Page History

First you need to understand how the S2S data is organised in MARS.

In general it is organised in MARS , as a huge tree, with the indentation below, showing different levels down that tree:

• centre (ECMWF, NCEP, JMA, ...)
  • realtime or reforecast
    •  type of data (control forecast or perturbed forecast)
      • type of level (single level or pressure level or potential  temperature)
        • dates (2015-01-01 or 2015-01-05 or 2015-01-08, ...)
          •  time-steps
            • members (for perturbed forecast)
              • levels (for pl or pt)
                • parameters

The idea is to be have in the same tape file, all time-steps, all members, all parameters for a type of level, a type, a date