Extending the Modular Earth Submodel System (MESSy v2.54) model hierarchy: the ECHAM/MESSy IdeaLized (EMIL) model setup
Extending the Modular Earth Submodel System (MESSy v2.54) model hierarchy: the ECHAM/MESSy IdeaLized (EMIL) model setup
复制标题
扩展模块化地球子模型系统 (MESSy v2.54) 模型层次结构：ECHAM/MESSy IdeaLized (EMIL) 模型设置
DOI：
10.5194/gmd-13-5229-2020
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发表时间：
2020
影响因子：
5.1
通讯作者：
T. Birner
中科院分区：
文献类型：
--
作者：
H. Garny;R. Walz;M. Nützel;T. Birner
抽象的。随着地球系统模型变得越来越复杂，需要通过模型层次结构将它们与简化系统连接起来，以提高过程理解。
模块化地球子模型系统 (MESSy) 的开发目的是将化学过程纳入地球系统模型中。它提供了一个允许不同复杂性的模型配置和设置的环境，到目前为止，层次结构范围从化学盒模型到完全耦合的化学-气候模型。在这里，我们提出了在 MESSy 框架内新实现的干动力核心模型设置，表示为 ECHAM/MESSy IdeaLized (EMIL) 模型设置。
开发 EMIL 的目的是提供一种易于访问的理想化模型设置，该模型设置始终集成在 MESSy 模型层次结构中。 MESSy 中的实施进一步实现了诊断化学示踪剂的利用。该设置是通过实施一个新的子模型来实现的，该子模型用于将温度和水平风松弛到给定的背景值，该子模型取代了 EMIL 设置中的所有其他“物理”子模型。该子模型包含用于为过去经常使用的函数设置所需参数（例如平衡温度、松弛时间和阻尼系数）的选项。本研究由三部分组成。在第一部分中，使用 EMIL 模型设置进行的测试模拟重现了早期干动态岩心研究提供的基准。
在第二部分中，研究了对流层-平流层耦合动力学对设置的各种修改的敏感性。我们发现极涡强度对温带平流层中规定的经向温度梯度的非线性响应，这表明了状态转变。与早期的研究一致，我们发现对流层射流随着极地涡旋强度的增加而向极地移动，但其移动速度很大程度上取决于设置的具体情况。当用对流层中部波状加热代替理想地形来产生行星波时，对流层急流对极地涡旋变化的响应在自由对流层中强烈衰减。然而，在地表附近，喷流以比地形强制模拟更高的速度向极地移动。这些结果表明，在研究对流层-平流层耦合时，可能必须谨慎使用波状加热。
在第三部分中，提出了模型系统可能的应用示例。第一个示例涉及使用简化化学进行模拟，以研究动态变化和理想化变化对示踪剂传输的影响，第二个示例涉及局部加热所强制的理想化季风环流的模拟。在 EMIL 设置中结合被动和化学活性示踪剂的能力证明了未来在理想化动力学模型中研究示踪剂传输的潜力。
Abstract. As models of the Earth system grow in complexity, a need emerges to connect them with simplified systems through model hierarchies in order to improve process understanding.
The Modular Earth Submodel System (MESSy) was developed to incorporate chemical processes into an Earth System model. It provides an environment to allow for model configurations and setups of varying complexity, and as of now the hierarchy ranges from a chemical box model to a fully coupled chemistry–climate model. Here, we present a newly implemented dry dynamical core model setup within the MESSy framework, denoted as ECHAM/MESSy IdeaLized (EMIL) model setup.
EMIL is developed with the aim to provide an easily accessible idealized model setup that is consistently integrated in the MESSy model hierarchy. The implementation in MESSy further enables the utilization of diagnostic chemical tracers. The setup is achieved by the implementation of a new submodel for relaxation of temperature and horizontal winds to given background values, which replaces all other “physics” submodels in the EMIL setup. The submodel incorporates options to set the needed parameters (e.g., equilibrium temperature, relaxation time and damping coefficient) to functions used frequently in the past. This study consists of three parts. In the first part, test simulations with the EMIL model setup are shown to reproduce benchmarks provided by earlier dry dynamical core studies.
In the second part, the sensitivity of the coupled troposphere–stratosphere dynamics to various modifications of the setup is studied. We find a non-linear response of the polar vortex strength to the prescribed meridional temperature gradient in the extratropical stratosphere that is indicative of a regime transition. In agreement with earlier studies, we find that the tropospheric jet moves poleward in response to the increase in the polar vortex strength but at a rate that strongly depends on the specifics of the setup. When replacing the idealized topography to generate planetary waves by mid-tropospheric wave-like heating, the response of the tropospheric jet to changes in the polar vortex is strongly damped in the free troposphere. However, near the surface, the jet shifts poleward at a higher rate than in the topographically forced simulations. Those results indicate that the wave-like heating might have to be used with care when studying troposphere–stratosphere coupling.
In the third part, examples for possible applications of the model system are presented. The first example involves simulations with simplified chemistry to study the impact of dynamical variability and idealized changes on tracer transport, and the second example involves simulations of idealized monsoon circulations forced by localized heating. The ability to incorporate passive and chemically active tracers in the EMIL setup demonstrates the potential for future studies of tracer transport in the idealized dynamical model.
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