TIGGE LAM – some issues related to interoperability aspects Tiziana Paccagnella Interoperability – ECMWF Reading 14-15 January

Tiziana [email protected] SRNWP Interoperability – ECMWF Reading 14-15 January 2008

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Some issues related to interoperability

Tiziana PaccagnellaARPA SIM

The Hydro-Meteorological Service of theRegional Environmental Agency of Emilia-Romagna


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CONTENT

ICs &BCs(D5)

Output of theTIGGE LAM EPS systems (D4)

Output Parameters of theTIGGE LAM EPS systems:archiving


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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.

……


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ICs & BCsFrom GCMs to LAMs

The Common Interface (theCoupler/Adaptor)


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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

Coupler needed

The discussion started from these two opposite options:


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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


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The 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 ?


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The 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:


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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


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


+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

The proposal is now being revaluated by the Panel:


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Due to the complexity of the topic…..

…….. it has been decided to continue the discussion during this Interoperability workshop !!


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ICs & BCsavailability and archiving


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ICs & BCsavailability and archiving

Preliminary proposal (coming out from the meeting held during the ECAM/EMS conefernce 2007)

Temporary archive of daily “real time” data. These data should be stored at the producing centres for a very short

time from 3 to 10 days depending on the restrictions/possibilities of each producing centre.

Permanent archive on selected periods (e.g. during specific projects, Forecast Demonstration Projects, Research Demontration Projects, etc.etc.). These data should be stored at the producing centres. Another option

could be to include these archives in the overall TIGGE archive centres.

Permanent archive for Special Cases related to severe events. As above. These data should be stored at the producing centres.

Another option could be to include these archives in the overall TIGGE archive centres.


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Output Parameters of theTIGGE LAM EPS systems


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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.


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Table 1:TIGGE LAM output parameters: single level

Parameter Level Unit Output frequency

Archiving Priority

Comment

Mean sea level pressure

MSL Pa 3h HP

Surface Pressure surface Pa 3h 10m U-velocity 10m m s-1 3h HP 10m V-velocity 10m m s-1 3h HP U 975 Hpa 3h V 975 Hpa 3h Umax 975 Hpa 3h Vmax 975 Hpa 3h Lifted index 3h Storm Relative Helicity 1-3km m2 s-2 3h

wind gust 10 m 3h HP Maximum in the period (winstorm)

Surface air temperature

1.25 to 2m

K 3h HP

Surface air dew point temperature

1.25 to 2m

K 3h HP

Surface air max temperature

1.25 to 2m K 3h

PBl height m 3h Surface air min temperature

1.25 to 2m K 3h

Total precipitation (liquid + frozen) Convective & large scale

surface m 3h HP

Sea ice 3h Snow fall surface m water

equivalent 3h

Snow depth surface m water equivalent

3h

Sea surface temperature surface K 3h Soil misture top 20cm kg m-3 3h Wilting point top 20cm kg m-3 3h Control run Field capacity top 20cm kg m-3 3h Control run Soil temperature top 20cm K 3h Total cloud cover surface 0-100% 3h instantaneous Height of cloud base 3h Visibility surface m 3h Total column water surface kg m-2 3h inst Surface latent heat flux surface J m-2 3h acc_st Surface sensible heat surface J m-2 3h acc_st


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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 might be harmonized with the Phase 2 of TIGGE

This should be coordinated at regional level in the THORPEX geography THORPEX regional committees

North American (NARC)North American (NARC)Co-chairs: David Parsons, NCAR, USAPierre Gauthier, MSC, CanadaEuropean (ERC)European (ERC)Co-chairs: George Craig, DLR, GermanyEvelyne Richard, FranceAsian Regional (ARC)Asian Regional (ARC)Chair:Tetsuo Nakazawa, Japan Co-chairs: Chen Dehui, CMA, ChinaChun-Ho Cho, KMA, Republic of Korea Southern Hemisphere(SHC)Southern Hemisphere(SHC)Co-chairs: Kamal Puri, BOM, AustraliaNeil Gordon, Met Service, New Zealand

& some more contacts forSouth PacificSouth PacificArona Ngari, Cook Islands Met Service, Cook IslandsAfricaAfricaSouth AmericaSouth America


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archivingPhase 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 ResolutionFull 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.


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archivingECMWF, 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.


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Thank you !


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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.

BreedingEnKF,ETKFSV How to evaluate them on proper test-beds.

Model perturbations generationMulti-physicsStochastic physicsForcing 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 conditionsOptimization of LAM-EPS downscaling (e.g. reduction technique)Ensemble size Calibration & ReforecastVerification

Subjective verificationObjective verificationLAM EPS vs Global EPSSingle EPS vs Multi-EPS

Use of LAM EPS products : downstream applications.


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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.


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GCMs

LAMs

Output Post-Proc.Visual.

D4: Four adaptors that transform the output from every LAM to the standard output format.

D5: Enhancements to existing software tools, that enable all LAMs to process data from the four available GMs.

D6: Enhancements to existing software tools, that enable all LAMs to process data from the other LAMs.

Documents

TIGGE LAM – some issues related to interoperability aspects Tiziana Paccagnella Interoperability – ECMWF Reading 14-15 January