Deutscher Wetterdienst Status of the Support Activities and WG 6 Activities COSMO Working Group 6: Reference Version and Implementation Working Group Coordinator: Ulrich Schättler

COSMO General Meeting Contents  Support Activities  Status of COSMO-Software  Status of the Web  Model Documentation  Working Group Activities  Grib2 Coding Issues  Source Code Management  SRNWP Interoperability Programme

Deutscher Wetterdienst Status of COSMO Software

COSMO General Meeting Status of COSMO Software  COSMO-Model versions VersionImplementation DateStatus released tested released tested released in VCS (at DWD)

COSMO General Meeting COSMO-Model 4.10 / 4.11 (released)  Dynamics:  Corrected use of cloud ice tendency from Tiedtke scheme in RK  Option for generalized Asselin-Filter  Option for preventing cold pools in steep valleys (ltadv_limiter) in combination with theta advection (itheta_adv=2) only  Option for selecting bottom boundary condition for vertical velocity  Option for reference atmosphere with constant Brunt-Väisälä frequency for idealized cases only

COSMO General Meeting COSMO-Model 4.10 / 4.11 (released)  Physics  New sea-ice scheme  New multi-layer snow model  Changes to TKE-scheme  implicit vertical diffusion; 3D and horizontal correction of windshear production; separate horizontal shear mode; wake turbulence due to SSO; stability corrections for turbulent length scale  Radiation  New optional aerosol climatology  New external parameters for aerosol and surface emissivity  Soil-Model  New optional external parameter for minimum stomata resistance of plants

COSMO General Meeting COSMO-Model 4.12 (tested)  Dynamics  Modifications to bottom boundary condition  Modifications to horizontal diffusion:  Removed the 2D mask field; diffusion factors for interior and boundary zone  Treat diffusion of pressure now separate from temperature  New routines to compute potential vorticity for output  Physics  Modifications to sea-ice scheme and multi-layer snow model  Latent Heat Nudging  Reintroduction of spatial quality function  Generalisation of the use of radar observation input frequency  More robust check in input of radar observations

COSMO General Meeting COSMO-Model 4.13 (released) / 4.14 (in VCS)  4.13 ( )  Technical modifications to prepare for a new source code control system (SVN)  Introduction of an info-module which gives information about the binary, compiler options, etc, for every model run  Reconstruction of the Makefile: put Fopts, ObjFiles, ObjDependencies to separate files and keep extra files for every compiler in new directory LOCAL  4.14 ( )  Microphysics: Take density correction of terminal fall velocity into account. This leads to an increase of sedimentation velocity in the atmosphere

COSMO General Meeting Status of COSMO Software  INT2LM versions VersionImplementation DateStatus released released in VCS (at DWD) in VCS (at DWD)

COSMO General Meeting INT2LM 1.10 (released)  Option lum2lm to process data from the Unified Model (UKMO)  Option to interpolate t_ice and h_ice from GME grid (only)  Option to compute FLake cold start variables  Decomposition independent computation of interpolation weights for reproducibility  Note: There still is a reproducibility problem for the „match“ interpolation of surface / soil variables for isolated land- or sea-points

COSMO General Meeting INT2LM 1.11 / 1.12 (in VCS at DWD)  1.11 ( )  Technical modifications to prepare for a new source code control system (SVN)  Introduction of an info-module which gives information about the binary, compiler options, etc, for every model run  Reconstruction of the Makefile: put Fopts, ObjFiles, ObjDependencies to separate files and keep extra files for every compiler in new directory LOCAL  1.12 ( )  Possibility to switch the reference atmosphere in the option llm2lm  Vectorization of subroutine moist-split

COSMO General Meeting Plans for the Near Future Technical WorkStatus Reconstruction of mpe_ioPrototype available Implementation of ifdefs for external librariesnot started Choice of output format for every Namelist groupnot started Implementation of grib_apistarted for INT2LM New Physics InterfacePrototype for Microphysics Semi-Technical COSMO-ART for Runge-Kuttaunder development 2-moment Microphysicsunder development Generic treatment of idealized casesunder development Implementation of generic tracer variablesneeds coordination Tile / Mosaic approachprototype available; definition of fluxes? Full 3D strang splittingimplemented at MCH; should be discussed in WG2 OASISprototype for OASIS 3.0; new work for 4.0 Urban Moduletechnical difficulties

