Representation of atmosphere-induced heterogeneity in land–atmosphere interactions in E3SM–MMFv2

IF 4 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geoscientific Model Development Pub Date : 2023-12-18 DOI:10.5194/gmd-16-7275-2023

Jungmin M. Lee, W. Hannah, D. Bader

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引用次数: 0

Abstract

Abstract. In the Energy Exascale Earth System Model (E3SM) Multi-scale Modeling Framework (MMF), where parameterizations of convection and turbulence are replaced by a 2-D cloud-resolving model (CRM), there are multiple options to represent land–atmosphere interactions. Here, we propose three different coupling strategies, namely the (1) coupling of a single land surface model to the global grid (MMF), (2) coupling a single land copy directly to the embedded CRM (SFLX2CRM), and (3) coupling a single copy of land model to each column of the CRM grid (MAML). In the MAML (Multi-Atmosphere Multi-Land) framework, a land model is coupled to CRM at the CRM-grid scale by coupling an individual copy of a land model to each CRM grid. Therefore, we can represent intra-CRM heterogeneity in the land–atmosphere interaction processes. There are 5-year global simulations run using these three coupling strategies, and we find some regional differences but overall small changes with respect to whether a land model is coupled to CRM or a global atmosphere. In MAML, the spatial heterogeneity within CRM induces stronger turbulence, which leads to the changes in soil moisture, surface heat fluxes, and precipitation. However, the differences in the MAML from the other two cases are rather weak, suggesting that the impact of using MAML does not justify the increase in cost.

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在 E3SM-MMFv2 中表示陆地-大气相互作用中大气诱导的异质性

摘要在能源超大规模地球系统模式（E3SM）多尺度建模框架（MMF）中，对流和湍流的参数化被二维云解析模式（CRM）所取代，因此有多种选择来表示陆地与大气的相互作用。在此，我们提出了三种不同的耦合策略，即（1）将单个陆地表面模型耦合到全球网格（MMF），（2）将单个陆地副本直接耦合到嵌入式 CRM（SFLX2CRM），以及（3）将单个陆地模型副本耦合到 CRM 网格的每一列（MAML）。在 MAML（多大气层多陆地）框架中，陆地模型与 CRM 的耦合是在 CRM 网格尺度上进行的，方法是将陆地模型的单个副本耦合到每个 CRM 网格。因此，我们可以表示陆地-大气相互作用过程中的陆地模型内部异质性。使用这三种耦合策略进行了为期 5 年的全球模拟，我们发现了一些区域性差异，但总体上与陆地模式是耦合到 CRM 还是耦合到全球大气层的关系变化不大。在 MAML 中，CRM 内的空间异质性会引起更强的湍流，从而导致土壤水分、地表热通量和降水的变化。然而，MAML 与其他两种情况的差异相当微弱，这表明使用 MAML 的影响并不能证明成本的增加是合理的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geoscientific Model Development GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

8.60

自引率

9.80%

发文量

352

审稿时长

6-12 weeks

期刊介绍： Geoscientific Model Development (GMD) is an international scientific journal dedicated to the publication and public discussion of the description, development, and evaluation of numerical models of the Earth system and its components. The following manuscript types can be considered for peer-reviewed publication: * geoscientific model descriptions, from statistical models to box models to GCMs; * development and technical papers, describing developments such as new parameterizations or technical aspects of running models such as the reproducibility of results; * new methods for assessment of models, including work on developing new metrics for assessing model performance and novel ways of comparing model results with observational data; * papers describing new standard experiments for assessing model performance or novel ways of comparing model results with observational data; * model experiment descriptions, including experimental details and project protocols; * full evaluations of previously published models.