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| Model | ECHAM 6.3.05 (atmosphere) JSBACH 3.20 20p1 (land) |
|---|---|
| Horizontal resolution and grid | T127 (~100 km) on regular Gaussian grid |
| Atmosphere vertical resolution | L95 |
| Top of atmosphere | 0.01 hPa |
| Soil levels (layers) | 5 Layer 1: 0 - 0.065 m |
| Time step | 200 s |
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Detailed documentation: MPIOM: Jungclaus et al., 2013
3. Boundary conditions - climate forcings
The forcing database for radiative parameters like ozone, aerosol and greenhouse gases is provided by CMIP6 for the historical period up to 2014. Afterwards, data of RCP 4.5 future scenarios is used.
| Greenhouse gases | CMIP6 |
|---|---|
| Ozone | CMIP6 |
| Tropospheric aerosols | MACv2 |
| Volcanic aerosols | CMIP6 |
| Solar forcing | yes |
Detailed documentation:
For aerosols: Stevens, B., Fiedler, S., Kinne, S., Peters, K., Rast, S., Müsse, J., Smith, S. J., and Mauritsen, T.: MACv2-SP: a parameterization of anthropogenic aerosol optical properties and an associated Twomey effect for use in CMIP6, Geosci. Model Dev., 10, 433–452, https://doi.org/10.5194/gmd-10-433-2017, 2017.
4. Initialization and initial condition (IC) perturbations
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| Hindcast | Forecast | ||
|---|---|---|---|
| Atmosphere initialization | ERA5 | ERA5T | |
| Atmosphere IC perturbations | none | pertubation of diffusion in the uppermost layer | pertubation of diffusion in the uppermost layernone |
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? | yesnoyes | no |
The assimilation for the atmosphere employs Newtonian relaxation of the reference data with the following variable-dependent relaxation times:
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7. Other relevant information
Interpolation details
Horizontal Interpolation
Vertical interpolation
8. Where to find more information
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