This study presents the version of the LMDZ global atmospheric model used as the atmospheric component of the Institut Pierre Simon Laplace coupled model (IPSL‐CM6A‐LR) to contribute to the 6th phase of the international Coupled Model Intercomparison Project (CMIP6). This LMDZ6A version includes original convective parameterizations that define the LMDZ “New Physics”: a mass flux parameterization of the organized structures of the convective boundary layer, the “thermal plume model,” and a parameterization of the cold pools created by reevaporation of convective rainfall. The vertical velocity associated with thermal plumes and gust fronts of cold pools are used to control the triggering and intensity of deep convection. Because of several shortcomings, the early version 5B of this New Physics was worse than the previous “Standard Physics” version 5A regarding several classical climate metrics. To overcome these deficiencies, version 6A includes new developments: a stochastic triggering of deep convection, a modification of the thermal plume model that allows the representation of stratocumulus and cumulus clouds in a unified framework, an improved parameterization of very stable boundary layers, and the modification of the gravity waves scheme targeting the quasi‐biennal oscillation in the stratosphere. These improvements to the physical content and a more well‐defined tuning strategy led to major improvements in the LMDZ6A version model climatology. Beyond the presentation of this particular model version and documentation of its climatology, the present paper underlines possible methodological pathways toward model improvement that can be shared across modeling groups.

中文翻译：

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LMDZ6A：IPSL气候模型的大气成分具有改进和更完善的物理特性

这项研究提出了LMDZ全球大气模型的版本，该模型用作Pierre Simon Laplace耦合模型（IPSL-CM6A-LR）的大气成分，为国际耦合模型比较项目（CMIP6）的第六阶段做出了贡献。此LMDZ6A版本包括定义LMDZ“新物理”的原始对流参数化：对流边界层的组织结构的质量通量参数化，“热羽模型”，以及对流降雨再蒸发产生的冷池的参数化。与冷池的热羽和阵风锋相关的垂直速度用于控制深对流的触发和强度。由于一些缺点，就几个经典气候指标而言，该新物理学的早期版本5B比先前的“标准物理学”版本5A差。为了克服这些缺陷，版本6A包括新的发展：随机触发深对流，修改热羽模型以允许在统一框架中表示平流层积云和积云，改进了非常稳定的边界层的参数化以及针对平流层中准双季振荡的重力波方案的修改。物理内容的这些改进和更完善的调整策略导致LMDZ6A版本模型气候的重大改进。除了介绍此特定模型版本及其气候资料之外，