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The 1-way on-line coupled atmospheric chemistry model system MECO(n) – Part 2: On-line coupling

机译:单向在线耦合大气化学模型系统MECO(n)–第2部分:在线耦合

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A new, highly flexible model system for the seamless dynamical down-scaling of meteorological and chemical processes from the global to the meso-γ scale is presented. A global model and a cascade of an arbitrary number of limited-area model instances run concurrently in the same parallel environment, in which the coarser grained instances provide the boundary data for the finer grained instances. Thus, disk-space intensive and time consuming intermediate and pre-processing steps are entirely avoided and the time interpolation errors of common off-line nesting approaches are minimised. More specifically, the regional model COSMO of the German Weather Service (DWD) is nested on-line into the atmospheric general circulation model ECHAM5 within the Modular Earth Submodel System (MESSy) framework. ECHAM5 and COSMO have previously been equipped with the MESSy infrastructure, implying that the same process formulations (MESSy submodels) are available for both models. This guarantees the highest degree of achievable consistency, between both, the meteorological and chemical conditions at the domain boundaries of the nested limited-area model, and between the process formulations on all scales. The on-line nesting of the different models is established by a client-server approach with the newly developed Multi-Model-Driver (MMD), an additional component of the MESSy infrastructure. With MMD an arbitrary number of model instances can be run concurrently within the same message passing interface (MPI) environment, the respective coarser model (either global or regional) is the server for the nested finer (regional) client model, i.e., it provides the data required to calculate the initial and boundary fields to the client model. On-line nesting means that the coupled (client-server) models exchange their data via the computer memory, in contrast to the data exchange via files on disk in common off-line nesting approaches. MMD consists of a library (Fortran95 and some parts in C) which is based on the MPI standard and two new MESSy submodels, MMDSERV and MMDCLNT (both Fortran95) for the server and client models, respectively. MMDCLNT contains a further sub-submodel, INT2COSMO, for the interpolation of the coarse grid data provided by the server models (either ECHAM5/MESSy or COSMO/MESSy) to the grid of the respective client model (COSMO/MESSy). INT2COSMO is based on the off-line pre-processing tool INT2LM provided by the DWD. The new achievements allow the setup of model cascades for zooming (down-scaling) from the global scale to the lower edge of the meso-γ scale (≈1 km) with a very high degree of consistency between the different models and between the chemical and meteorological boundary conditions.
机译:提出了一种新的,高度灵活的模型系统,用于将气象和化学过程从全球规模无缝转换为中尺度γ。全局模型和任意数量的有限区域模型实例的级联在同一并行环境中同时运行,其中较粗粒度的实例为较细粒度的实例提供边界数据。因此,完全避免了磁盘空间密集且费时的中间步骤和预处理步骤,并且使常见离线嵌套方法的时间插值误差最小。更具体地说,德国气象局(DWD)的区域模型COSMO在线嵌套在模块化地球子模型系统(MESSy)框架内的大气总循环模型ECHAM5中。 ECHAM5和COSMO之前已经配备了MESSy基础结构,这意味着两个模型都可以使用相同的过程公式(MESSy子模型)。这保证了在嵌套有限区域模型的域边界处的气象条件和化学条件之间以及所有规模的工艺配方之间都可以实现最高程度的一致性。通过使用新开发的MESSy基础架构的附加组件Multi-Model-Driver(MMD)的客户端-服务器方法,可以建立不同模型的在线嵌套。使用MMD,可以在同一消息传递接口(MPI)环境中同时运行任意数量的模型实例,相应的较粗糙模型(全局或区域)是嵌套的较细(区域)客户端模型的服务器,即,它提供了计算客户端模型的初始字段和边界字段所需的数据。在线嵌套是指耦合的(客户端-服务器)模型通过计算机内存交换数据,而在通常的离线嵌套方法中,通过磁盘上的文件进行数据交换。 MMD包括一个基于MPI标准的库(Fortran95和C中的某些部分)以及两个新的MESSy子模型,分别用于服务器和客户端模型的MMDSERV和MMDCLNT(均为Fortran95)。 MMDCLNT包含另一个子子模型INT2COSMO,用于将服务器模型(ECHAM5 / MESSy或COSMO / MESSy)提供的粗略网格数据插值到相应客户端模型(COSMO / MESSy)的网格。 INT2COSMO基于DWD提供的离线预处理工具INT2LM。新的成就允许建立模型级联,以便从全局尺度到中观γ尺度的下边缘(≈1km)进行缩放(缩小),并且不同模型之间和化学物质之间具有非常高的一致性。和气象边界条件。

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