These pages describe the BADC archive of numerical model data from the Hadley Centre coupled model (HadCM3) Control Run. The hadcm3-control run is the 'baseline' model experiment with no climate change effects included (hence the term 'control'). The climate change experiment data are in the 'LINK' dataset.

The current hadcm3-control run dataset covers 100 years (2079 - 2178), and contains all atmospheric and oceanic fields derived from the HadCM3 model. A 1000 year dataset (1849-2849) of model data for selected parameters has also been retrieved from the Met Office and stored at the BADC.

The actual variables available are listed here.

A page showing how the various experiment id's are related is also available here.

17/10/2007 Problems with Storage Unit

We have experienced a sudden problem with the Network Attached Storage (NAS) unit used to store the hadcm3-control dataset. We are currently working to restore the dataset from our backup system, but until this is complete, some data may be unavailable. We apologise for the disruption to the service.

08/10/07 UM Model naming convention.

The Met Office are standardising the way their Unified Model should be referred to:

The Met Office Unified Model is a registered trademark. The Met Office must be acknowledged in any reproduction of data, publication of papers, reports, literature to customers or presentations arising out of the use of the software using: "Met Office Unified ModelTM (UK)".

Full details are given in http://badc.nerc.ac.uk/data/um/UM_Naming_Convention.html.

15/08/07 Please note that we have had a number of problems with some of the data in the 1000 year dataset. As a result, we are attempting to re-extract the data from the Met Office to provide a consistent (and more comprehensive) archive.

Access to HadCM3 Control data at the BADC is open to all academic researchers, the only requirement is that the user completes the online application, which includes acceptance of the Met Office conditions of use form. To apply for access, please follow this link. You will receive a confirmation email when access has been granted.

Please note that access to data is provided on a per person per project basis (i.e. all members on a same project who will be using the data must individually apply for access to the data).

The 100yr and 1000yr datasets are stored as monthly mean binary files. At the moment, these files are in PP format, although utilities are now available from the BADC to access and convert these into several other formats such as NetCDF.

Please Note:

It is possible to extract a just a subset of each PP file (if this is all that is required) if you have an account on login.badc.rl.ac.uk, using the convsh utilility. It is straightforward to set up a simple convsh script to process a PP file and store the output in your home directory. These data may then be ftp'd back to your local machine for analysis. Documentation for convsh is available, as well as some example scripts to illustrate how it should be used.

The files are stored different for the 100y and the 100yr data. For the 100yr, the data are stored in a single pp file for each month which contains all the output variables. The filenames themselves are of the form aaxzka.pmy7sep.pp, where aaxzk refers to the runid, apm is the atmospheric monthly output stream, y7 gives the year, and sep indicates the month.

For the 1000yr data the files are split into one file per variable for each month, with only a limited number of variables being extracted from the Met office (originally as part of the COAPEC project). These files are of the form 000001000000.00.010.000128.1849.12.01.00.00.pp, where 000001000000 is the time period over which the filed is calculated (in this case monthly), 00.010 is the stash code (00010), 000128 is the processing code, which here indicates the mean value over the (monthly) period, and 1849.12.01.00.00 indicates the year, month, day, hour, minute for file. In the case of monthly data, the files are actually associated with the 16th day of each month. Each variables is also stored in a separate directory e.g .../data/1000yr/00010, .../data/1000yr/16222, etc.

The actual variables available are listed here.

General queries about these pages and access to the data should be directed to the BADC support line. Your query should be answered within one working day. When follow-up work is required, the BADC support will carry out the work as quickly and efficiently as possible, and in any case, the user will be kept informed of progress.