DOI: 10.1007/s00382-016-3033-7
Scopus记录号: 2-s2.0-84975704352
论文题名: Role of stratiform heating on the organization of convection over the monsoon trough
作者: Ajayamohan R.S. ; Khouider B. ; Majda A.J. ; Deng Q.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 12 起始页码: 3641
结束页码: 3660
语种: 英语
英文关键词: Low pressure systems
; Monsoon Intraseasonal oscillations
; Monsoon trough
; Northward propagation
; Organized convection
; Stochastic parametrization
; Stratiform heating
英文摘要: It has been recently demonstrated that stratiform heating plays a critical role in the scale-selection of organized tropical convection, in an aquaplanet version of a coarse-resolution atmospheric general circulation model coupled to a stochastic multicloud cumulus parameterization scheme. It is shown that Madden–Julian oscillation-like organization dominates when the model is tuned to produce strong and long lived stratiform heating while it gives rise to mostly convectively coupled waves in the case of weak and short lived stratiform clouds. The study is extended here to the case of an asymmetric forcing mimicking the migration of the intertropical convergence zone (ITCZ) during summer to understand the impact of changes in stratiform heating on the monsoon dynamics. Consistent with the equatorial ITCZ case, strong and long lived stratiform heating promotes northward and eastward moving intraseasonal disturbances while weak and short lived stratiform heating yields mostly westward propgating synoptic scale low pressure systems. Moreover, the underlying intraseasonal versus low pressure system activity seems to impact the strength and extend of the monsoon trough (MT). In the regime with intraseasonal activity the MT is much stronger and extends northward while in the low pressure system case MT is some what weaker in strength but extends further westward. In the low pressure dominated regime, the background vorticity and zonal wind profiles over the monsoon trough are consistent with the observations. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: MoES, Ministry of Earth Sciences
; ONR, Office of Naval Research
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53443
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Prototype Climate Modelling, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates; Department of Mathematics and Statistics, University of Victoria, STN CSC, P.O. BOX 3045, Victoria, BC, Canada; Department of Mathematics and Center for Atmosphere-Ocean Science, Courant Institute, New York University, 251 Mercer Street, New York, NY, United States
Recommended Citation:
Ajayamohan R.S.,Khouider B.,Majda A.J.,et al. Role of stratiform heating on the organization of convection over the monsoon trough[J]. Climate Dynamics,2016-01-01,47(12)