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TIGGE LAM Some issues related to interoperability Tiziana Paccagnella ARPA SIM

TIGGE LAM Some issues related to interoperability Tiziana Paccagnella ARPA SIM The Hydro-Meteorological Service of the Regional Environmental Agency of Emilia-Romagna. CONTENT. ICs &BCs (D5) Output of the TIGGE LAM EPS systems (D4)

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TIGGE LAM Some issues related to interoperability Tiziana Paccagnella ARPA SIM

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  1. TIGGE LAM Some issues related to interoperability Tiziana Paccagnella ARPA SIM The Hydro-Meteorological Service of the Regional Environmental Agency of Emilia-Romagna SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  2. CONTENT • ICs &BCs (D5) • Output of theTIGGE LAM EPS systems (D4) • Output Parameters of theTIGGE LAM EPS systems:archiving SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  3. TIGGE LAM & INTEROPERABILITY From the Terms of Reference of the TIGGE LAM Expert Panel: • ……. • The panel should formulate proposals to facilitate the interoperability(different LAMs driven by different GCMs) of the different modelling systems contributing to TIGGE. • The Panel should formulate proposals for the creation of a coordinated distributed archive of limited-area ensemble forecasts. • ……. • The Panel, in a close coordination with the GIFS-TIGGE WG, should propose guidelines as regards LAM EPS validation, calibration and combination. • …… SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  4. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  5. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) With a common format The fields will be produced by the Global Models • on a pre-specified lat-lon horizontal resolution • on pre-defined pressure levels • with pre-defined physical variables Advantages: • it is clear, well-defined, probably not to be changed very frequently. • LAM groups need to modify their pre-processing only once; minor conversions needed only if specific and peculiar variables are required. Drawbacks: • loss in accuracy due to double interpolation The discussion started from these two opposite options: On the GCM “computational grid” Advantages: • Negligible work from the Global Models side • No corruption of the original information (no interpolations) Drawbacks: • A lot of work for the LAM groups Coupler needed SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  6. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) Preliminary proposal (coming out from the meeting held during the ECAM/EMS conefernce 2007) ICs and BCs should be made available: • ICs & BCs for 3 days every 3 hours • on a regular lat/lon grid at the highest reasonable resolution of the Global System • on high density pressure levels (about 50-60; list to be defined) • GRIB 2 format SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  7. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) Preliminary proposal (coming out from the meeting held during the ECAM/EMS conefernce 2007) ICs and BCs should be made available: • ICs & BCs for 3 days every 3 hours • on a regular lat/lon grid at the highest reasonable resolution of the Global System • on high density pressure levels (about 50-60; list to be defined) • GRIB 2 format With some ?????? aspects to be discussed Should the archive contain all the ensemble members ? all the ensemble members and the higher resolution deterministic runs ? some ensemble members and the higher resolution deterministic runs ? SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  8. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) Preliminary proposal (coming out from the meeting held during the ECAM/EMS conefernce 2007) ICs and BCs should be made available: • ICs & BCs for 3 days every 3 hours • on a regular lat/lon grid at the highest reasonable resolution of the Global System • on high density pressure levels (about 50-60; list to be defined) • GRIB 2 format With some ?????? aspects to be discussed Should the archive contain all the ensemble members ? all the ensemble members and the higher resolution deterministic runs ? some ensemble members and the higher resolution deterministic runs ? The proposal is now under further discussion within the Panel: SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  9. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) The proposal is now being revaluated by the Panel: With a common format The fields will be produced by the Global Models • on a pre-specified lat-lon horizontal resolution • on pre-defined pressure levels • with pre-defined physical variables Advantages: • it is clear, well-defined, probably not to be changed very frequently. • LAM groups need to modify their pre-processing only once; minor conversions needed only if specific and peculiar variables are required. Drawbacks: • loss in accuracy due to double interpolation On the GCM “computational grid” Advantages: • Negligible work from the Global Models side • No corruption of the original information (no interpolations) Drawbacks: • A lot of work for the LAM groups On the GCM “computational grid” + TOOLBOX available from the proving centre to interpolate to ??? (one standard format. or, many formats ) Advantages: • The LAM centre can choose Drawbacks: • a not-negligiblework for the GCM providing center Coupler needed Toolboxes needed SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  10. ICs & BCsFrom GCMs to LAMsThe Common Interface (theCoupler/Adaptor) Due to the complexity of the topic….. …….. it has been decided to continue the discussion during this Interoperability workshop !! SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  11. ICs & BCsavailability and archiving SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  12. ICs & BCsavailability and archiving Preliminary proposal (coming out from the meeting held during the ECAM/EMS conefernce 2007) • Temporary archiveof daily “real time” data. • These data should be stored at theproducing centresfor a very short timefrom 3 to 10 daysdepending on the restrictions/possibilities of each producing centre. • Permanent archiveon selected periods (e.g. during specific projects, Forecast Demonstration Projects, Research Demontration Projects, etc.etc.). • These data should be stored at theproducing centres.Another option could be to include these archives in theoverall TIGGE archive centres. • Permanent archivefor Special Cases related to severe events. • As above. These data should be stored at theproducing centres.Another option could be to include these archives in theoverall TIGGE archive centres. