Draft document. It needs to be reviewed (by MetOffice, Craig MacLachlan). I have just updated some details (name, first operational date) but the main of the changes needs to be done (I guess, table 3.1 essentially) Please review it carefully to fill in all the relevant details Page restrictions need to be disabled (so it becomes a public page) Simona Briceag when Craig has finished reviewing. The parent page would also need to be edited to add the link to this page This Warning needs to be removed |
System name: GloSea5-GC2-LI
First operational forecast run: 2 April 2019
Is it a coupled model? Yes: Atmosphere, land, ocean and sea-ice.
Coupling frequency: 3-hourly coupling between atmosphere-land and ocean--sea-ice.
The coupled model Global Coupled 2 (GC2) is described in Williams et al, 2015.
Model | Met Office Unified Model (UM) - Global Atmosphere 6.0 Joint UK Land Environment Simulator (JULES) - Global Land 6.0 |
---|---|
Horizontal resolution and grid | N216: 0.83 degrees x 0.56 degrees (approx 60km in mid-latitudes) |
Atmosphere vertical resolution | 85 levels |
Top of atmosphere | 85km |
Soil levels | 4 Level 1 : 0 - 0.1 m Level 2 : 0.1 - 0.35 Level 3 : 0.35 - 1.0 m Level 4 : 1.0 - 3.0 m |
Time step | 15 minutes |
Detailed documentation:
Global Atmosphere 6.0 & Global Land 6.0: Walters et al, 2017
Ocean model | NEMO v3.4 - Global Ocean 5.0 |
---|---|
Horizontal resolution | ORCA 0.25 |
Vertical resolution | L75 |
Time step | 22.5 minutes |
Sea ice model | CICE v4.1 - Global Sea-Ice 6.0 |
Sea ice model resolution | ORCA 0.25 |
Sea ice model levels | 5 categories + open water |
Wave model | N/A |
Wave model resolution | N/A |
Detailed documentation: NEMO documentation, CICE documentation
Global Ocean 5.0: Megann et al, 2014
Global Sea Ice 6.0: Rae et al, 2015.
Hindcast | Forecast | |
---|---|---|
Atmosphere initialization | ERA-Interim | Met Office Global Hybrid 4D-VAR |
Atmosphere IC perturbations | None | None |
Land Initialization | Climatology/ERA-Interim | Climatology/Met Office Global Hybrid 4D-VAR |
Land IC perturbations | None | None |
Soil moisture & temperature initialization | Met Office JULES-JRA55 analysis | Met Office JULES-JRA55 analysis |
Snow initialization | Met Office JULES-JRA55 analysis | Met Office JULES-JRA55 analysis |
Unperturbed control forecast? | No | No |
Detailed documentation:
Met Office Global Hybrid 4D-VAR: Clayton et al, 2013
Hindcast | Forecast | |
---|---|---|
Ocean initialization | GloSea Ocean Sea-Ice Analysis (GS-OSIA) | Forecast Ocean Assimilation Model (FOAM) |
Ocean IC perturbations | No | No |
Unperturbed control forecast? | No | No |
Detailed documentation:
The GS-OSIA and the FOAM system both use the Nucleus for European Modelling of the Ocean data assimilation system (NEMOVAR). This is a 3d-VAR data assimilation scheme. The GS-OSIA uses different surface forcing (ERA-interim) and observation sets as it is a historical analysis. FOAM uses surface forcing from the Met Office Global NWP model and real-time observations.
The common NEMOVAR system is described in Blockley et al, 2014. Details of the GS-OSIA can be found in MacLachlan et al, 2015.
Model dynamics perturbations | None |
---|---|
Model physics perturbations | Atmosphere stochastic physics scheme, SKEB2 |
If there is a control forecast, is it perturbed? | No control |
Detailed documentation:
Forecast frequency | daily |
---|---|
Forecast ensemble size | 2 per day |
Hindcast years | 24 (1993-2016) |
Hindcast ensemble size | 28 (4 start dates, 7 per start date) |
Hindcast start dates | 9, 17, 25 of month - 1 & 1 of month 0 |
On-the-fly or static hindcast set? | on-the-fly |
GloSea5 system:
Model description references:
Initialisation references: