Collaborative Research: Integrating GEOS-Chem Atmospheric Chemistry into the Community Earth System Model (CESM)

该项目将把一个最先进的大气化学模型（GEOS-Chem）整合到一个地球系统模型（ESM）中，该模型提供了地球过去、现在和未来气候状态的最先进的计算机模拟。这项工作是美国国家大气研究中心（NCAR）与包括哈佛大学和麻省理工学院在内的几家学术机构合作开展的，目的是扩大美国在气候模拟和大气化学研究方面的能力。该项目的第一个目标是在项目的第一年在社区地球系统模型（CESM）地球系统模型中提供一个成熟的GEOS-Chem模块。使用GEOS-Chem （CESM2- gc）得到的CESM2配置将通过与大型大气观测集合和CAM-chem（即使用化学的CESM2配置）进行比较来评估。第二个目标是将GEOS-Chem排放工具（HEMCO）作为CESM2的一个独立组件纳入模型，不仅用于计算排放，而且作为一般的重新分类和I/O工具。第三个目标是将GEOS-Chem和HEMCO纳入下一代CESM，作为大气综合建模系统（SIMA）的一部分，并通过公共物理框架（CPF）将可互操作的组件连接在一起。这将涉及GEOS-Chem在CPF下进一步划分为其化学和沉积子组件。为了评估模型的总体性能，将使用全局数据集在每个版本更新时对标准GEOS-Chem模拟进行基准测试。这些数据包括臭氧和气溶胶种类的地面监测数据、臭氧探空仪、臭氧、气溶胶光学深度、BrO和其他种类的卫星观测数据，以及美国国家航空航天局（NASA）飞机在全球相关地区对大量种类进行的垂直剖面。该项目将培养几名研究生，通过创建一种新的建模工具来增强国家的研究基础设施，并增加软件工程方面的人才储备，这是社区内强烈认同的需求。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project will integrate a state-of-science atmospheric chemistry model (GEOS-Chem) into an Earth System Model (ESM) that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states. This effort is a partnership between the National Center for Atmospheric Research (NCAR) and several academic institutions, including Harvard and the Massachusetts Institute of Technology, to expand the national capabilities for climate modeling and atmospheric chemistry research. The first objective of the project is to deliver a mature GEOS-Chem module within the Community Earth System Model (CESM) Earth System Model in the first year of the project. The resulting CESM2 configuration with GEOS-Chem (CESM2-GC) will be evaluated by comparison to a large ensemble of atmospheric observations and to CAM-chem, that is the CESM2 configuration with chemistry. The second objective is to incorporate the GEOS-Chem emissions tool (HEMCO) into the model as an independent component in CESM2, not only for computing emissions but also as a general regridding and as an I/O tool. The third objective is to implement GEOS-Chem and HEMCO into the future-generation CESM as part of the System for Integrated Modeling of the Atmosphere (SIMA) with interoperable components linked by common infrastructure through the Common Physics Framework (CPF). This will involve further partitioning of GEOS-Chem into its chemistry and deposition subcomponents under the CPF.To assess the general performance of the model, global datasets will be used to benchmark the standard GEOS-Chem simulations at each version update. These include surface monitoring data for ozone and aerosol species, ozonesondes, satellite observations of ozone, aerosol optical depth, BrO, and other species, and vertical profiles from NASA aircraft campaigns for a large ensemble of species in coherent regions worldwide. The project will train several graduate students, enhance the nation's infrastructure for research by creating a new modeling tool, and increase the pool of personnel skilled in software engineering, a need strongly identified within the community.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.