气候变化领域集成服务门户(CCPortal): African Easterly Wave Dynamics in Convection-Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model

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DOI	10.1029/2019MS001706
	African Easterly Wave Dynamics in Convection-Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model
	Russell J.O.H.; Aiyyer A.; Dylan White J.
发表日期	2020
ISSN	19422466
卷号	12 期号:1
英文摘要	We examine the upscale effect of moist convection on African easterly waves (AEWs) by limiting condensational heating and initial ambient moisture in convection-permitting simulations. Moist convection is fundamental in maintaining and destabilizing AEWs. The contribution from barotropic-baroclinic instability, albeit important, is relatively smaller. Mesoscale convective systems (MCSs) are initiated downstream of the AEW troughs and are associated with extensive trailing stratiform cloud regions. Using a potential vorticity (PV) budget, we show that the attendant diabatic heating profile reinforces the AEW. A model for destabilization is proposed that relies on the phasing of stratiform heating and the PV anomaly of the AEW. It qualitatively resembles stratiform instability and stretched building blocks hypotheses introduced in previous studies. The generation of PV by deep moist convection in the vicinity of the trough counters the shearing effect of the background flow. This helps maintain an upright PV column, which is conducive for formation of tropical cyclones. AEW propagation is dominated by advective processes and intermittently modified by moist convection when large MCSs move ahead of the AEW. © 2019. The Authors.
英文关键词	African easterly waves; conceptual model; potential vorticity; tropical convection; tropical meteorology; tropical waves
语种	英语
scopus关键词	Budget control; Vorticity; African easterly waves; Conceptual model; Potential vorticity; Tropical convection; Tropical meteorology; Storms; atmospheric convection; atmospheric modeling; easterly wave; heating; meteorology; potential vorticity; simulation; stratiform cloud; tropical cyclone
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156769
作者单位	Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States; Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States
推荐引用方式 GB/T 7714	Russell J.O.H.,Aiyyer A.,Dylan White J.. African Easterly Wave Dynamics in Convection-Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model[J],2020,12(1).
APA	Russell J.O.H.,Aiyyer A.,&Dylan White J..(2020).African Easterly Wave Dynamics in Convection-Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model.Journal of Advances in Modeling Earth Systems,12(1).
MLA	Russell J.O.H.,et al."African Easterly Wave Dynamics in Convection-Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model".Journal of Advances in Modeling Earth Systems 12.1(2020).