气候变化领域集成服务门户(CCPortal): Multifluids for Representing Subgrid-Scale Convection

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DOI	10.1029/2019MS001966
	Multifluids for Representing Subgrid-Scale Convection
	Weller H.; McIntyre W.; Shipley D.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	Traditional parameterizations of convection are a large source of error in weather and climate prediction models, and the assumptions behind them become worse as resolution increases. Multifluid modeling is a promising new method of representing subgrid-scale and near-grid-scale convection allowing for net mass transport by convection and nonequilibrium dynamics. The air is partitioned into two or more fluids, which may represent, for example, updrafts and the nonupdraft environment. Each fluid has its own velocity, temperature, and constituents with separate equations of motion. This paper presents two-fluid Boussinesq equations for representing subgrid-scale dry convection with sinking and w = 0 air in Fluid 0 and rising air in Fluid 1. Two vertical slice test cases are developed to tune parameters and to evaluate the two-fluid equations: a buoyant rising bubble and radiative convective equilibrium. These are first simulated at high resolution with a single-fluid model and conditionally averaged based on the sign of the vertical velocity. The test cases are next simulated with the two-fluid model in one column. A model for entrainment and detrainment based on divergence leads to excellent representation of the convective area fraction. Previous multifluid modeling of convection has used the same pressure for both fluids. This is shown to be a bad approximation, and a model for the pressure difference between the fluids based on divergence is presented. © 2020. The Authors.
英文关键词	convection; multifluid; net mass transport; numerical modeling; parameterization
语种	英语
scopus关键词	Climate models; Equations of motion; Predictive analytics; Turbulent flow; Two phase flow; Boussinesq equations; Climate prediction model; Multi-fluid models; Non-equilibrium dynamics; Pressure differences; Radiative-convective equilibrium; Resolution increase; Single fluid model; Air; atmospheric convection; atmospheric transport; Boussinesq equation; climate prediction; error analysis; parameterization; pressure; weather forecasting
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/156664
作者单位	Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Weller H.,McIntyre W.,Shipley D.. Multifluids for Representing Subgrid-Scale Convection[J],2020,12(8).
APA	Weller H.,McIntyre W.,&Shipley D..(2020).Multifluids for Representing Subgrid-Scale Convection.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Weller H.,et al."Multifluids for Representing Subgrid-Scale Convection".Journal of Advances in Modeling Earth Systems 12.8(2020).