Availability of data in MARS

WARNING (6/5/2004)

The Met Office data for the coupled model hindcast (GloSea) started in February 1968 were corrupted. The data have been corrected and users are requested to make a new retrieval to substitute their previous files.

WARNING (6/9/2006)

Some of the Met Office data (total precipitation and total soil moisture) for the coupled model hindcast (GloSea) started in November 1992 are corrupted. We are waiting for the data to be corrected, when users will be requested to make a new retrieval to substitute their previous files.

WARNING (10/12/2006)

The Met Office maximum temperature data are the same as the minimum temperature data for all start dates. The data will be corrected soon and a new notice will appear here to request users to make a new retrieval to substitute their previous files.

The hindcasts produced in DEMETER can be retrieved from MARS (a certificate is required for the access). The variable "expver" has been used to distinguish the different partners. The possible values of this variable are:

• 'cnrm' for Météo-France
• 'smpi' for Max-Planck Institute
• 'ukmo' for the Met Office
• 'scwf' for ECMWF
• 'scnr' for INGV
• 'lody' for LODyC
• 'crfc' for CERFACS

This script can be used as example for a typical retrieval. It extracts daily data of low-level wind (variables 165 and 166) and OLR (variable 179) for the dates available for the seven models. Don't hesitate to use the information provided by WebMARS to modify it accordingly with your requirements. Take into account that this script is just an example and that a much more efficient retrieval can be carried out by requesting all the dates of interest at the same time.

Some partners have performed several experiments that are distinguished with the MARS variable "method". Users are strongly advised to retrieved data using the method=1 in their MARS requests. Both the time required for the requests and the load of the system are sensibly reduced. However, if you are interested in accessing data for particular experiments, the value taken by the variable method is described below.

ECMWF

The last two cyphers of the MARS command method indicate the ERA40 experiment used to initialise the model:

• 20: from February 1958 to February 1972
• 334: from May 1972 to August 1972
• 30: from November 1972 until November 1984
• 50: from February 1985 to November 1985
• 40: from February 1986 to November 1988
• 18: from February 1989 onwards.

Then, different numbers are added up to construct the final method:

• 0: for the control run (1958-2001)
• 600: for the control run with 60 levels in the vertical of the atmospheric model, while the control run has 40 levels (1989-2001)
• 2000: for an experiment similar to the control run but using Reynolds OI SST instead of Reynolds 2DVar SST to relax the ocean model during the generation of the initial conditions (1989-1999)
• 3000: for an ocean assimilation experiment with the same assimilation code as system 2 (1989-2001)
• 4000: for a control experiment with a 48-member ensemble (1989-1999).

The official ECMWF version for DEMETER is the control run.

LODyC

The following list applies:

• 30: from February 1974 to May 1985
• 50: from August 1985 to November 1985
• 40: from February 1986 to November 1986
• 12: from February 1987 to August 1988
• 17: for November 1988
• 18: from February 1989 onwards

Météo-France

Method number 11.

MPI

Method number 13 from 1969 to 1986 and 12 afterwards.

INGV

Method number 112.

MetOffice

The number for the coupled experiment is 12 for the monthly means and 11 for the daily data. You add up 200 to obtain the data of the atmospheric model forced with persisted SSTs.

CERFACS

Method number 11.