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Find links here to efficient retrieval scripts for different S2S datasets via ECMWF Web API.
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Do you provide analysis in S2S?
In principle the S2S database does not contain the initial conditions. However, for some models (e.g ECMWF) step 0 is available (see details below), but only for instantaneous variables.
If you are interested in re-forecasts, most re-forecasts are initialized either from JRA, ERA or NCEP re-analysis which can be available from other public datasets.
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What is the starting step of S2S parameters?
The instantaneous variables are archived from step 0, except for some centres (e.g. NCEP or BoM) who start at step=24 because they don't archive step 0 (step 0 has the same value as the re-analysis). Because of that the data at step 0 and step 24 are different and step=0 corresponds to the initial conditions. For
For accumulated variables (e.g. total Precipitation), step 0 is usually not archived because its value is equal to 0 and step=24 corresponds to the accumulation during the first 24 hours.
For daily averaged variables, there is no step 0.
For MJO RMMS, the calculation for all models starts from step=24 (first common time step for all the models). It uses instantaneous winds at 850 and 200 hPa at step=24h and OLR accumulated over the first 24 hours
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