ALADIN

Modelling components (under development)

JFM — 2009-07-14T22:33:39Z

ComponentALADINCOSMOHIRLAMUM/JULESECMWF Surface energy balance Patch approach over the nature tile : (up to) 12 different energy and water budgets Flexible tile approach with separate energy budgets Multi Energy Balance in SURFEX/HARMONIE Flexible tile scheme with user defined tiles and elevation bands None Coupling with the atmosphere None None None None None Soil transfers Multi-layer soil scheme (ISBA-DIF) Account for heterogeneous soil properties and organic soils Multi-layer soil (…) - Documentation of SRNWP surface modelling and assimilation systems

Physiography (under development)

JFM — 2009-07-14T21:52:11Z

ComponentALADINCOSMOHIRLAMUM/JULESECMWF Orography GTOPO030 database resolution 30â€ None None None at present, possibly SRTM in future None Soil types FAO database resolution 10 km : fraction of sand and clay Harmonized World Soil Database (HWSD) None HWSD + STATGO + observations None Soil depths ECOCLIMAP database resolution 1km. Lookuptable with ecotypes HWSD None HWSD None Land covers ECOCLIMAP resolution 1km. 255 ecotypes derived from NDVI classification and a set of 12 pure (…) - Documentation of SRNWP surface modelling and assimilation systems

Assimilation and analysis (under development)

JFM — 2009-07-11T22:03:34Z

Model parametersALADINCOSMOHIRLAMUM/JULESECMWF Soil temperature and water content Extended Kalman Filter (EKF) for conventional and satellite observations. Offline mode First guess T2m and Q2m from open land/snow only (excluding forest) Addition of ASCAT data. Longer term plan is to develop an EKF scheme that uses screen observations and satellite data Extended Kalman Filter (EKF) for use of conventional (soil moisture and brightness temperatures). Offline mode Sea surface temperature (…) - Documentation of SRNWP surface modelling and assimilation systems

References and bibliography

JFM — 2009-07-03T12:52:07Z

ALADIN Best, M.J., A. Beljaars, J. Polcher, and P. Viterbo (2004) : A Proposed Structure for Coupling Tiled Surfaces with the Planetary Boundary Layer. J. Hydrometeor., 5, 1271â€“1278, 2004. Boone, A., J.-C. Calvet, and J. Noilhan (1999) : Inclusion of a third soi layer in a land surface scheme using the force-restor method. J. Appl. Meteor., 38, 1611-1630 Boone, A. (2000) : ModÃ©lisation des processus hydrologiques dans le schÃ©ma de surface ISBA : inclusion d'un rÃ©servoir hydrologique, (…) - Documentation of SRNWP surface modelling and assimilation systems

Assimilation and analysis (current status)

JFM — 2009-07-03T12:43:47Z

Model parameters ALADINCOSMOHIRLAM/HARMONIEUM/JULESECMWF Soil temperature and water content Optimum interpolation based on screen-level analysis increments of T and RH 2-dimensional (vertical and temporal) variational technique using 2-m temperature analyses at 12 and 15 UTC Analysed variables : soil moisture of the top 5 soil layers (0-81 cm) at 00 UTC Optimum interpolation based on screen-level analysis increments of T and RH Errors in forecasts of screen T and RH used to calculate (…) - Documentation of SRNWP surface modelling and assimilation systems

Modelling components (current status)

JFM — 2009-07-03T11:55:41Z

modelling component ALADIN COSMO HIRLAM UM/JULES ECMWF surface energy balance Tile approach with separate energy budgets (sea/inland water/nature). One single surface temperature for the "nature" tile (bare soil/vegetation/snow) Surface temperature is area weighted average of temperature of snow covered and snow free surface fraction A tiled scheme with 5 tiles : water (sea+lakes), sea-ice, bare soil, low vegetation and forest (HIRLAM) ; Tile approach with sea/inland (…) - Documentation of SRNWP surface modelling and assimilation systems

Physiography (current status)

JFM — 2009-07-03T11:51:27Z

ComponentALADINCOSMOHIRLAMUM/JULESECMWF Orography GTOPO30 at 30'' resolution GLOBE database NOAA/NGDC resolution 30'' Global 1km data GTOPO30 GLOBE 30'' GTOTPO30 Turbulent orography form drag Soil types FAO at 10 km resolution : fraction of sand and clay FAO Digital Soil Map of the World at resolution 10 km FAO soil database, reduced to 3 classes WHS (UKPP used IGBP) FAO data at 5' by 5' interpolated at the operational model resolution Soil depths ECOCLIMAP database at 1km resolution (…) - Documentation of SRNWP surface modelling and assimilation systems