ERA5 data is no longer available through the ECMWF Web-API service. Access to ERA5 data is now from the Climate Data Store (CDS) only (interactively through the CDS web interface or programmatically using the CDS API service).
How is the ERA5 daily data organised in MARS?
In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:
- type of data: analysis
- year
- month
- type of level: model level
- dates, times, levels, parameters (all on the same tape file)
- dates, times, levels, parameters (all on the same tape file)
- type of level: potential temperature
- dates, times, levels, parameters (all on the same tape file)
- dates, times, levels, parameters (all on the same tape file)
- type of level: potential vorticity
- dates, times, levels, parameters (all on the same tape file)
- dates, times, levels, parameters (all on the same tape file)
- type of level: pressure level
- dates, times, levels, parameters (all on the same tape file)
- dates, times, levels, parameters (all on the same tape file)
- type of level: surface
- dates, times, parameters (all on the same tape file)
- dates, times, parameters (all on the same tape file)
- type of level: model level
- month
- year
- type of data: forecast
- year
- month
- type of level: model level
- date
- times, levels, parameters (all on the same tape file)
- times, levels, parameters (all on the same tape file)
- date
- type of level: pressure level
- dates, times, steps, levels, parameters (all on the same tape file)
- dates, times, steps, levels, parameters (all on the same tape file)
- type of level: surface
- dates, times, steps, parameters (all on the same tape file)
- dates, times, steps, parameters (all on the same tape file)
- type of level: model level
- month
- year
- type of data: 4D analysis increments
- year
- month
- type of level: model level
- dates, times, steps, levels, parameters (all on the same tape file)
- dates, times, steps, levels, parameters (all on the same tape file)
- type of level: pressure level
- dates, times, steps, levels, parameters (all on the same tape file)
- dates, times, steps, levels, parameters (all on the same tape file)
- type of level: surface
- dates, times, steps, parameters (all on the same tape file)
- dates, times, steps, parameters (all on the same tape file)
- type of level: model level
- month
- year
What would be the natural way to group requests?
The idea is to request as much data as possible from the same tape file . The natural way to group requests would be:
all parameters, all levels, all time-steps for all dates of a month
Note: 'all' means 'all' that the user wants. It doesn't have to be all available parameters.
Useful links