DDC AR5 Reference snapshot

The DDC AR5 Reference snapshot was collected by the World Data Center Climate (WDCC) at the DKRZ in Germany, the British Atmospheric Data Centre (BADC) in the UK and the Program for Climate Model Diagnosis and Intercomparison (PCMDI) University of California in the US. The DDC AR5 Reference snapshot is based on the status of the CMIP5 data archive as of March 15, 2013.¹ The corresponding IPCC WGI AR5 data snapshot can be found here.

CMIP5 data provided through the IPCC DDC has undergone a quality control procedure. To find individual information on data, data creation and data quality for an experiment, please follow the links in the below tables.

The CMIP5 archive is evolving and in some cases the data used in the IPCC 5th Assessment Report may have been superseded. Latest versions for all experiments are available in the Earth System Grid Federation (ESGF) at https://pcmdi.llnl.gov/mips/cmip5/data-portal.html. For corrections of data sets published under later versions please look at the errata page hosted by PCMDI. Further information on CMIP5 can be found on this page. The data is provided in NetCDF/CF format.

¹ Please note that the full CMIP5 data archive continues to be updated with new results, corrections etc. in contrast to the two archives available from the DDC.

Please note:

A table entry represents a CMIP5 experiment as general citation unit in the literature.
Green experiments have completed the quality control process and are assigned DataCite DOIs (Digital Object Identifiers). The underlying links resolve to the DOI landing pages, which provide basic information related to the data including access.
For grey experiments the data is securely archived in the WDCC and the quality control process is ongoing. The underlying links resolve to web pages displaying basic information related to the data including access.
Red experiments were retracted by the modeling centres and should not be used any more. Please follow the link to the DOI landing page for further details.

For the data download from the IPCC DDC an account (free of charge) is required: Please register at the CERA Portal. How to download data is explained in the data download guide.

Long-term Projections: Centennial and longer Scenarios

Near-term Predictions: Decadal Scenarios

What are the Near-term Predictions?

The near-term decadal prediction experiments are initialized from observed states of the climate system to explore climate predictability and prediction on decadal to multidecadal time scales. In these simulations, the models will not only respond, as in the long-term runs, to climate forcing (e.g., increasing atmospheric CO2 concentration) but also potentially track to some degree the actual trajectory of climate change, including (within the currently unknown predictability limits of the climate system) the unforced component of climate evolution.

Note that decadal predictions with climate models are in an exploratory stage. A number of different methods are being tried to assimilate ocean observations into the models, and no single method has gained widespread acceptance. Moreover, the quality and completeness of ocean observations may be insufficient to realize but a fraction of the predictability inherent in the system. Thus, the forecast systems being assembled for CMIP5 are clearly not considered operational, nor will they necessarily provide more realistic simulations than the long-term simulations.

Taylor, Karl E., Ronald J. Stouffer, Gerald A. Meehl (2012). An Overview of CMIP5 and the Experiment Design. Bull. Amer. Meteor. Soc., 93, 485-498. doi:10.1175/BAMS-D-11-00094.1.

Contact: dataATdkrz.de