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1. Forecast system version
System name: GCFS 2.01
First operational forecast run: April 2018September 2020
2. Configuration of the forecast model
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2.1 Atmosphere and land surface
| Model | ECHAM 6.3. |
|---|
05 (atmosphere) JSBACH (land) | |
| Horizontal resolution and grid | T127 (~100 km) on regular Gaussian grid |
|---|---|
| Atmosphere vertical resolution | L95 |
| Top of atmosphere | 0.01 hPa |
| Soil levels | 5 Level 1: 0 - 0.065 m Level 2: 0.065 - 0.319 m Level 3: 0.319 - 1.232 m Level 4: 1.232 - 4.134 m Level 5: 4.134 - 9.834 m |
| Time step | 200 s |
Detailed documentation:
ECHAM6: Stevens et al., 2013
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| Hindcast | Forecast | ||
|---|---|---|---|
| Atmosphere initialization | ERA-Interim | ERA5 | ERA5TECMWF operations |
| Atmosphere IC perturbations | none | none | |
Land Initialization | indirect via atmosphere initialization | indirect via atmosphere initialization | |
| Land IC perturbations | none | none | |
| Soil moisture initialization | indirect via atmosphere initialization | indirect via atmosphere initialization | |
| Snow initialization | indirect via atmosphere initialization | indirect via atmosphere initialization | |
| Unperturbed control forecast? | yes | yes |
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Data assimilation method for control analysis: no ensemble data assimilation
3.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | ORAS5 | ORAS5 |
| Ocean IC perturbations | The very first hindcast ensemble in 1990 starts with lagged initialisation of the 30 members by each one day. Subsequently, bred vectors add small disturbances to the global three-dimensional ocean temperature and salinity fields | bred vectors add small disturbances to the global three-dimensional ocean temperature and salinity fields |
| Unperturbed control forecast? | yes | yes |
More ocean data assimilation details:
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4. Model uncertainties perturbations:
| Model dynamics perturbations | no |
|---|---|
| Model physics perturbations | atmosphere: perturbation of diffusion in uppermost layer |
If there is a control forecast, is it perturbed? | unperturbed control forecast |
Detailed documentation: Baehr et al. (2015)
5. Forecast system and hindcasts
| Forecast frequency | monthly |
|---|---|
| Forecast ensemble size | 50 |
| Hindcast years | 1993 - |
| 2019 | |
| Hindcast ensemble size | 30 |
|---|---|
| On-the-fly or static hindcast set? | static |
6. Other relevant information
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