NWP Test Suite: some updates

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Presentation transcript:

NWP Test Suite: some updates Andrea Montani Arpae Emilia-Romagna Servizio IdroMeteoClima, Bologna, Italy COSMO GM 2018 St Petersburg, 3-6 September 2018

Outline COSMO NWP test suite: how it is now (forecast mode, free_soil) how it is becoming (hindcast mode, free_soil) some open issues

Goals of NWP test suite Build up a software environment to perform carefully-controlled and rigorous testing with calculation of verification statistics for any COSMO model test - version Offer necessary information on the model forecasting performance Provide the COSMO community with standards against which the impacts of new developments in the model should be evaluated. Benchmark to monitor the progress of mesoscale forecast improvement (periodic testing as COSMO evolves).

How it is now (ForecastMode - FreeSoil) We tested the old version of COSMO (e.g v5.03) and the new one (e.g. v5.05) for 2 months (January 2017 and July 2017) at both 7 km (40 ML, fc+72h) and 2.8 km (50 ML, fc+48h), always starting at 00UTC. As for 7km, COSMO_v5.05 was tested in both DoublePrecision and SinglePrecision (only DP @2.8 km). Initial conditions and 3-hourly lateral boundary conditions are provided by ECMWF HRES analysis and forecast fields (no nudging, only straight interpolation): HRES  COSMO@7p0  COSMO@2p8 COSMO@7p0: as for the first day of integration (1 January and 1 July) the soil is interpolated from ICON-EU. For the other days, the soil fields are 24h forecasts of the previous run, properly merged with SST from ECMWF analysis. COSMO@2p8: as for the first day of integration (1 January and 1 July) the soil is interpolated from COSMO@7p0. For the other days, the soil fields are 24h forecasts of the previous run, properly merged with SST from ECMWF analysis. Observations: synop reports from Europe and the Middle East (about 3600 stations x day). Output fields are stored on ECMWF ecfs and provided to Versus and Rfdbk (both installed at ECMWF) for the comparison of the 2 model versions at both resolutions and for the intercomparison of the verification tools.

Present integration domains 7p0 (661x471x40 = 12.453.240 grid points) 2p8 (1587x1147x50 = 91.014.450 grid points)

NWP Test Suite: HindcastMode – FreeSoil We will test the future versions for 2 months (January 2017 and July 2017) at both 7 km (40 ML) and 2.8 km (50 ML), always starting at 00UTC. As for 7km, COSMO will be tested in both DoublePrecision and SinglePrecision (only DP @2.8 km). 6-hourly analyses from ECMWF HRES will provide ICs/BCs for 24h runs at both resolutions. HRES  COSMO@7p0 HRES  COSMO@2p8 was preferred (simpler and faster) to HRES  COSMO@7p0  COSMO@2p8

NWP Test Suite: how it is being implemented COSMO@7p0: as for the first day of integration (1 January and 1 July) the soil is interpolated from ICON-EU and the initial/boundary conditions come from HRES; for the other days, the soil fields are 24h forecasts of the previous run, properly merged with SST from ECMWF analysis and the ICs are taken from the previous integration day (numerically, this is equivalent to a unique one-month run, but no restart needed and no risk of running into troubles with extremely long jobs on ECMWF super-computers). COSMO@2p8: the same. Observations: synop reports from Europe and the Middle East (about 3600 stations x day). Storage: output fields are stored on ECMWF ecfs and provided only to Rfdbk (???) for the comparison of the model versions at both resolutions/precision modes.

Thanks for your attention Open issues Still to quantify properly the costs (anyway HindcastMode cheaper than ForecastMode). What to do with Versus? Move to grib2 production? Transition from COSMO to ICON-LAM: NWP Test Suite still needed? Coordinate with C2I project. HRES provides 6-hourly analyses (~ 10 km), while ERA5 provides 1-hourly analyses (~ 30 km). Think about this? Let the ForecastMode - FreeSoil and HindcastMode - FreeSoil coexist for some model cycles? Thanks for your attention

Extra slides

How it was (ForecastMode - IFS soil) Test the present version of COSMO (e.g v5.01) and the experimental one (e.g. v5.03) for 2 months (January 2013 and July 2013) at both 7 km (40 ML, fc+72h) and 2.8 km (50 ML, fc+48h), always starting at 00UTC. Initial conditions, lower boundary conditions and 3-hourly lateral boundary conditions are provided by ECMWF HRES analysis and forecast fields (no nudging, only straight interpolation ) as follows: HRES  COSMO@7p0 HRES  COSMO@2p8 Observations: synop reports from a domain covering most of Europe and the Middle East (about 3600 stations x day). Output fields are stored on ECMWF ecfs and provided to Versus (also installed at ECMWF) for the comparison of the 2 model versions at both resolutions.

Old domains: NWP METEOROLOGICAL TEST SUITE: integration domain (for both 7 and 2.8 km) ECMWF HRES: ec_nx = 801; ec_ny = 401; 137 ML; ec_dlon = ec_dlat = 0.125 (14 km); fc+72h COSMO@7p0: ie_tot = 745 ; je_tot = 569; 40 ML; dlon = dlat = 0.625 (7 km); fc+72h COSMO@2p8: ie_tot = 1799 ; je_tot = 1369; 50 ML; dlon = dlat = 0.025 (2.8 km); fc+48h