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Title of Journal: Clim Dyn

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Abbravation: Climate Dynamics

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Springer Berlin Heidelberg

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DOI

10.1016/0300-9629(78)90315-8

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1432-0894

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Role of stratiform heating on the organization of

Authors: R S Ajayamohan Boualem Khouider Andrew J Majda Qiang Deng
Publish Date: 2016/02/25
Volume: 47, Issue: 12, Pages: 3641-3660
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Abstract

It has been recently demonstrated that stratiform heating plays a critical role in the scaleselection of organized tropical convection in an aquaplanet version of a coarseresolution atmospheric general circulation model coupled to a stochastic multicloud cumulus parameterization scheme It is shown that Madden–Julian oscillationlike 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 observationsThe Center for Prototype Climate Modelling CPCM is fully funded by the Abu Dhabi Government through New York University Abu Dhabi NYUAD Research Institute grant This research was initiated during an extended visit of BK and AM to the CPCM at NYUAD during winter 2014 The computations were carried out on the High Performance Computing resources at NYUAD and early tuning of the code were done at the University of Victoria using the West Grid computing Network The research of AM is partially supported by the Office of Naval Research Grant ONR MURI N000141210912 The research of BK is partially funded by Monsoon Mission Project MoES Government of India

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