IPCC Working Group I AR5 snapshot: The historical experiment

Project: IPCC Data Distribution Centre : Assessment Report Five data sets - The Intergovernmental Panel on Climate Change (IPCC) has been established by WMO and UNEP to assess scientific, technical and socio-economic information, relevant for the understanding of climate change, its potential impacts and option for adaption and migration. Projection of future trends for a number of key variables are provided through this section of the DDC (http://www.ipcc-data.org/sim/gcm_monthly/AR5/ ). Based on the interests and needs of model developers and data users, global scenarios for two time periods where developed: - near-term scenarios that cover the period to about 2035; and - long-term scenarios that cover the period to 2100 and, in a more stylized way, the period to 2300. Four RCPs (Representative Concentration Pathways: RCP2.6, RCP4.5, RCP6.0 and RCP8.5) were constructed from long-term scenarios available in the published literature. These scenarios include time paths for emissions and concentrations of the full suite of greenhouse gases and aerosols and chemically active gases, as well as land use/land cover. They describe alternative technological, socioeconomic, and policy futures including both reference (without explicit climate policy intervention) and climate policy scenarios. The data represent a subset of data sets from the distributed CMIP5 (Coupled Model Intercomparison Project Phase 5) data archive: http://cmip-pcmdi.llnl.gov/cmip5, which was collected by the ETH Zurich in support of the IPCC WG 1 authors. Data are available in NetCDF/CF format (http://cf-pcmdi.llnl.gov/). Fifth Assessment Report of the IPCC: IPCC, 2013: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Stocker, T.F., D. Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex and P.M. Midgley (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1535 pp, doi:10.1017/CBO9781107415324. Summary: historical 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 IPCC AR5. This subset of the CMIP5 additional historical data were collected by ETH Zurich until 15th March 2013 in support of IPCC AR5 Working Group 1 ( http://wiki.c2sm.ethz.ch/COSMO/CMIP5 ). These data are part of the IPCC-DDC AR5. historical (3.2 Historical) - Version 2: Simulation of recent past (1850 to 2005). Impose changing conditions (consistent with observations). 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 Data are structured and entry names are set according to the ETH Zurich Archive layout: "experiment/MIP table/variable/model/ensemble member/CMOR filename.nc"

项目：政府间气候变化专门委员会（Intergovernmental Panel on Climate Change, IPCC）数据分发中心第五次评估报告数据集

政府间气候变化专门委员会（IPCC）由世界气象组织（World Meteorological Organization, WMO）与联合国环境规划署（United Nations Environment Programme, UNEP）联合成立，旨在评估与理解气候变化、其潜在影响以及适应和迁移方案相关的科学、技术及社会经济信息。本数据分发中心（DDC）的该板块提供了若干关键变量的未来趋势预测（http://www.ipcc-data.org/sim/gcm_monthly/AR5/ ）。

基于模式开发者与数据用户的兴趣与需求，构建了两个时段的全球情景：
- 覆盖至约2035年的近期情景；
- 覆盖至2100年的长期情景，且以更程式化的方式覆盖至2300年。

四个典型浓度路径（Representative Concentration Pathways, RCPs）：RCP2.6、RCP4.5、RCP6.0和RCP8.5，由已发表文献中的长期情景构建而成。这些情景包含了全套温室气体、气溶胶及化学活性气体的排放与浓度时间序列，以及土地利用/土地覆盖数据。它们描述了不同的技术、社会经济与政策未来，包括参考情景（无明确气候政策干预）与气候政策情景。

本数据集为分布式耦合模式比较计划第五阶段（Coupled Model Intercomparison Project Phase 5, CMIP5）数据档案的子集，该档案由苏黎世联邦理工学院（ETH Zurich）收集，以支持IPCC第一工作组的作者团队（http://cmip-pcmdi.llnl.gov/cmip5 ）。数据以NetCDF/CF格式（http://cf-pcmdi.llnl.gov/）提供。

IPCC第五次评估报告：IPCC, 2013: 《气候变化2013：物理科学基础》。第一工作组向政府间气候变化专门委员会第五次评估报告提交的贡献[Stocker, T.F., D. Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex和P.M. Midgley (编)]。剑桥大学出版社，英国剑桥及美国纽约，共1535页，doi:10.1017/CBO9781107415324。

摘要：“historical”为耦合模式比较计划第五阶段（CMIP5）的试验数据集（https://pcmdi.llnl.gov/mips/cmip5 ）。CMIP5旨在为未来五年的协调气候变化试验提供框架，因此包含了用于IPCC第五次评估报告（AR5）评估的模拟结果。该子集的CMIP5额外历史数据由苏黎世联邦理工学院收集至2013年3月15日，以支持IPCC AR5第一工作组的工作（http://wiki.c2sm.ethz.ch/COSMO/CMIP5 ）。这些数据属于IPCC-DDC AR5数据集的一部分。

“historical（3.2 Historical）- 版本2”：模拟1850年至2005年的近期过去气候状态，施加与观测一致的变化强迫条件。试验设计：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、对应模型网格空间分辨率的各变量时间序列。

地球系统模式与模拟信息：CIM知识库

数据按照苏黎世联邦理工学院存档布局进行结构化与命名，格式为："experiment/MIP table/variable/model/ensemble member/CMOR filename.nc"