NASA-GISS GISS-E2.1G model output prepared for CMIP6 ISMIP6 1pctCO2-4xext

Coupled Model Intercomparison Project Phase 6 (CMIP6) datasets: These data include all datasets published for 'CMIP6.ISMIP6.NASA-GISS.GISS-E2-1-G.1pctCO2-4xext' 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 GISS-E2.1G climate model, released in 2019, includes the following components:
aerosol: Varies with physics-version (p==1 none, p==3 OMA, p==4 TOMAS, p==5 MATRIX), atmos: GISS-E2.1 (2.5x2 degree; 144 x 90 longitude/latitude; 40 levels; top level 0.1 hPa), atmosChem: Varies with physics-version (p==1 Non-interactive, p>1 GPUCCINI), land: GISS LSM, ocean: GISS Ocean (GO1, 1 degree; 360 x 180 longitude/latitude; 40 levels; top grid cell 0-10 m), seaIce: GISS SI.
The model was run by the Goddard Institute for Space Studies, New York, NY 10025, USA (NASA-GISS) in native nominal resolutions: aerosol: 250 km, atmos: 250 km, atmosChem: 250 km, land: 250 km, ocean: 100 km, seaIce: 250 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.

耦合模型比对项目第六阶段（Coupled Model Intercomparison Project Phase 6，CMIP6）数据集：本数据集包含所有以`CMIP6.ISMIP6（冰盖模式比对项目第六阶段，Ice Sheet Model Intercomparison Project Phase 6）.NASA-GISS（美国国家航空航天局戈达德太空研究所，National Aeronautics and Space Administration Goddard Institute for Space Studies）.GISS-E2-1-G.1pctCO2-4xext`为标识发布的数据集，其完整数据参考语法遵循模板`mip_era.activity_id.institution_id.source_id.experiment_id.member_id.table_id.variable_id.grid_label.version`。

2019年发布的GISS-E2-1-G气候模式包含以下组成部分：
- 气溶胶模块：随物理版本不同而变化（p==1时无气溶胶模块，p==3时采用OMA方案，p==4时采用TOMAS方案，p==5时采用MATRIX方案）；
- 大气模块：GISS-E2.1模式，分辨率为2.5°×2°，经纬度网格为144×90，共40层，顶层气压为0.1百帕；
- 大气化学模块：随物理版本不同而变化（p==1时采用非交互式方案，p>1时采用GPUCCINI方案）；
- 陆面模块：GISS陆面模式（GISS LSM）；
- 海洋模块：GISS海洋模式（GO1），分辨率为1°，经纬度网格为360×180，共40层，顶层网格水深为0~10米；
- 海冰模块：GISS海冰模式（GISS SI）。

该模式由美国纽约州纽约市戈达德太空研究所运行，其原生标称分辨率如下：气溶胶模块250千米，大气模块250千米，大气化学模块250千米，陆面模块250千米，海洋模块100千米，海冰模块250千米。

项目说明：本数据集作为国际协作的耦合模型比对项目第六阶段（Coupled Model Intercomparison Project Phase 6，CMIP6）的一部分生成（详见《地球科学模式发展》特刊：http://www.geosci-model-dev.net/special_issue590.html）。该模拟数据可为解答核心科学问题的气候研究提供支撑，同时作为政府间气候变化专门委员会第六次评估报告（Intergovernmental Panel on Climate Change Sixth Assessment Report，IPCC-AR6）作者的参考资源。

CMIP6由耦合模式工作组（Working Group on Coupled Modelling，WGCM）协调开展，隶属于世界气候研究计划（World Climate Research Programme，WCRP）。第六阶段依托此前在气候模式诊断与比对计划（Program for Climate Model Diagnosis and Intercomparison，PCMDI）主导下完成的前期阶段，其实施依赖地球系统网格联盟（Earth System Grid Federation，ESGF）与环境数据分析中心（Centre for Environmental Data Analysis，CEDA）及众多相关协作活动。原始数据托管于联邦化的数据节点集群并进行部分复制，IPCC依赖的多数数据正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。

该项目涵盖全球约120个全球气候模式的模拟试验，参与单位约45家。项目官网：https://pcmdi.llnl.gov/CMIP6。