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last modified Dec 03, 2015 03:57 PM
IPCC Data Distribution Centre

Project Description

The DDC has been established to facilitate the timely distribution of a consistent set of up-to-date scenarios of changes in climate and related environmental and socio-economic factors for use in climate impacts assessments. The intention is that these new assessments can feed into the review process of the IPCC.

The initiative to establish a DDC grew out of a recommendation by the IPCC Task Group on Data and Scenario Support for Impact and Climate Analysis (TGICA). This Task Group was itself formed following a recommendation made at the IPCC Workshop on Regional Climate Change Projections for Impact Assessment (London, 24-26 September 1996).

The establishment of the DDC was approved by the IPCC Bureau at its Thirteenth session (9-11 July 1997) and it was subsequently determined at the XIIIth IPCC Plenary (Maldives, 22-28 September 1997) that the DDC would be a shared operation between the Climatic Research Unit (CRU) in the United Kingdom and the Deutsches Klimarechenzentrum (DKRZ) in Germany. In 2003 a third centre, the Center for International Earth Science Information Network (CIESIN) in the USA, joined the DDC collaboration. From February 1st, 2007 British Atmospheric Data Centre (BADC) has replaced CRU as the United Kingdom partner. Each of these institutions has voluntarily taken on responsibility for managing access to a subset of the data and information provided by the DDC.


The conduct of TGICA is governed by its mandate, which can be downloaded here as an Adbobe pdf document. The TGICA has established a set of procedures for managing content on the DDC as described in the DDC Governance document, which can be downloaded here as an Adbobe pdf document.


Related Results

The DDC provides four main types of data and guidance, which meet certain criteria laid down by the TGICA. They are introduced briefly here and described in more detail throughout the web site and accompanying guidelines:

Observed Climate Data Sets

The climate observations comprise 1961-1990 mean monthly data over global land areas for nine variables on a 0.5º latitude/longitude grid, together with decadal anomalies from this mean for the period 1901-1995. This data set is currently being updated to 2000 and interpolated to a finer resolution (10 x 10 arc minutes). Pointers are provided to other relevant global climatologies.

Global Climate Model Data

Global climate model data is available as monthly means or as climatologies. Data is held for climate model projections used as input to the Second, Third and Fourth IPCC Assessment Reports. Full details of the variables held can be found on the relevant data pages. The climatologies aof climate model projections can also be viewed through the DDC visualisation service.

Daily fields are not provided by the DDC, but are available from PCMDI or from the respective modelling centres.


Socio-economic data and scenarios

Socio-economic data and scenarios are required for describing socioeconomic development and adaptation capacity. The reference data include country and regional level indicators of socio-economic and resource variables. The scenario data supplied extend to 2100 and are based on the assumptions underlying the new set of emissions scenarios developed for the IPCC Special Report on Emissions Scenarios, SRES, as well as the six IS92 emissions scenarios prepared by the IPCC in 1992. There is also detailed guidance on the use of DDC data to develop socio-economic and adaptation scenarios as well as links to related guidance material developed by other agencies.


Data and scenarios for other environmental changes

Some data and information for other environmental changes is also included in the site. These include data on global mean CO2 concentration, global and regional sea-level rise, regional ground-level ozone concentration, sulphate aerosol concentration and sulphur deposition. All of these scenarios were developed for the IPCC Third Assessment Report based on the SRES emissions scenarios. Detailed documentation and guidance is also provided for the use of these data.


Most of these information have been collected from DDC´s homepage .They have been last updated on Dec 03, 2015
Filed under: International, Initiative