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

该项目将把一个科学水平的大气化学模型（GEOS-Chem）整合到一个地球系统模型（ESM）中，该模型提供了对地球过去、现在和未来气候状态的最先进的计算机模拟。 这项工作是国家大气研究中心（NCAR）和包括哈佛和马萨诸塞州理工学院在内的几个学术机构之间的伙伴关系，旨在扩大国家气候建模和大气化学研究的能力。 该项目的第一个目标是在项目的第一年在共同体地球系统模型（CESM）地球系统模型内提供一个成熟的GEOS-Chem模块。 将通过与大气观测的大型集合和CAM-chem（即具有化学的CESM 2配置）进行比较，对由此产生的具有GEOS-Chem的CESM 2配置（CESM 2-GC）进行评估。 第二个目标是将全球测地系统化学排放工具（HEMCO）作为CESM 2中的一个独立组成部分纳入模型，不仅用于计算排放量，而且还作为一般的再网格和输入/输出工具。 第三个目标是将全球测地系统-化学和HEMCO纳入下一代CESM，作为大气层综合建模系统的一部分，其可互操作的组成部分通过共同物理框架由共同基础设施连接起来。 为了评估模型的总体性能，将在每次版本更新时使用全球数据集对标准的全球地球观测系统化学模拟进行基准测试。这些数据包括臭氧和气溶胶种类的地面监测数据、臭氧探测仪、臭氧、气溶胶光学厚度、溴氧化物和其他种类的卫星观测数据，以及美国航天局飞机在全世界连贯区域对大量物种进行的垂直分布。 该项目将培养几名研究生，通过创建一个新的建模工具来加强国家的研究基础设施，并增加软件工程技术人员的数量，这是社区内强烈认同的需求。该奖项反映了NSF的法定使命，并通过使用基金会的智力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.