1. Forecast system version
Identifier code: ACCESS-S2
First operational forecast run: 20 October 2021
2. Configuration of the forecast model
Is the model coupled to an ocean model? Yes: Atmosphere, land, ocean and sea-ice.
Coupling frequency: Hourly
The coupled model is described in Wedd et al (2022).
2.1 Atmosphere and land surface
| Model | Global Atmosphere 6.0 (GA6): The Unified Model version 8.6 (UM; Williams et al. 2015; Walters et al. 2017). Global Land 6.0 (GL6): Joint UK Land Environment Simulator (JULES; Best et al. 2011; Walters et al. 2017) |
|---|---|
| Horizontal resolution and grid | N216 (~60km in the mid-latitudes) |
| Atmosphere vertical resolution | 85 levels |
| Top of atmosphere | |
| Soil levels | Four soil levels |
| Time step |
Detailed documentation:
2.2 Ocean and cryosphere
| Ocean model | NEMO |
|---|---|
| Horizontal resolution | ORCA 0.25 |
| Vertical resolution | L75 |
| Time step | |
| Sea ice model | CICE |
| Sea ice model resolution | ORCA 0.25 |
| Sea ice model levels | |
| Wave model | N/A |
| Wave model resolution | N/A |
Detailed documentation: NEMO documentation, CICE documentation
3. Boundary contitions - climate forcings
| Greenhouse gases | |
|---|---|
| Ozone | |
| Tropospheric aerosols | |
| Volcanic aerosols | |
| Solar forcing |
Detailed documentation:
4. Initialization and initial condition (IC) perturbations
4.1 Atmosphere and land
| Hindcast | Forecast | |
|---|---|---|
| Atmosphere initialization | ||
| Atmosphere IC perturbations | ||
Land Initialization | ||
| Land IC perturbations | ||
| Soil moisture initialization | ||
| Snow initialization | ||
| Unperturbed control forecast? |
Data assimilation method for control analysis:
Horizontal and vertical resolution of perturbations:
Perturbations in +/- pairs:
Detailed documentation:
4.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | ||
| Ocean IC perturbations | ||
| Unperturbed control forecast? |
Detailed documentation:
5. Model Uncertainties perturbations:
| Model dynamics perturbations | |
|---|---|
| Model physics perturbations | |
If there is a control forecast, is it perturbed? |
Detailed documentation:
6. Forecast system and hindcasts
| Forecast frequency | |
|---|---|
| Forecast ensemble size | |
| Hindcast years | |
| Hindcast ensemble size | |
| On-the-fly or static hindcast set? | |
| Calibration (bias correction) period |
