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The dataset contains land-based climate extremes produced through the coordination of the joint WMO CCl/WCRP/JCOMM Expert Team on Climate Change Detection and Indices (ETCCDI). It currently comprises of 29 indices of temperature and precipitation on a 1.25° x 1.875° grid from 1901 to 2018. The indices represent seasonal and/or annual values derived from daily station data. Data are calculated using the Climpact2 software, or have been submitted to the project as pre-calculated indices.
Data have been supplied either as calculated ETCCDI indices or as timeseries of Tmax, Tmin and daily precipitation accumulations for each station. These data have been standardised, and for each index, the stations with sufficient data and coverage selected for inclusion in the dataset. A number of quality control checks are applied to test for reasonable values, for issues in the metadata and for duplicate stations (which may have been submitted via two different input data collections). We use the Angular Distance Weighting gridding method, which combines weighted averages of stations within a decorrelation length scale of a grid box centre. Final output netCDF files are produced, containing the annual, and where appropriate, monthly gridded fields.
We automatically produce a number of plots and diagnostics as part of the creation scripts, and these are also available here. However, as these have been created automatically, not all have been checked and so e.g. colour-scales may not be the most appropriate.
The current version is 3.0.3 (16th December 2020). For full details see the Changelog.
HadEX3 is also available at CEDA Archive (Centres for Environmental Data Analysis): HadEX3 at CEDA.
Note: We have been alerted to the fact that there was an error in the calculation of the GSL index by the Climpact2 code for stations in the Southern Hemisphere. This has been corrected as of their v1.3.0. We will be releasing an update to this index in due course. (27 July 2021)
Keep in touch
Follow us on twitter: @metofficeHadOBS for updates, news and announcements.
For more detailed information, follow our HadEX blog. Here we describe bug fixes, routine updates and other exploratory analysis.
Please get in touch if you have any feedback on the data files or plots.
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