Data available from the DDC

Data used in the AR4 assessment report: four datasets were used in the report to evaluate trends over the past century. These are available either as global and hemispheric aggregates or as low resolution (5 degrees by 5 degrees) spatial fields. High resolution climatology: a high resolution data set prepared by the Climatic Research Unit (CRU). This dataset is not, however, considered to have the same reliability for studies of long term trends as the low resolution CRU dataset which was included in the AR4 assessment (see above). This dataset is available in NetCDF and GeoTIFF (GIS compatible) format. Previous version of CRU data: these data have been superceded by the new versions above, but are preserved in the archive.

Links to other Public-Domain Observed Climate Datasets:

A list of external climatological datasets is also included in the DDC. The list is not comprehensive, and is continually being updated. Moreover, its inclusion implies no judgement about the validity or reliability of the data, nor does it imply that these datasets have been "approved" by the IPCC. Users should make their own evaluation based on the available documentation and provenance of each dataset.

Global Historic Climatology Network (GHCN)

International Research Institute for Climate Prediction/Lamont-Doherty Earth Observation at University of Columbia

NCEP Re-analysis Data

British Atmospheric Data Centre (BADC)

Global Precipitation Climatology Centre (GPCC)

National Centre for Atmospheric Research (NCAR) Data Support System

Climatic Research Unit (CRU) data

World Data Center - A. Meteorology

Climate Diagnostics Centre at NOAA

Comprehensive Ocean-Atmosphere Data Set (COADS) at NOAA

Page last modified: 25 September 2009