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

该项目将把最先进的大气化学模型(GEOS-Chem)集成到地球系统模型(ESM)中，该模型提供对地球过去、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)与包括哈佛大学和麻省理工学院在内的几个学术机构的合作伙伴关系，旨在扩大国家在气候建模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共同体地球系统模型(CESM)内提供一个成熟的GEOS-Chem模块。使用GEOS-Chem的CESM2配置(CESM2-GC)将通过与大量大气观测和CAM-Chem(即具有化学的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，而且还作为一种通用的改编工具和输入/输出工具。第三个目标是将GEOS-Chem和HEMCO作为大气综合建模系统(SIMA)的一部分，作为通过共同物理框架(CPF)通过共同基础设施链接的可互操作部件的一部分，将GEOS-Chem和HEMCO应用到下一代CESM中。这将涉及在CPF下将GEOS-Chem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，将在每次版本更新时使用全球数据集对标准GEOS-Chem模拟进行基准测试。这些数据包括臭氧和气溶胶物种的表面监测数据、臭氧探空仪、臭氧的卫星观测、气溶胶光学厚度、BROO和其他物种，以及美国宇航局飞机运动对全球相关地区大量物种的垂直轮廓。该项目将培养几名研究生，通过创建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技术人员库，这是社区中强烈认同的需求。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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) 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.