Deutscher Wetterdienst

Consolidation of the software for the generation of External Parameters and

extension with new raw data sets

Hermann Asensio

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Outline

Software for the generation of External Parameters (COLBOC Task 2)

Consolidation and extension of database (COLOBOC Task 3)

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Overall description of the External Parameter System

externalparametersontarget grid

GLOBEorography

DSMWsoil data

GLC2000land use

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Software for the generation of External Parameters (COLBOC Task 2)

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

ksh scriptsFortran programs

global icosahedral grid

GME

ksh scriptsFortran programs

limited area domain

COSMO

current status external parameter generation

new libraryexternal parameter generation

ksh scriptsFortran programs

(Fortran 2003/Fortran 95)

user defined grid

Icon,GMECOSMO

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Software for the generation of External Parameters: technical development Software requirements specifications written new Software Code basis (Fortran 2003 Standard) according to the software

requirement specifications technical documentation with doxygen

(HTML and/or Latex style documentation generated with the help of “tags” from comments in the Fortran source code)

NetCDF as basic file format for Input/Output GRIB output with ECMWF “GRIB_API”

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Version control system and distribution of software (and raw datasets) Webinterface for standard requests for the generation of external parameters

for arbitrary domains (prototype available) update documentation

Software for the generation of External Parameters: open topics

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Consolidation and extension of database (COLOBOC Task 3)

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Additional external parameters

Current external parameter fields for the COSMO model, total 15 fields

planned extensions for the COSMO model, total 30 fields

HH, FR_LAND,SOILTYP, Z0,SSO_STDH, SSO_GAMMA,SSO_THETA, SSO_SIGMA,PLCOV_MN, PLCOV_MX,LAI_MN, LAI_MX,FOREST_D, FOREST_E,ROOTDP

HH, FR_LAND,SOILTYP, Z0,SSO_STDH, SSO_GAMMA,SSO_THETA, SSO_SIGMA,PLCOV_MX,LAI_MX,FOREST_D, FOREST_E,ROOTDP

NDVI, NDVI_MX,NDVI_RATIO, AER_BC,AER_DUST, AER_SO4,AER_SS, T2M_CL, URBAN,RSMIN, EMISS_RAD,FR_LAKE, DEPTH_LK,SLOPE_ASP, SLOPE_ANG,HORIZON, SKYVIEW

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Currently used raw data for external parametersGLOBE

DSMWGLC2000

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

NDVI (SEAWiFS) climatology of near surface temperature (CRU)

Additional raw datasets

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Additional external parametersNormalized Differential Vegetation Index (NDVI)

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

further external parameter fields Fraction Lake FR_LAKE Lake Depth DEPTH_LK

(currently available only for COSMO-EU)

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Consolidation and extension of database: open topics

uncertainties in raw data sets and look-up tables

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Caveats

Problem: The Olympic Winter Games 2014 in Sochi, Russian Federation:

The map The external parameters

Sochi

Most raw data sets provide values (for soiltype etc.)But the land-sea-mask of the GLC2000 data set gives sea water!

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Caveats

The external parameters are only as good as the available raw data sets.

GLC2000 land use classes GLCC USGS land use / land cover system

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

GME ni 256 based on GLCC GME ni 256 based on GLC2000

COSMO-EU based on GLC2000COSMO-DE based on GLC2000

Evergreen Forest:GLC2000 vs. GLCC

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Lookup Tables

DWD routine lookup tableRSMIN

Table a1 RSMIN after Dorman and Sellers (1989)

Table a2 RSMIN after Masson (2003)

Min Rs [s/m]

DWD, current routine settings 150

DWD, settings 1999 - 2007 150 (constant value for all land use classes)

Table a1, Dorman and Sellers (1989) 120

Table a2, Masson (2003) (Ecoclimap) 40

Example: Minimal stomatal resistance (RSMIN) values for land use class “grassland”

mapping of land use classes to external parameters

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Consolidation and extension of database: open topics

smoothing of orography in EXTPAR for parameters for sub-grid scale orography effects (proper scale separation for Z0 / SSO ?)

External parameters for orographic radiation correction consolidate raw datasets:

new global, gridded lake database (Ekaterina Kourzeneva, 2010) Harmonized World Soil Database MODIS data for surface background albedo ETOPO1 or ASTER DEM for orography Globcover for land use data

COSMO General Meeting, Moscow, 2010-09-06, H. Asensio, DWD

Thank you for your attention!