IPSL-CM5A-MR model output prepared for CMIP5 abrupt4xCO2 experiment, served by ESGF

Project: IPCC Assessment Report 5 and Coupled Model Intercomparison Project data sets - These data belong to two projects: 1) to the Assessment Report No 5 of the International Panel on Climate Change (IPCC-AR5) and 2) to the Coupled Model Intercomparison Project No 5 (CMIP5). CMIP5 is executed by the Program for Climate Model Diagnosis and Intercomparison (PCMDI) on behalf of the World Climate Research Programme (WCRP). Most of the data is replicated between the three data nodes at the World Data Centre for Climate (WDCC), the British Atmospheric Data Centre (BADC), and the PCMDI. The project embraces the simulations with about 30 climate models of about 20 institutes worldwide. Summary: 'abrupt4xco2' is an experiment of the CMIP5 - Coupled Model Intercomparison Project Phase 5 (https://pcmdi.llnl.gov/mips/cmip5). CMIP5 is meant to provide a framework for coordinated climate change experiments for the next five years and thus includes simulations for assessment in the AR5 as well as others that extend beyond the AR5. 6.3 abrupt4xco2 (6.3 Abrupt 4XCO2) - Version 1: Impose an instantaneous quadrupling of CO2, then hold fixed. Experiment design: https://pcmdi.llnl.gov/mips/cmip5/experiment_design.html List of output variables: https://pcmdi.llnl.gov/mips/cmip5/datadescription.html Output: time series per variable in model grid spatial resolution in netCDF format Earth System model and the simulation information: CIM repository Entry name/title of data are specified according to the Data Reference Syntax (https://pcmdi.llnl.gov/mips/cmip5/docs/cmip5_data_reference_syntax.pdf) as activity/product/institute/model/experiment/frequency/modeling realm/MIP table/ensemble member/version number/variable name/CMOR filename.nc.

项目：IPCC第五次评估报告与耦合模式比较计划数据集——本数据集隶属于两大项目：1）国际气候变化专门委员会（Intergovernmental Panel on Climate Change, IPCC）第五次评估报告（IPCC-AR5）；2）第五次耦合模式比较计划（Coupled Model Intercomparison Project Phase 5, CMIP5）。第五次耦合模式比较计划由气候模式诊断与比较计划小组（Program for Climate Model Diagnosis and Intercomparison, PCMDI）代表世界气候研究计划（World Climate Research Programme, WCRP）牵头实施。世界气候数据中心（World Data Centre for Climate, WDCC）、英国大气数据中心（British Atmospheric Data Centre, BADC）与PCMDI的三个数据节点间已完成绝大多数数据的副本同步。本项目涵盖全球约20家科研机构的近30个气候模式所开展的模拟试验。

摘要：“abrupt4xco2”是第五次耦合模式比较计划（CMIP5）下的一项试验（详见https://pcmdi.llnl.gov/mips/cmip5）。CMIP5旨在为未来五年的协同气候变化试验提供框架，其既包含服务于IPCC第五次评估报告的模拟试验，也涵盖超出该评估报告范畴的其他模拟试验。

6.3 abrupt4xco2（6.3 突变4倍CO₂）——版本1：对CO₂浓度实施瞬时四倍强迫，随后维持该浓度恒定。试验设计说明：https://pcmdi.llnl.gov/mips/cmip5/experiment_design.html
输出变量列表：https://pcmdi.llnl.gov/mips/cmip5/datadescription.html
输出结果：以netCDF格式存储的、各变量对应的时间序列数据，空间分辨率与对应模式网格保持一致。

地球系统模式及模拟信息：数据的条目名称与标题需遵循公共信息模型（Common Information Model, CIM）仓库的数据引用语法（Data Reference Syntax, DRS）规范，具体命名格式为：activity/product/institute/model/experiment/frequency/modeling realm/MIP table/ensemble member/version number/variable name/CMOR filename.nc，详细规范参见https://pcmdi.llnl.gov/mips/cmip5/docs/cmip5_data_reference_syntax.pdf。