Modeling for Forecasting and Analysis of Megacity Impacts on Regional and Global Environments-Mexico City Pollution Outflow Field Campaign (MIRAGE-Mex)

该奖项将为“大城市对区域和全球环境的影响--墨西哥城污染外流”实地活动提供气象支持，以支持活动的规划和执行。MIRAGE-MEX活动的目的是提高我们对墨西哥城大都市区污染羽流影响的了解，研究城市-区域-全球过渡中的气相反应性，分析气溶胶的物理和化学演化及其辐射特性，并研究气体-气溶胶相互作用。该项目将通过预测羽流的演变和分析实验期间的气象条件，为实现这些目标做出贡献。该项目将使用MM5(第五代中尺度模式)、CAMX和FLEXPART模式。具体任务将包括：分析墨西哥城盆地的烟羽扩散情况；调查停留时间、混合过程、坡面流动和城市热岛流，以确定分析区域出口和全球运输所需的初始条件；开发用于评估弱风流和多变风流条件的先进方法；改进陆面模型的投入。此外，还将开发基于粒子轨迹的来源识别方法。该项目将为研究生和博士后研究人员提供教育机会，并为实地项目提供核心内容，该项目旨在研究大气成分与气候之间的相互作用，特别是在受大城市排放影响的条件下，这一非常重要的主题。

This award will provide funding for meteorological support for the Megacity Impacts on Regional and Global Environments-Mexico City Pollution Outflow (MIRAGE-Mex) field campaign to support campaign planning and execution. The objective of the MIRAGE-Mex campaign is to improve our understanding of the impacts of the Mexico City Metropolitan Area pollution plume, to study the gas phase reactivity in the urban-regional-global transition, analyze the physical and chemical evolution of aerosols and their radiative properties, and study gas-aerosol interactions. This project will contribute towards these goals by forecasting the evolution of the plume and to analyze the meteorological conditions during the experiment. The project will use MM5 (Fifth-Generation Mesoscale Model), CAMx, and FLEXPART models. Specific tasks will include: Analysis of plume dispersion from the Mexico City basin; investigation of residence times, mixing processes, slope flows and urban heat island flow to determine the initial conditions necessary for analyzing regional export and global transport; development of advanced methods for model evaluation for conditions of weak and variable wind flow, the development of improved inputs for the meteorological Land Surface Model. In addition, methods will be developed for source identification based on particle trajectories.This project will provide educational opportunities for a graduate student and a post-doctoral researcher, and provide a central element for a field program aimed at a very important topic regarding the interactions between atmospheric composition, in particular under conditions influenced by megacity emissions, and climate.