The programme is a suite of scripts in shell script (sh) with ncks/nco and cdo commands, and an R script. The programme downloads and concatenates NCEP reanalysis SLP for the North Atlantic region, then computes the analogues for various distance/metrics (rms, correlations...). It runs on linux or macosX computers. It is more comfortable to have a powerful multicore computer to do the job.

By default, the analogues are computed by minimizing an rms (or Euclidean) distance. 20 "best" analogues are computed for each day between 1st Jan. 1948 and the current day. The analogues are taken from a different year than the "target" day, and are separated by at most 30 calendar days.

The R code can run in parallel on multicore computers (with the "parallel" package). It has been tested on our computing cluster with n=12 processors.

The programme is provided as is. It is free for academic use. Please contact Pascal Yiou for a commercial use.

CECILL

AnaWEGE has been licensed under CECILL.

CECILL is the first license defining the principles of use and dissemination of Free Software in conformance with French law, following the principles of the GNU GPL. This license is meant to be used by companies, research institutions and all organisations willing to release software under a GPL-like license while ensuring a standard level of legal safety.

More information on CECILL can be found here.