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Data: way forward

Data: way forward. GO-ESSP meeting next week in Paris Will decide whether our ensemble definitions can become CF-approved ‘standard names’ May give other feedback Need to agree data gridding strategy Need to prioritize variables to be “served” online Need to give APCC some volume estimates.

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Data: way forward

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  1. Data: way forward • GO-ESSP meeting next week in Paris • Will decide whether our ensemble definitions can become CF-approved ‘standard names’ • May give other feedback • Need to agree data gridding strategy • Need to prioritize variables to be “served” online • Need to give APCC some volume estimates

  2. The plan … • Distributed data serving • Should allow easy scaling as more models join • Allows us to get off the ground with limited resources • Reduces political issues / accommodates requirements of funders • Original idea: everyone serve their own data • This is perfectly scalable • BUT we want to allow data producers to do deals with data centres – some regional concentrations of data may be helpful

  3. The plan … • CF compliant netCDF • There was a strong consensus from the scientists to use netCDF (rather than eg GRIB) • The aim is to use CF compliant netCDF • We want to create netCDF files containing multi-model ensemble forecast data – this means we need the concepts of ensemble member number, and also a “multi-model” dimension allowing an adequate characterization of the models concerned. • A prototype implementation has been created, and is presently being used to serve ENSEMBLES seasonal data at ECMWF, via a THREDDS aggregation server. • Note: • The same metadata could be encoded in other ways in the future

  4. The plan … • netCDF structure • Document from Paco Doblas-Reyes outlines the approach taken • Two points to highlight: • “forecast_reference_time” and “forecast_period” are independent time variables, needed to cope with forecasts which overlap in time. • An “ensemble” dimension is used to distinguish the ensemble members, and is used in several auxiliary variables, which between them encode sufficient metadata to identify which integration the data come from. • … (But if you look at Paco’s document in detail, you will be able to judge better than me what are the critical points ….)

  5. Reference • http://www.ecmwf.int/research/EU_projects/ENSEMBLES/data/data_dissemination.html

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