Deutscher Wetterdienst Status of COSMO Web

Deutscher Wetterdienst The site now provides a news feed for its updates When the traditional “updates log” is changed, subscribers get a notice of the new items

COSMO General Meeting New pages have been created for exchanging observation archives both the browsing and the downloading procedure is web based

COSMO General Meeting People interested for changes in PP taskLists can get informed fast; When a PP page gets edited, a mail is send to the new cosmo-news mailist

COSMO General Meeting The observation-archive browsing/downloading/uploading mechanism was extended to main site. You can browse the site’s directories looking for non-web-page documents, going up and down the folders tree

COSMO General Meeting New forum software installed Possibilities for personal pages, discussions and distributed documentation

COSMO General Meeting Conclusions  Although some contents are still too old, the site has seen some major changes  New features have to be communicated to the Users  We have to see how we can use the browsing/uploading/downloading and the Forum-pages  And (after all): The old contents have to be updated or removed

Deutscher Wetterdienst Model Documentation

COSMO General Meeting Documentation  Model Documentation  Dynamics and Numerics, Physics, Assimilation:  no updates have been done (at least none have been reported)  but: work in progress for Runge-Kutta Documentation  User Guides for INT2LM and the COSMO-Model have been updated to the latest versions in paper form. The web page tool has not been updated.

COSMO General Meeting Documentation  COSMO Newsletter No. 10 has been published in January 2010 with (only) 10 contributions  But we had 6 new Technical Reports: TR  COSMO Priority Project "Further Developments of the Runge-Kutta Time Integration Scheme" (RK); Final Report  COSMO Priority Project "Tackle Deficiencies in Quantitative Precipitation Forecast" (QPF); Final Report  COSMO Priority Project "INTERP"; Final Report  Description of some convective indices, implemented in the COSMO model  Statistical Analysis of high-resolution COSMO Ensemble forecasts, in view of Data Assimilation  Seven years of activity in the field of mesoscale ensemble forecasting by the COSMO-LEPS system: main achievements and open challenges

Deutscher Wetterdienst Other WG 6 Activities  Grib 2 Coding Issues  Source Code Management

COSMO General Meeting Grib2 Coding Issues  Some COSMO centres have now decided to use grib_api from ECMWF as standard Grib library (DWD, MeteoSwiss, ARPA-SIM, …)  grib_api is already implemented into FieldExtra and work is in progress to implement it into INT2LM. Implementation into the COSMO-Model will follow.  Some issues have to be discussed (still ongoing):  Coding the vertical coordinate / grid of the COSMO-Model  What about the Reference Atmosphere  Coordination of usage of Grib2

COSMO General Meeting Coding the Vertical Coordinate  We code all these parameters as „vertical coordinate parameters“ ivctype Type of vertical coordinate (  100: new reference atmosphere): 1: Pressure based hybrid coordinate 2: Height based hybrid coordinate 3: Height based hybrid SLEVE coordinate ke Number of vertical levels p0sl, t0sl, dt0lp, vcflat, Parameters for the (old) reference atmosphere delta_t, h_scal, bv_ref Additional parameters for the (new) reference atmosphere svc1, svc2, nfltvc Parameters for the SLEVE coordinates vcoord(1:ke) Vertical coordinate parameters

COSMO General Meeting Coding the Vertical Coordinate  But only the list of vertical coordinate parameters should be there  Moreover, Grib only knows about „pairs of vertical coordinate parameters“ in combination with the surface pressure:  pressure = a k + b k * surface pressure (typeOfLevel = 119) or  height = a k + b k * surface height (typeOfLevel = 118; new in Grib2)  After the discussion we had in the last months, we proposed a new vertical coordinate type: typeOfLevel = 150  Do not specify vertical coordinate parameters together with a 2D field  but directly specify a 3D field (as a Grib message) with the height of all grid points  The list of vertical coordinate parameters can be used to specify additional information about the vertical grid:  NLAY: number of vertical layers (Note: # levels = # layers + 1)  NGRID: version number of vertical grid

COSMO General Meeting Coding the Vertical Coordinate  But what to do with the parameters for the reference atmospheres?  These parameters do not belong to the vertical grid and they are only necessary to interpret the field „pressure deviation from reference pressure“ (because they are needed to compute the reference pressure)  Using typeOfLevel = 150, we could still code them in the list of vertical coordinate parameters, because this is more or less „local use“ then.  But it is not nice  Are there different possibilities? Section 2, for example?

