气候变化领域集成服务门户(CCPortal): Tropical Cyclogenesis From Self-Aggregated Convection in Numerical Simulations of Rotating Radiative-Convective Equilibrium

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DOI	10.1029/2019MS002020
	Tropical Cyclogenesis From Self-Aggregated Convection in Numerical Simulations of Rotating Radiative-Convective Equilibrium
	Carstens J.D.; Wing A.A.
发表日期	2020
ISSN	19422466
卷号	12 期号:5
英文摘要	In a modeled environment of rotating radiative-convective equilibrium (RCE), convective self-aggregation may take the form of spontaneous tropical cyclogenesis. We investigate the processes leading to tropical cyclogenesis in idealized simulations with a three-dimensional cloud-permitting model configured in rotating RCE, in which the background planetary vorticity is varied across f-plane cases to represent a range of deep tropical and near-equatorial environments. Convection is initialized randomly in an otherwise homogeneous environment, with no background wind, precursor disturbance, or other synoptic-scale forcing. We examine the dynamic and thermodynamic evolution of cyclogenesis in these experiments and compare the physical mechanisms to current theories. All simulations with planetary vorticity corresponding to latitudes from 10°–20° generate intense tropical cyclones, with maximum wind speeds of 80 m s−1 or above. Time to genesis varies widely, even within a five-member ensemble of 20° simulations, indicating large stochastic variability. Shared across the 10°–20° group is the emergence of a midlevel vortex in the days leading to genesis, which has dynamic and thermodynamic implications on its environment that facilitate the spin-up of a low-level vortex. Tropical cyclogenesis is possible in this model at values of Coriolis parameter as low as that representative of 1°. In these experiments, convection self-aggregates into a quasicircular cluster, which then begins to rotate and gradually strengthen into a tropical storm, aided by strong near-surface inflow that is already established days prior. Other experiments at these lower Coriolis parameters instead self-aggregate into a nonrotating elongated band and fail to undergo cyclogenesis over the 100-day simulation. ©2020. The Authors.
英文关键词	convection; idealized modeling; numerical simulation; self-aggregation; tropical cyclogenesis; tropical cyclones
语种	英语
scopus关键词	Aggregates; Hurricanes; Stochastic systems; Storms; Vortex flow; Vorticity; Coriolis parameter; Current theories; Maximum wind speed; Physical mechanism; Radiative-convective equilibrium; Thermodynamic evolution; Tropical cyclogenesis; Tropical cyclone; Tropics
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/156715
作者单位	Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States
推荐引用方式 GB/T 7714	Carstens J.D.,Wing A.A.. Tropical Cyclogenesis From Self-Aggregated Convection in Numerical Simulations of Rotating Radiative-Convective Equilibrium[J],2020,12(5).
APA	Carstens J.D.,&Wing A.A..(2020).Tropical Cyclogenesis From Self-Aggregated Convection in Numerical Simulations of Rotating Radiative-Convective Equilibrium.Journal of Advances in Modeling Earth Systems,12(5).
MLA	Carstens J.D.,et al."Tropical Cyclogenesis From Self-Aggregated Convection in Numerical Simulations of Rotating Radiative-Convective Equilibrium".Journal of Advances in Modeling Earth Systems 12.5(2020).