Coupling of the LM and ECHAMS/MESSy for consistently investigating chemistry and transport from the global to the regional scale

大气中化学过程的数值模拟对于增加我们对大气成分及其由人类活动引起的变化的了解至关重要。近年来，已经开发了计算大气中痕量成分的浓度和处理的全球尺度大气模型。然而，对于诸如当地空气质量、当地污染源的（远距离）迁移和化学测量的详细解释等关键问题，开发高分辨率模型至关重要。为了运行高分辨率的有限区域化学模型，必须始终提供化学变量的适当初始和边界条件。这是第一次，我们建议开发和采用这样一个模型，是由一致的气象和化学领域。这将通过全球ECHAM 5/MESSy系统与本地模型（LM）的耦合来实现。新开发的模型LM/MESSy的第一个应用程序将用于调查其能力（一）详细分析现场测量，（二）直接模拟中尺度化学扰动，如灰尘和生物质燃烧羽流，（三）评估和最终预测当地空气质量。在中期，研究机构联合开发的新工具将用于化学天气预报。

Numerical modelling of chemical processes in the atmosphere is essential to increase our understanding of atmospheric composition and its changes induced by human activity. In recent years, global-scale atmospheric models that calculate the concentration and processing of trace constituents in the atmosphere have been developed. However, for key problems like local air quality, (long-range) transport from local sources and the detailed interpretation of chemical measurements the development of high-resolution models is essential. Proper initial and boundary conditions also for chemical variables must be consistently provided in order to run high-resolution limited-area chemistry models. For the first time, we propose to develop and employ such a model that is driven by consistent meteorological and chemical fields. This will be achieved through coupling of the global ECHAM5/MESSy system with the Local Model (LM). First applications of the newly developed model LM/MESSy will serve to investigate its capabilities for (i) a detailed analysis of field measurements, (ii) the direct simulation of mesoscale chemical perturbations like dust and biomass burning plumes, and (iii) an assessment and eventually forecast of local air quality. On the medium-term, the novel tool, developed jointly within research organisations, will be made available for chemical weather forecasting.