气候变化领域集成服务门户(CCPortal): The Vertical Momentum Budget of Shallow Cumulus Convection: Insights From a Lagrangian Perspective

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DOI	10.1029/2018MS001451
	The Vertical Momentum Budget of Shallow Cumulus Convection: Insights From a Lagrangian Perspective
	Tian Y.; Kuang Z.; Singh M.S.; Nie J.
发表日期	2019
ISSN	19422466
起始页码	113
结束页码	126
卷号	11 期号:1
英文摘要	A Lagrangian Particle Dispersion Model is embedded into large eddy simulations to diagnose the responses of shallow cumulus convection to a small-amplitude large-scale temperature perturbation. The Lagrangian framework allows for a decomposition of the vertical momentum budget and diagnosis of the forces that regulate cloudy updrafts. The results are used to shed light on the parameterization of vertical velocity in convective schemes, where the treatment of the effects of entrainment as well as buoyancy-induced and mechanically induced pressure gradients remains highly uncertain. We show that both buoyancy-induced and mechanically induced pressure gradients are important for the vertical momentum budget of cloudy updrafts, whereas the entrainment dilution term is relatively less important. Based on the analysis of the dominant force balance, we propose a simple model to derive the perturbation pressure gradient forces. We further illustrate that the effective buoyancy and dynamic perturbation pressure can be approximated to a good extent using a simple cylindrical updraft model given the cloud radius. This finding has the potential for improving the parameterization of vertical velocity in convective schemes and the development of a unified scheme for cumulus convection. ©2018. The Authors.
英文关键词	convective schemes; Lagrangian; perturbation pressure; simple model; vertical velocity
语种	英语
scopus关键词	Buoyancy; Clouds; Lagrange multipliers; Large eddy simulation; Momentum; Pressure gradient; Range finding; Velocity; convective schemes; Induced pressure gradient; Lagrangian; Lagrangian particle dispersion model; Shallow cumulus convection; Simple modeling; Temperature perturbations; Vertical velocity; Budget control; atmospheric convection; atmospheric modeling; buoyancy; cumulus; Lagrangian analysis; large eddy simulation; pressure effect; pressure gradient; simulation
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/156996
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; School of Physics, Peking University, Beijing, China
推荐引用方式 GB/T 7714	Tian Y.,Kuang Z.,Singh M.S.,et al. The Vertical Momentum Budget of Shallow Cumulus Convection: Insights From a Lagrangian Perspective[J],2019,11(1).
APA	Tian Y.,Kuang Z.,Singh M.S.,&Nie J..(2019).The Vertical Momentum Budget of Shallow Cumulus Convection: Insights From a Lagrangian Perspective.Journal of Advances in Modeling Earth Systems,11(1).
MLA	Tian Y.,et al."The Vertical Momentum Budget of Shallow Cumulus Convection: Insights From a Lagrangian Perspective".Journal of Advances in Modeling Earth Systems 11.1(2019).