设计用于模拟稳定边界层的完全可调且通用的 TKE-l 湍流参数化方法

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Advances in Modeling Earth Systems Pub Date : 2024-10-14 DOI:10.1029/2024MS004400
É. Vignon, K. Arjdal, F. Cheruy, M. Coulon-Decorzens, C. Dehondt, T. Dubos, S. Fromang, F. Hourdin, L. Lange, L. Raillard, G. Rivière, R. Roehrig, A. Sima, A. Spiga, P. Tiengou
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引用次数: 0

摘要

本研究介绍了所谓的湍流动能(TKE)-l 或 TKE-l 扩散系数参数化的发展情况,用于在大尺度大气模型中表示中性和稳定条件下的湍流扩散。该参数化经过精心设计,完全可调,即所有可调参数都已明确确定,参数数量也已尽可能减少,以帮助校准和彻底评估参数敏感性。我们选择了一种取决于静态稳定性和风切变的混合长度公式,以涵盖稳定边界层的不同状态。我们采用启发式方法来表达稳定函数和湍流普朗特数,以保证该方案的通用性,并适用于由理想气体和完美气体组成的行星大气,如地球和火星大气。我们特别关注 TKE 方程在大时间步长下的数值稳定性和收敛性,这是在大气环流模型(GCM)中捕捉稳定边界层的基本前提。对弱稳定边界层的单柱理想化模拟进行了测试、参数敏感性评估和初步调整。通过在实验室动力学实验室 Zoom GCM 和火星行星气候模型中的实施,并通过运行南极和火星夜间边界层模拟,评估了该方案的稳健性和多功能性。
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Designing a Fully-Tunable and Versatile TKE-l Turbulence Parameterization for the Simulation of Stable Boundary Layers

This study presents the development of a so-called Turbulent Kinetic Energy (TKE)-l, or TKE-l, parameterization of the diffusion coefficients for the representation of turbulent diffusion in neutral and stable conditions in large-scale atmospheric models. The parameterization has been carefully designed to be completely tunable in the sense that all adjustable parameters have been clearly identified and the number of parameters has been minimized as much as possible to help the calibration and to thoroughly assess the parametric sensitivity. We choose a mixing length formulation that depends on both static stability and wind shear to cover the different regimes of stable boundary layers. We follow a heuristic approach for expressing the stability functions and turbulent Prandlt number in order to guarantee the versatility of the scheme and its applicability for planetary atmospheres composed of an ideal and perfect gas such as that of Earth and Mars. Particular attention has been paid to the numerical stability and convergence of the TKE equation at large time steps, an essential prerequisite for capturing stable boundary layers in General Circulation Models (GCMs). Tests, parametric sensitivity assessments and preliminary tuning are performed on single-column idealized simulations of the weakly stable boundary layer. The robustness and versatility of the scheme are assessed through its implementation in the Laboratoire de Météorologie Dynamique Zoom GCM and the Mars Planetary Climate Model and by running simulations of the Antarctic and Martian nocturnal boundary layers.

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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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