A2C2 licenses

AnaWEGE license

AnaWEGE

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.

Analogue software

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.

Circulation Analogue Simulation Tool

CASTf90 (Circulation Analogue Simulation Tool in Fortran90) is a suite of shell script (sh) with ncks/nco and cdo commands, and a fortran90 program. CASTf90 first downloads fields from NCEP reanalysis ("surface" variables or variables on pressure levels, sea level pressure, slp, is the default) and then searches for a given simulation period the most similar cases within a given data base period according to a given distance (default is rms) measure. Finally it writes the N most similar days including the calculated distances for them to an output file.

The fortran program can run in parallel with shared memory using openMP. The purpose is the same as for "Analogue software", but it can do the calculations somewhat faster and comes with some options that allow for more flexibility in terms of time periods, variables and distances. For details see howto.pdf.

The programme is provided as is. It is free for academic use.

Please contact Pascal Yiou for a commercial use.

 

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