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System Configuration Information

These information can be changed if the corresponding operational model is modified.

GPC Melbourne

GPC Melbourne
When was the current long-range forecast system implemented? POAMA2, October 2011
Latest operational version POAMA2.4 run twice per month since October 2011
Is it a coupled forecast system? Yes
Is it a Tier-2 forecast system? No
Atmospheric model resolution Spectral, T47L17
Ocean model (if applicable) ACOM2 Ocean model based on GFDL MOM2: 2°zonal, meridional 0.5° within 8° of the equator, increasing gradually to 1.5° near the poles, 25 levels in vertical.
Source of atmospheric initial conditions POAMA2.4 is Initialised through an atmosphere/land initialisation (ALI) scheme based on 'nudging' atmospheric fields from Bureau NWP system.
Source of ocean initial conditions The ocean model is initialised using an ocean data assimilation scheme based on the POAMA Ensemble Ocean Data Assimilation System (PEODAS; Yin et al. 2011).
If Tier-2, what is the source of SST predictions? N/A
Hindcast period 1980-2011 for POAMA M2.4
Ensemble size for the hindcasts 99
How is the hindcast ensemble configured? A hindcast set was produced from 1960-2010. Initialised on the 1st day of each calendar month, a 10 member, 9-month forecast has been generated for each of three model configurations of POAMA2. Each member's initial conditions differ only in the ocean state (the atmosphere is the same for all ensemble members) by taking the 10 different initial conditions from the PEODAS assimilation scheme
Ensemble size for the forecast 33
How is the forecast ensemble configured? The real-time forecast system of POAMA2 is similar to that of POAMA1.5, but instead of the single version of the forecast model used in POAMA1.5, there are three versions of the model with different configurations implemented in POAMA2. Each version of the forecast model produces an ensemble of 10 members, and the forecasts from the 3 models are combined to form a 30 member multi-model ensemble. The forecasts are generated twice per month using initial conditions that are valid on the 1st and 15th of the month
Length of forecasts 9 months
Data format netCDF
What is the latest date predicted anomalies for the next month/season become available? The POAMA M24 forecast is updated twice a week. 
How are the forecast anomalies constructed? Departures from the model climate estimated by the hindcast integrations
URL where forecast are displayed http://poama.bom.gov.au http://www.bom.gov.au/silo/products/poama/ (registered user site)
Point of Contact Aihong Zhong (A.Zhong@bom.gov.au)

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