NCAR CESM2 model output prepared for CMIP6 CFMIP amip-future4K

Coupled Model Intercomparison Project Phase 6 (CMIP6) datasets: These data include all datasets published for 'CMIP6.CFMIP.NCAR.CESM2.amip-future4K' with the full Data Reference Syntax following the template 'mip_era.activity_id.institution_id.source_id.experiment_id.member_id.table_id.variable_id.grid_label.version'.

The CESM2 climate model, released in 2018, includes the following components:
aerosol: MAM4 (same grid as atmos), atmos: CAM6 (0.9x1.25 finite volume grid; 288 x 192 longitude/latitude; 32 levels; top level 2.25 mb), atmosChem: MAM4 (same grid as atmos), land: CLM5 (same grid as atmos), landIce: CISM2.1, ocean: POP2 (320x384 longitude/latitude; 60 levels; top grid cell 0-10 m), ocnBgchem: MARBL (same grid as ocean), seaIce: CICE5.1 (same grid as ocean).
The model was run by the National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, 1850 Table Mesa Drive, Boulder, CO 80305, USA (NCAR) in native nominal resolutions: aerosol: 100 km, atmos: 100 km, atmosChem: 100 km, land: 100 km, landIce: 5 km, ocean: 100 km, ocnBgchem: 100 km, seaIce: 100 km.

Project: These data have been generated as part of the internationally-coordinated Coupled Model Intercomparison Project Phase 6 (CMIP6; see also GMD Special Issue: http://www.geosci-model-dev.net/special_issue590.html). The simulation data provides a basis for climate research designed to answer fundamental science questions and serves as resource for authors of the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC-AR6).

CMIP6 is a project coordinated by the Working Group on Coupled Modelling (WGCM) as part of the World Climate Research Programme (WCRP). Phase 6 builds on previous phases executed under the leadership of the Program for Climate Model Diagnosis and Intercomparison (PCMDI) and relies on the Earth System Grid Federation (ESGF) and the Centre for Environmental Data Analysis (CEDA) along with numerous related activities for implementation. The original data is hosted and partially replicated on a federated collection of data nodes, and most of the data relied on by the IPCC is being archived for long-term preservation at the IPCC Data Distribution Centre (IPCC DDC) hosted by the German Climate Computing Center (DKRZ).

The project includes simulations from about 120 global climate models and around 45 institutions and organizations worldwide. - Project website: https://pcmdi.llnl.gov/CMIP6.

耦合模式比较计划第六阶段（Coupled Model Intercomparison Project Phase 6，CMIP6）数据集：本数据集涵盖所有遵循`mip_era.activity_id.institution_id.source_id.experiment_id.member_id.table_id.variable_id.grid_label.version`完整数据引用语法模板，针对`CMIP6.CFMIP.NCAR.CESM2.amip-future4K`发布的全部数据集。

CESM2气候模式于2018年正式发布，其组成模块如下：气溶胶模块采用MAM4方案（与大气模块网格一致），大气模块为CAM6（采用0.9×1.25有限体积网格，经纬度网格分辨率为288×192，共32层，顶层气压为2.25 mb），大气化学模块采用MAM4方案（与大气模块网格一致），陆面模块为CLM5（与大气模块网格一致），陆冰模块为CISM2.1，海洋模块为POP2（经纬度网格分辨率为320×384，共60层，顶层网格单元水深范围0~10 m），海洋生物地球化学模块为MARBL（与海洋模块网格一致），海冰模块为CICE5.1（与海洋模块网格一致）。

该模式由美国国家大气研究中心（National Center for Atmospheric Research，NCAR）气候与全球动力学实验室（地址：美国科罗拉多州博尔德市Table Mesa大道1850号，邮编80305）以原生标称分辨率运行，各模块分辨率分别为：气溶胶模块100 km，大气模块100 km，大气化学模块100 km，陆面模块100 km，陆冰模块5 km，海洋模块100 km，海洋生物地球化学模块100 km，海冰模块100 km。

项目背景：本数据集作为国际协同推进的耦合模式比较计划第六阶段（CMIP6；详见《Geoscientific Model Development（GMD）特刊》：http://www.geosci-model-dev.net/special_issue590.html）的产出成果，其模拟数据为解答核心科学问题的气候研究提供支撑，同时也为政府间气候变化专门委员会（Intergovernmental Panel on Climate Change，IPCC）第六次评估报告（IPCC-AR6）的撰稿人提供了宝贵资源。

CMIP6由世界气候研究计划（World Climate Research Programme，WCRP）下属的耦合模式工作组（Working Group on Coupled Modelling，WGCM）统筹协调。第六阶段继承了此前由气候模式诊断与比较计划（Program for Climate Model Diagnosis and Intercomparison，PCMDI）主导的前期计划成果，其实施依托地球系统网格联合会（Earth System Grid Federation，ESGF）与环境数据分析中心（Centre for Environmental Data Analysis，CEDA）及众多相关协作项目完成。原始数据存储于分布式联邦数据节点集群并进行部分复制，IPCC所依赖的多数数据集将由德国气候计算中心（German Climate Computing Center，DKRZ）托管的IPCC数据分发中心（IPCC Data Distribution Centre，IPCC DDC）进行长期归档保存。

该项目汇聚了全球约120个全球气候模式与近45家科研机构及组织的参与。项目官方网站：https://pcmdi.llnl.gov/CMIP6。