HADCM3_A2b_syns

Project: IPCC Data Distribution Centre : Third Assessment Report data sets
The Intergovernmental Panel on Climate Change (IPCC) has been established by WMO und 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.mad.zmaw.de/IPCC_DDC/html/ddc_gcmdata.html).
This information contained in either IS92 emission scenarios (IPCC 1992), the Special
Report on Emission Scenarios (IPCC 2000, SRES) or published model studies using data from
these scenarios.
Six alternative IPCC scenarios (IS92a to f) were published in the 1992 Supplementary Report
to the IPCC Assessment. These scenarios embodied a wide array of assumption affecting how
future greenhouse gas emissions might evolve in the absence of climate policies beyond
those already adoped.
The SRES scenarios have been constructed to explore future developments
in the global enviromental with special reference to the production of greenhouse gases
and aerosol precursor emission.
A set of four scenario families (A1, A2, B1, B2) have been developed that each of this
storylines describes one possible demographic, polito-economic, societal and technological
future. Model experiments, also using different forcing scenarios, were calculated
at other modeling centres.
Emissions Scenarios. 2000 ,Special Report of the Intergovernmental Panel on Climate Change
Nebojsa Nakicenovic and Rob Swart (Eds.)
Cambridge University Press, UK. pp 570
Summary: The SRES data sets were published by the IPCC in 2000 and classified
into four different scenario families (A1, A2, B1, B2).
SRES_A2 storyline describes a very heterogeneous world
with the underlying theme of self-reliance and preservation
of local identities. It results in this scenario a continous
increasing population together with a slower economic growth
and technological change.
The Hadley Centre Circulation Model is a 3-dim AOGCM described
by (Gordon et al., 2000 and Pope et al., 2000).
The atmospheric component has a 19 levels horizontal resolution,
comparable with spectral resolution of T42, while the ocean
component has a 20 levels resolution.
HADCM3(http://www.meto.gov.uk/research/hadleycentre/models/HadCM3.html )
The changes of anthropogenic emissions of CO2, CH4, N2O and
sulphur dioxide are prescribed according to the above
mentioned scenario.
These data belongs to a set of three ensemble runs, with the
HADCM3-model, using the SRES_A2 scenario. They provide monthly
averaged values of selected variables for the IPCC-DDC.
HadCM3_A2b_syns and HadCM3_SRES_A2c follow the same experimental design
and historical plus future forcings as HadCM3_SRES_A2 (Johns et al.
2003) but starting from initial conditions taken respectively 100 years
and 200 years further into the HadCM3 control simulation.

项目：IPCC数据分发中心：第三次评估报告数据集
政府间气候变化专门委员会（Intergovernmental Panel on Climate Change，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，旨在评估与气候变化理解、其潜在影响以及适应和迁移相关的科学、技术与社会经济信息。
本数据分发中心（Data Distribution Centre，DDC）的该板块提供了若干关键变量的未来趋势预测结果，访问链接为http://www.mad.zmaw.de/IPCC_DDC/html/ddc_gcmdata.html。
此类信息源自IS92排放情景（IPCC，1992年）、《排放情景特别报告（Special Report on Emission Scenarios，SRES）》（IPCC，2000年），或是基于上述情景数据开展的已发表模型研究。
六项可选IPCC情景（IS92a至IS92f）发表于《IPCC评估报告1992年补充报告》。这些情景涵盖了一系列假设，用以描述在已实施气候政策之外无额外气候政策的情况下，未来温室气体排放的演变路径。
SRES情景旨在探究全球环境的未来发展趋势，重点关注温室气体和气溶胶前体物的排放情况。
研究团队构建了四类情景家族（A1、A2、B1、B2），每类情景均对应一种可能的人口、政治经济、社会与技术发展路径。其他建模中心也基于不同的强迫情景开展了模型试验。
《排放情景》，2000年，政府间气候变化专门委员会特别报告，由Nebojsa Nakicenovic与Rob Swart主编，英国剑桥大学出版社出版，共570页。
摘要：SRES数据集由IPCC于2000年发布，共分为四类情景家族（A1、A2、B1、B2）。
SRES_A2情景对应的世界呈现高度异质性，其核心主题为自给自足与本地身份认同的保留。该情景下，人口持续增长，经济增长与技术变革速度相对放缓。
哈德利中心环流模式（Hadley Centre Circulation Model）是一款三维大气海洋耦合模式（Atmosphere-Ocean General Circulation Model，AOGCM），相关说明见Gordon等人（2000年）与Pope等人（2000年）的研究。
该模式的大气分量具备19层垂直分辨率，其水平分辨率与T42光谱分辨率相当；海洋分量则拥有20层垂直分辨率。
HADCM3（访问链接：http://www.meto.gov.uk/research/hadleycentre/models/HadCM3.html）
二氧化碳（CO₂）、甲烷（CH₄）、一氧化二氮（N₂O）以及二氧化硫的人为排放变化均按照前述情景设定。
本数据集为基于HADCM3模式、采用SRES_A2情景开展的三组集合模拟结果，为IPCC数据分发中心提供了选定变量的月均数据。
HadCM3_A2b_syns与HadCM3_SRES_A2c的试验设计、历史与未来强迫情景均与HadCM3_SRES_A2一致（Johns等人，2003年），但二者的初始条件分别取自HADCM3控制模拟中第100年和第200年的状态。