ICON-DREAM: ICON-Dual resolution Reanalysis for Emulators, Applications and Monitoring
DOI for Scientific and Technical Data
10.5676/dwd/icon-dream_v1
Title
ICON-DREAM: ICON-Dual resolution Reanalysis for Emulators, Applications and Monitoring
Subtitle
The ICON-Dual resolution reanalysis
Citation
Valmassoi, Arianna; Anlauf, Harald; Becker, Andreas; Keller, Jan D.; Krebber, Sibylle; Zängl, Günther; Potthast, Roland; Cress, Alexander; Fundel, Felix; Hanisch, Thomas; Lange, Martin; Steinert, Thorsten; Kaspar, Frank, "ICON-DREAM: ICON-Dual resolution Reanalysis for Emulators, Applications and Monitoring The ICON-Dual resolution reanalysis version v1.0." Deutscher Wetterdienst, 2025, doi:10.5676/dwd/icon-dream_v1.Creators
Valmassoi, Arianna (Deutscher Wetterdienst); Anlauf, Harald (Deutscher Wetterdienst); Becker, Andreas (Deutscher Wetterdienst); Keller, Jan D. (Deutscher Wetterdienst); Krebber, Sibylle (Deutscher Wetterdienst); Zängl, Günther (Deutscher Wetterdienst); Potthast, Roland (Deutscher Wetterdienst); Cress, Alexander (Deutscher Wetterdienst); Fundel, Felix (Deutscher Wetterdienst); Hanisch, Thomas (Deutscher Wetterdienst); Lange, Martin (Deutscher Wetterdienst); Steinert, Thorsten (Deutscher Wetterdienst); Kaspar, Frank (Deutscher Wetterdienst)Acknowledgement
Publication Date
2025
Version
v1.0
Publisher
Deutscher Wetterdienst
Summary
With ICON-DREAM, Germany's national meteorological service DWD (Deutscher Wetterdienst) started a new generation of reanalyses after the COSMO-R6G2, based on DWD's global and European forecasting system.
The reanalysis uses the ICOsahedral Nonhydrostatic (ICON) modelling framework (based on the operational system from March 2024), with a resolution of 13 km globally and a nested Europe domain with a resolution of 6.5 km.
The data assimilation cycle comprises an EnVar scheme at 3-hourly intervals complemented by a snow analysis every 3 hours, and soil moisture analysis every 24 hours (at 00 UTC), and the sea surface temperature is initialized using the daily 1/20° OSTIA product.
All observations used in the first version of ICON-DREAM come from the ones originally archived by DWD for the purpose of its operational numerical weather prediction.
Flow-dependent background error covariances are provided by a 20-member ensemble at 40km global and 20km over Europe, which uses an LETKF-based ensemble data assimilation scheme.
Version 1 of ICON-DREAM covers the period from 2010 onward, and provides hourly outputs for 111 variables, of which 3 are for the 8 soil depths, 15 are on the native model levels (120 for the global, and 74 for the European nest), and 13 on the 37 standard pressure levels.
The reanalysis uses the ICOsahedral Nonhydrostatic (ICON) modelling framework (based on the operational system from March 2024), with a resolution of 13 km globally and a nested Europe domain with a resolution of 6.5 km.
The data assimilation cycle comprises an EnVar scheme at 3-hourly intervals complemented by a snow analysis every 3 hours, and soil moisture analysis every 24 hours (at 00 UTC), and the sea surface temperature is initialized using the daily 1/20° OSTIA product.
All observations used in the first version of ICON-DREAM come from the ones originally archived by DWD for the purpose of its operational numerical weather prediction.
Flow-dependent background error covariances are provided by a 20-member ensemble at 40km global and 20km over Europe, which uses an LETKF-based ensemble data assimilation scheme.
Version 1 of ICON-DREAM covers the period from 2010 onward, and provides hourly outputs for 111 variables, of which 3 are for the 8 soil depths, 15 are on the native model levels (120 for the global, and 74 for the European nest), and 13 on the 37 standard pressure levels.
Spatial Coverage
Global
Temporal Coverage
from: 2010-01-01 until:Resource Type
dataset
Resource Format
GRIB (General Regularly-distributed Information in Binary form)
Resource Size
Resource Access
| Download | Format | Info |
|---|---|---|
| ICON-DREAM-Global | opendata | The data on the DWD Opendata server is organised by region, temporal resolution and parameter. The parameter folders contain the GRIB files with the monthly stored data. The parameter and the spatial and temporal resolution are included in the file name. For example, the file name for the daily mean temperature at a height of 2 m on the global grid for January 2011 is: ICON-DREAM-Global_201101_T_2M_dayavg.grb |
| ICON-DREAM-EU | opendata | The data on the DWD Opendata server is organised by region, time resolution and parameter. The parameter folders contain the GRIB files with the monthly stored data. The parameter and the spatial and temporal resolution are included in the file name. For example, the file name for the daily average temperature at a height of 2 m on the EU grid for January 2011 is: ICON-DREAM-EU_201101_T_2M_dayavg.grb |
Supplemental Information
| Globales R03B07-Gitter |
|---|
| Global R03B07 grid. 13 km resolution. Grid rotated by 36 degrees around z-axis. |
| Regionales R03B08-Gitter (Europa) |
| Regional R03B08 grid (Europe). 6.5 km resolution. Grid rotated by 36 degrees around z-axis. |
Publications
| ICON-DREAM README intro |
|---|
| ICON-DREAM Parametertabellen |
| ICON Database Reference Manual |
| DWD Database Reference for the Global and Regional ICON and ICON-EPS Forecasting System |
Contact
Deutscher Wetterdienst
Frankfurter Strasse 135
63067 Offenbach
Deutschland
e-mail: cdc.rea@dwd.de