COSMO General Meeting Source Code Management  COSMO-Standard for Source Code Development  Try to define clear rules for the development (design, coding rules, documentation, etc.)  And also give detailed rules for updating the Reference Version  This has been demanded several times  Now that the community is growing and other communities are also working with the COSMO-Model, this is inevitable  Discussion is going on and we will deliver a „Standard“ until the next COSMO User Seminar

Deutscher Wetterdienst The SRNWP Interoperability Programme

COSMO General Meeting Idea of Interoperability  To support future collaborative effort in European Limited Area Modelling by:  Defining a standard output format  Providing software tools (adaptors) to convert LAM output to the standard format  Enabling European LAMs to run from appropriate alternative model fields  To display or use in NMHS post-processing system  To provide operational backup

COSMO General Meeting GMEIFSUMARPEGE COSMO UM_localALADINHIRLAM Fieldextra Read (Write) Grib 2 and transform to COSMO-Model grid: only 2D fields For Parameter List 1: ps, psml, t2m, td2m, … Plans for the Adaptor

COSMO General Meeting GME ARPEGE COSMO ALADINHIRLAM INT2LM For Parameter List 2: u, v, w, t, p, q x, … Read (Write) Grib 2 and transform to COSMO-Model grid: 2D fields, full atmosphere, soil parameters to be done status unclear GFS? GSM? Plans for the Adaptor

COSMO General Meeting lum2lm (Grib1): Temperature (lowest COSMO Level) from GME IFS UM Aemet UM DWD

COSMO General Meeting lum2lm (Grib1): PP from reference pressure (lowest level) from GME IFS UM Aemet UM DWD

COSMO General Meeting lum2lm (Grib1): Wind speed (lowest level) from GME IFS UM Aemet UM DWD

COSMO General Meeting  In December 2009, the “Interoperability Team” met in Reading for discussing last years work and do some planing for  The first 2 deliverables were finally agreed:  The Standard Format shall be the native grid and native parameters  Documentation supplied with the standard format should be the minimum required  Some Grib 2 Issues were discussed: There is a problem with coding the vertical coordinate / vertical grid of COSMO in Grib 2 (see tomorrows session on Postprocessing) Workshop in Reading

COSMO General Meeting Work in 2010  Vertical coordinate / vertical grid of the COSMO-Model  A COSMO-internal discussion about coding the vertical grid in Grib2 has been initiated early 2010  For the Gal-Chen height based hybrid coordinate it is possible to code the grid with typeOfLevel=118, the corresponding orography (as a 2D field) and vertical coordinate parameters  This is NOT possible for e.g. the SLEVE coordinate  The COSMO discussion led to a proposal to the WMO Commission for Basic Systems (IPET-DRC: Inter-Programme Expert Team on Data Representation and Codes). A new vertical coordinate type is proposed, where no vertical coordinate parameters together with a 2D field are given, but a full 3D field with the heights of every grid point is specified.  The proposal has been discussed also with Enrico Fucile (ECMWF)

COSMO General Meeting Work in 2010  grib_api  grib_api has been established at some COSMO centres to be the official Grib(2) library (DWD, MeteoSwiss, ARPA-SIM Bologna)  Work is in progress to improve performance on NEC machines (together with NEC, MeteoFrance and ECMWF)  It has been implemented in FieldExtra for reading and writing. FieldExtra therefore can now produce the parameters of the standard output format list directly  Work is in progress, to implement it into INT2LM

COSMO General Meeting Work in 2010  New Grib 2 test data set and documentation  A new Grib2 test data set, which has been produced by FieldExtra, has been provided. This still has the old (Grib1-style) coding of the vertical coordinate  No Grib2 test data has been provided with typeOfLevel=118, because this might not be the default case any more (if proposal is accepted)  No surface test data (according to the guidelines from the ET on Surface Aspects) has been provided up to now  The minimum required level documentation has not been updated according to the plans from last workshop  describe native grids  describe fields in the standard output list: what field is it, what does it represent in the generating model

COSMO General Meeting

COSMO General Meeting

COSMO General Meeting Thank you very much for your attention