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  13. Output Parameters of theTIGGE LAM EPS systems SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  14. Output Parameters of theTIGGE LAM EPS systems • Based on the TIGGE list of archived parameters, a similar list has been compiled for the TIGGE LAM systems • This list is still preliminary. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  15. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  16. Output Parameters of theTIGGE LAM EPS systems:archiving • There is a general consensus about the idea to plan, for the future, a decentralized archiving systems based on Regional Centres. • This should be coordinated at regional level in the THORPEX geography THORPEX regional committees North American (NARC) Co-chairs:  David Parsons, NCAR, USA Pierre Gauthier, MSC, Canada European (ERC) Co-chairs:  George Craig, DLR, Germany Evelyne Richard, France Asian Regional (ARC) Chair: Tetsuo Nakazawa, Japan  Co-chairs:   Chen Dehui, CMA, China Chun-Ho Cho, KMA, Republic of Korea Southern Hemisphere(SHC) Co-chairs:  Kamal Puri, BOM, Australia Neil Gordon, Met Service, New Zealand & some more contacts for South Pacific Arona Ngari, Cook Islands Met Service, Cook Islands Africa South America • This might be harmonized with the Phase 2 of TIGGE SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  17. Output Parameters of theTIGGE LAM EPS systems:archiving Phase A • Some single level parameters have been labelled as HP (High Priority) since they are the easiest to be verified and the most commonly used: • Mean sea level pressure • 10m U-velocity • 10m V-velocity • Wind Gust • Surface air temperature • Surface air dew point temperature • Total precipitation (liquid + frozen) • Convective & large scale • To make the use and exchange of these fields easier, the TIGGE archiving Centres • ECMWF • NCAR • CMA have been requested to archive these HP parameters coming from all the LAM EPS systems. Due to the regional nature of LAMs, the outputs coming from the different systems will be archived in one of the three Centres following a Geographical/Regional competence principle • Output Fields Format • GRIB2 • Lat/Lon grid at 0,1°*0,1° Horizontal Resolution Full resolution fields will be available at the Originating Centres (concept to be refined !!!) • Data policy proposal • The data will be made available within the same rule of TIGGE but with a delay of 24 hours. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  18. Output Parameters of theTIGGE LAM EPS systems:archiving ECMWF, NCAR and CMA have been recently contacted through the TIGGE WG to evaluate the feasibility of the proposal. Philippe Bougeault and Steve Worley already expressed the willingness of ECMWF and NCAR to support TIGGE LAM in this respect. De Hui Chen will communicate the position of CMA as soon as possible. In particular Philippe Bougeault expressed the availability of ECMWF to support this initiative as regards the archiving of European LAMs provided that the volume of data is small compared to the volume of TIGGE global and that the additional work for the archiving centre can be considered minimal. Furthermore, the TIGGE LAM data providers must commit to use the TIGGE formats, and in particular all the metadata. It will be essential that each new EPS system receives an unambiguous name, agreed across all partners, and that name should be part of the GRIB2 files received at the archiving centres. The position expressed by Steve Worley as regards NCAR is in line with the position of ECMWF. NCAR agrees with the same conditions related to the format of the data and they will archive TIGGE LAM data from the Americas and possibly another location or two. They will collect and provide access to the data in files and the possibility to provide user specified subsetting will be assessed at a later time and is not implicitly promised at this moment. They also reserve the right to specify the mode of data delivery from the providers but, anyway, they will make their best to facilitate the work of the other cooperating centres. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  19. Thank you ! SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  20. Tigge LAM Scientific Issues During the meeting we went very quickly through the preliminary list of Scientific Issues to be investigated in the framework of TIGGE-LAM. The list is the following: • How to generate effective perturbations on the Initial Conditions? Connection with data assimilation. • Breeding • EnKF,ETKF • SV •  How to evaluate them on proper test-beds. • Model perturbations generation • Multi-physics • Stochastic physics • Forcing SVs • Hybrid systems: high res deterministic combined with lower res. Ensemble. How to combine them. • Interactions between lateral boundary conditions and growing LAM perturbations∼ Consistent way of perturbing initial and boundary conditions • Optimization of LAM-EPS downscaling (e.g. reduction technique) • Ensemble size • Calibration & Reforecast • Verification • Subjective verification • Objective verification • LAM EPS vs Global EPS • Single EPS vs Multi-EPS • Use of LAM EPS products : downstream applications. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  21. MET OFFICE PROPOSAL TO BECOME RESPONSIBLE MEMBER FOR INTEROPERABILITY PROGRAMME. The original programme proposal identified 6 deliverables, based on consideration of the following NWP systems – Global: Arpege, IFS, UM, GME and 4 LAM model systems: UM, HIRLAM, COSMO, ALADIN: · D1: A report documenting the standard output format and including a list of parameters for which the standard output format is applied. · D2: A report documenting the standard observational data format. · D3: Requirements and Specifications for the adaptor software: This document includes the identification of the methods that can be used for implementing the adaptors, and for maintenance of the software in connection with the consortia. It must be agreed by all groups involved. · D4: Four adaptors that transform the output from every LAM to the standard output format. This includes the software as well as the documentation. · D5: Enhancements to existing software tools, that enable all LAMs to process data from the four available GMs. This includes the software as well as the documentation. -· D6: Enhancements to existing software tools, that enable all LAMs to process data from the other LAMs. This includes the software as well as the documentation. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

  22. D5: Enhancements to existing software tools, that enable all LAMs to process data from the four available GMs. GCMs D6: Enhancements to existing software tools, that enable all LAMs to process data from the other LAMs. LAMs Output Post-Proc. Visual. D4: Four adaptors that transform the output from every LAM to the standard output format. SRNWP Interoperability – ECMWF Reading 14-15 January 2008

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