heating
; Phase transitions
; Rain
; Storms
; Coastal zones
; atmospheric convection
; cloud microphysics
; convective system
; cumulus
; heating
; Kelvin wave
; Madden-Julian oscillation
; parameterization
; stratiform cloud
; water vapor
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| 英文摘要: | This study investigates the major factors for the realistic simulation of convectively coupled Kelvin waves (CCKWs) using the National Centers for Environmental Prediction (NCEP) Climate Forecast System (CFS) models. CFS simulations employing relaxed Arakawa-Schubert (RAS; hereafter CTRL) and simplified Arakawa-Schubert (SAS) cumulus parameterization schemes show that the former generates the observed Kelvin wave signature more realistically than the latter does. For example, the space-time spectral signal, eastward propagation, and tilted (and second baroclinic mode) vertical structures in convection, temperature, moisture, and circulation anomalies associated with CCKWs in CTRL are more comparable to observations than in the SAS simulation. CTRL and observations demonstrate the characteristic evolution and vertical heating profile associated with CCKWs similar to those seen in mesoscale convective systems in the tropics: shallow convection, followed by deep convection and then stratiform cloudiness, and resulting in a top-heavy diabatic heating profile. Five additional experiments demonstrate that the effects of convective downdrafts, subgrid-scale convective rain evaporation, and large-scale rain evaporation on CCKWs are assessed to be insignificant in CTRL, possibly due to a more humid environment than observation. However, the Kelvin wave signals are reduced by;40% when shallow convection is disabled. More importantly, the removal of convective detrainment at the cloud top results in the greatest reduction in Kelvin wave activity (by more than 70%). Therefore, the preconditioning of the atmosphere by shallow convection and detrainment of water vapor and condensate from convective updrafts to the environment and subsequent stratiform heating (gridscale condensational heating)/precipitation processes are the two most crucial factors for the successful simulation of CCKWs. © 2012 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/52405
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Division of Earth Environmental System, Department of Atmospheric Sciences, Pusan National University, Busan, South Korea
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| Recommended Citation: | |
Seo K.-H.,Choi J.-H.,Han S.-D.. Factors for the simulation of convectively coupled Kelvin waves[J]. Journal of Climate,2012-01-01,25(10)
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