EH4_OPYC_SRES_B2_SD100

Project: IPCC Third Assessment Report ECHAM4/OPYC data sets
The project embrases the simulations with the coupled climate model ECHAM4/OPYC, relevant for the third assessment report (TAR, http://www.ipcc.ch/ipccreports/assessments-reports.htm) of the Intergovernmental Panel on Climate Change (IPCC).The 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 options for adaption and mitigation.
A more detailed description about the work of the IPCC can be found at the IPCC homepage ( http://www.ipcc.ch ) and at ( www.grida.no/climate/ipcc ). As a further development the Special Report on Emission Scenarios (SRES, http://www.grida.no/Climate/ipcc/emission/) have been constructed, to describe (potential) future developments in the global enviroment with special reference to the production of greenhouse gases and aerosol precursor emissions.
A set of four scenarios families (A1, A2, B1, B2) have been developed (see also http://www.grida.no/climate/ipcc/emission/index.htm ) The model output data are available at the World Data Center for Climate, Hamburg.( wdc-climate.de ). Projection of future trends based on selected emission scenarios are provided through this project for a great many model variables of ECHAM4/OPYC.
For a selected set of variables the IDCC-Data Distribution Center provides additional data sets from a multitude of models that contribute to the IPCC-TAR report (project: IPCC_DDC_TAR).
Summary:
The SRES data sets were published by the IPCC in 2000 and classified
into four different scenario families (A1, A2, B1, B2).
SRES_B2 storyline describes a world in which the emphasis is on
local solutions to economic, social and enviromental sustainability.
The global population is increasing at a lower rate than A2. It has
an intermediate level of economic development and a less rapid and
more diverse technological change than in A1 and B1.
The model consists of the atmospheric component which based on the
weather forecast model of ECMWF. The atmospheric component is the
standard model version of a 19-level hybrid sigma-pressure coordinate
system.
The ocean component is a model which computes with isopycnal coordinates.
This data set is an enlargement of the IPCC data set and provides
additional meteorological parameters.
The run produces 6h values of the variables.
ECHAM4/OPYC3 (http://cera-www.dkrz.de/IPCC_DDC/SRES/ECHAM4/echam4opyc3.html )
Changes af anthropogenic emissions of CO2, CH4, N2O and sulphur
dioxide are prescribed according to the above mentioned scenario.
The model run starts in 1990 from the results of the scenario run
GSDIO (Experiment "EH4OPYC_22723GSDIO") which has been run with
observed conditions for the time period 1860-1990.

项目：IPCC第三次评估报告ECHAM4/OPYC数据集
本项目涵盖耦合气候模式ECHAM4/OPYC的模拟结果，相关内容服务于政府间气候变化专门委员会（Intergovernmental Panel on Climate Change，IPCC）的第三次评估报告（TAR，http://www.ipcc.ch/ipccreports/assessments-reports.htm）。政府间气候变化专门委员会由世界气象组织（World Meteorological Organization，WMO）与联合国环境规划署（United Nations Environment Programme，UNEP）联合设立，旨在评估与气候变化、其潜在影响以及适应与减缓措施相关的科学、技术和社会经济信息。
关于IPCC工作的更详细说明，可访问IPCC官方网站（http://www.ipcc.ch）及（www.grida.no/climate/ipcc）查阅。作为后续研究进展，团队构建了《排放情景特别报告》（Special Report on Emission Scenarios，SRES，http://www.grida.no/Climate/ipcc/emission/），用以描述全球环境的（潜在）未来发展趋势，重点聚焦温室气体与气溶胶前体物的排放情况。
研究人员已开发四类情景族（A1、A2、B1、B2）（详见http://www.grida.no/climate/ipcc/emission/index.htm）。模式输出数据可从汉堡世界气候数据中心（wdc-climate.de）获取。本项目基于选定的排放情景，为ECHAM4/OPYC的众多模式变量提供未来趋势预测结果。
针对选定的变量集合，IPCC数据分发中心（IDCC-Data Distribution Center）还提供了多款参与IPCC-TAR报告的模式的额外数据集（项目：IPCC_DDC_TAR）。
概述：
SRES数据集由IPCC于2000年发布，划分为A1、A2、B1、B2共四类情景族。
SRES_B2情景的叙事框架描述了一个以经济、社会和环境可持续性的本地解决方案为核心的世界。全球人口增速低于A2情景；其经济发展水平处于中等区间，技术变革速度较A1与B1情景更为平缓且形式更为多元。
该模式由两大分量组成：大气分量基于欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts，ECMWF）的天气预报模式，采用19层混合西格玛-气压坐标系的标准版本。
海洋分量采用等密度坐标进行计算。
本数据集为IPCC原始数据集的扩充版本，提供了额外的气象参数。
本次模拟运行输出每6小时的变量值。
ECHAM4/OPYC3（http://cera-www.dkrz.de/IPCC_DDC/SRES/ECHAM4/echam4opyc3.html）
模式中二氧化碳（CO₂）、甲烷（CH₄）、一氧化二氮（N₂O）及二氧化硫的人为排放变化均按照前述情景设定。
本次模拟始于1990年，初始条件取自情景运行GSDIO（实验“EH4OPYC_22723GSDIO”）的结果，该实验以1860-1990年的观测条件为驱动完成模拟。