Status of the Support Activities and WG 6 Activities

Deutscher Wetterdienst

Status of the Support Activitiesand WG 6 Activities

COSMO Working Group 6: Reference Version and Implementation

Working Group Coordinator: Ulrich Schättler

06.09.2010 COSMO General Meeting 2010 2

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


Status of COSMO Software



COSMO-Model versions

Version Implementation Date Status

4.9 15.07.09 released

4.10 11.09.09 tested

4.11 27.11.09 released

4.12 13.04.10 tested

4.13 31.05.10 released

4.14 14.06.10 in VCS (at DWD)


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-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-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-Model 4.13 (released) / 4.14 (in VCS)

4.13 (31.05.10)

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 (14.06.10)

Microphysics: Take density correction of terminal fall velocity into account. This leads to an increase of sedimentation velocity in the atmosphere



INT2LM versions

Version Implementation Date Status

1.9 03.03.09 released

1.10 16.12.09 released

1.11 23.04.10 in VCS (at DWD)

1.12 14.06.10 in VCS (at DWD)


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


INT2LM 1.11 / 1.12 (in VCS at DWD)

1.11 (23.04.10)

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 (14.06.10)

Possibility to switch the reference atmosphere in the option llm2lm

Vectorization of subroutine moist-split


Plans for the Near Future

Technical

Work Status

Reconstruction of mpe_io Prototype available

Implementation of ifdefs for external libraries not started

Choice of output format for every Namelist group not started

Implementation of grib_api started for INT2LM

New Physics Interface Prototype for Microphysics

Sem

i-Technical

COSMO-ART for Runge-Kutta under development

2-moment Microphysics under development

Generic treatment of idealized cases under development

Implementation of generic tracer variables needs coordination

Tile / Mosaic approach prototype available; definition of fluxes?

Full 3D strang splitting implemented at MCH; should be discussed in WG2

OASIS prototype for OASIS 3.0; new work for 4.0

Urban Module technical difficulties


Status of COSMO Web


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


New pages have been created for exchanging observation archives

both the browsing

and the downloading procedure is

web based

www.cosmo-model.org/srnwp/content


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


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

www.cosmo-model.org/docView


www.cosmo-model.org/forum

New forum software installed

Possibilities for personal pages, discussions and distributed documentation


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


Model Documentation


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.


Documentation

COSMO Newsletter No. 10 has been published in January 2010 with (only) 10 contributions

But we had 6 new Technical Reports: TR 14 - 19

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


Other WG 6 Activities

Grib 2 Coding Issues



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


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


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 = ak + bk * surface pressure (typeOfLevel = 119) or

height = ak + bk * 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


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-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


The SRNWP Interoperability Programme


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


GME IFSUM ARPEGE

COSMO UM_local ALADIN HIRLAM

Fieldextra

Read (Write) Grib 2and transform to COSMO-Model grid:only 2D fields

For Parameter List 1:ps, psml, t2m, td2m, …

Plans for the Adaptor


GME ARPEGE

COSMO ALADIN HIRLAM

INT2LM

For Parameter List 2:u, v, w, t, p, qx, …

Read (Write) Grib 2and transform to COSMO-Model grid:2D fields, full atmosphere,soil parameters

to be donestatus unclear

GFS?GSM?

Plans for the Adaptor


lum2lm (Grib1): Temperature (lowest COSMO Level) from

GME IFS

UMAemet

UMDWD


lum2lm (Grib1): PP from reference pressure (lowest level) from

GME IFS

UMAemet

UMDWD


lum2lm (Grib1): Wind speed (lowest level) from

GME IFS

UMAemet

UMDWD


In December 2009, the “Interoperability Team” met in Reading for discussing last years work and do some planing for 2010.

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


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)


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


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




Thank you

very much

for your

attention

Documents

Status of the Support Activities and WG 6 Activities