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About the ACCESS model
The Australian Community Climate and Earth-System Simulator (ACCESS) weather models have been developed and tested by research staff from the Centre for Australian Weather and Climate Research (CAWCR) and are based on the UK Meteorological Office's Unified Model. The ACCESS suite of models has shown a significant improvement in accuracy over the Bureau's old weather model suite (GASP, LAPS and MesoLAPS), and output is available in map form or as gridded data products.
Model | ACCESS-G |
---|---|
Domain | Global |
Resolution | Approximately 80km |
Previous Model Equivalent | Global Analysis and Prediction (GASP) |
Time Step and Duration | 6 hourly to 168 hours (7 days) |
Model Run Times and Typical Availability Times | 00Z run available 0610Z 12Z run available 1810Z |
Views | Global Southern Hemisphere Australia Indian Ocean Pacific Ocean |
Available Elements | Precipitation Mean sea level pressure (MSLP) Surface pressure & rainfall (MSLP & precipitation) MSLP & thickness Wind speed and direction at 10m, 850hPa, 700hPa, 500hPa, 200hPa, and gradient Geopotential height at 850hPa, 700hPa, 500hPa, and 200hPa Temperature at 2m screen, 850hPa, 700hPa, 500hPa, 200hPa 2m screen dew point Relative humidity at 2m screen, 850hPa, 700hPa, 500hPa, and 200hPa Stability field |
Model | ACCESS-R |
---|---|
Domain | Regional |
Resolution | 0.11° (~12km) |
Previous Model Equivalent | Limited Area Prediction System (LAPS_PT375) |
Time Step and Duration | 3 hourly to 72 hours (3 days) |
Model Run Times and Typical Availability Times | 00Z run available 0230Z 06Z run available 0830Z 12Z run available 1430Z 18Z run available 2030Z |
Views | Full domain Australia |
Available Elements | Precipitation Mean sea level pressure (MSLP) Surface pressure & rainfall (MSLP & precipitation) MSLP & thickness Wind speed and direction at 10m, 850hPa, 700hPa, 500hPa, 200hPa, and gradient Geopotential height at 850hPa, 700hPa, 500hPa, and 200hPa Temperature at 2m screen, 850hPa, 700hPa, 500hPa, 200hPa 2m screen dew point Relative humidity at 2m screen, 850hPa, 700hPa, 500hPa, and 200hPa |
Model | ACCESS-A |
---|---|
Domain | Australia |
Resolution | 0.11° (~12km) |
Previous Model Equivalent | MesoLAPS (MESO_LAPS_PT125 & MA_LAPS_PT100) |
Time Step and Duration | 3 hourly to 48 hours (2 days) |
Model Run Times and Typical Availability Times | 00Z run available 04Z 06Z run available 10Z 12Z run available 16Z 18Z run available 22Z |
Views | Australia 7 Regional areas TODO |
Available Elements | Precipitation Mean sea level pressure (MSLP) Surface pressure & rainfall (MSLP & precipitation) MSLP & thickness Wind speed and direction at 10m, 850hPa, 700hPa, 500hPa, 200hPa, and gradient Geopotential height at 850hPa, 700hPa, 500hPa, and 200hPa Temperature at 2m screen, 850hPa, 700hPa, 500hPa, 200hPa 2m screen dew point Relative humidity at 2m screen, 850hPa, 700hPa, 500hPa, and 200hPa |
Model | ACCESS-T |
---|---|
Domain | Tropical |
Resolution | 0.375° (~37.5km) |
Previous Model Equivalent | Tropical (Extendd Domain) LAPS (TXLAPS_PT375) |
Time Step and Duration | 6 hourly to 72 hours (3 days) |
Model Run Times and Typical Availability Times | 00Z run available 0430Z 12Z run available 1630Z |
Views | Full domain RSMC Australia SE Asia SW Pacific Northern Territory Western Australia Fiji TODO |
Available Elements | Precipitation Mean sea level pressure (MSLP) Surface pressure & rainfall (MSLP & precipitation) MSLP & thickness Wind speed and direction at 10m, 850hPa, 700hPa, 500hPa, 200hPa, and gradient Geopotential height at 850hPa, 700hPa, 500hPa, and 200hPa Temperature at 2m screen, 850hPa, 700hPa, 500hPa, 200hPa 2m screen dew point Relative humidity at 2m screen, 850hPa, 700hPa, 500hPa, and 200hPa Deep layer mean wind |
Model | ACCESS-C+ |
---|---|
Domain | City |
Resolution | 0.05° (~5km) |
Previous Model Equivalent | City-based MesoLAPS variants (MESO_LAPS_PT050 models) |
Time Step and Duration | 1 hourly to 72 hours (3 days) |
Model Run Times and Typical Availability Times | 00Z run available 03-0310Z 12Z run available 15-1510Z |
Views | Victoria/Tasmania Sydney Brisbane Adelaide Perth |
Available Elements | Precipitation Meteograms Wind speed and direction at 2m, 10, gradient, and 850hPa Mean sea level pressure (MSLP) |
Model | ACCESS-TC |
---|---|
Domain | 3 relocatable domains |
Resolution | 0.11° (~12km) |
Previous Model Equivalent | Tropical-cyclone LAPS (TCLAPS) |
Time Step and Duration | |
Model Run Times and Typical Availability Times | Run on demand |
Views | |
Available Elements | Tracks |
Model | ACCESS-O3 |
---|---|
Domain | Global |
Resolution | Approximately 80km |
Previous Model Equivalent | Specialist model to replace the ozone and UV components of GASP |
Time Step and Duration | 6 hourly to 168 hours (7 days) |
Model Run Times and Typical Availability Times | 00Z run available 07Z |
Views | Global Southern hemisphere Australia |
Available Elements | UV index Total ozone |
Upper air charts are generally labelled with the pressure level in hectopascals (hPa), e.g. 500 hPa. The pressure decreases as altitude increases. For instance, the 250 hPa level is higher than the 500 hPa level. For some fields there are also charts representing the atmosphere 2 metres and 10 metres above the ground, and at the "gradient" level which lies about 1000 metres above the earth's surface and is the level most representative of the air flow in the lower atmosphere immediately above the layer affected by surface friction. This level is free of local wind and topographic effects (such as sea breezes, downslope winds etc).
Some charts show geopotential height, which approximates the actual height of a pressure surface above mean sea-level. Therefore, geopotential height contours on a particular map, e.g. 850 hPa, represent the height of that pressure surface.
Charts showing precipitation represent the amount of rainfall in millimetres which is forecast to fall at the ground over the preceding 3 or 6 hours. The period is shown in the chart heading as "3 hrly" or "6 hrly".
More detailed technical information on the ACCESS models is available in the NMOC Operations Bulletin No. 83 or the ACCESS NWP Data Documentation.
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