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POAMA-2 Hindcasts and Forecasts on OPeNDAP Server

Introduction

POAMA-2 hindcast and realtime data are now available on an OPeNDAP server.

Conditions of Use

The data is made available for research collaboration only. Full conditions of use.

The Model Configuration

POAMA-2 consists of both a seasonal and a monthly forecast system using version 2.4 of the model. POAMA-2 is also a multi-model ensemble consisting of three different model configurations. For the seasonal forecasts these configurations are called p24a, p24b and p24c and for the multi-week forecasts they are called m24a, m24b, m24c

Data available - Structure on the OPeNDAP Server

The data that is available on the OPeNDAP Server is catalogued under the following folder/directory structure.

Higher Level Directories

These are the directories that are available on the OPeNDAP server.

1. Current POAMA system
1. POAMA 2.4 Multiweek Real Time Forecasts/
2. POAMA 2.4 Multiweek Hindcasts from 1981/
2. Ocean Re-analysis
1. PEODAS Re-Analysis/
2. PEODAS Real Time/
3. Previous POAMA systems
1. POAMA 2.4 Seasonal Real Time Forecasts/
2. POAMA 2.4 Seasonal Hindcasts from 1960/
3. POAMA 1.5 Data Catalog/
4. Other POAMA Related Datasets
1. POAMA 2.4 Control Runs/

Second Level Directories of the Current POAMA system

The m24 dataset has been broken up into Daily, Weekly, Monthly time spans. This minimises the number of files presented, but not all the files are listed, so the "All Multiweek Realtime Forecasts" directory contains the complete list of files.

1. Daily Datasets
1. Model A/
2. Model B/
3. Model C/
4. Multimodel/
2. Weekly Datasets
1. Model A/
2. Model B/
3. Model C/
4. Multimodel/
3. Monthly Datasets
1. Model A/
2. Model B/
3. Model C/
4. Multimodel/
4. Masks
5. Atmosphere Mask File
6. Ocean Mask File
7. Multiweek Realtime Tailored Products/
8. All Multiweek Realtime Forecasts/

Lower Level Directories

In the POAMA Hindcast and Forecast folders, there are a number of ensemble folders and climatology folders:

• Seasonal: 10 Ensemble folders and an Ensemble Mean folder; (e01 -> e10 & emn)
• Multiweek: 11 Ensemble folders and an Ensemble Mean folder; (e00 -> e10 & emn)
• Climatology Folders: in the form of model_clim_YYYY-YYYY (specifically model_clim_1981-2010)

Multi Model Configurations and Multi Model Anomanlies

Three different model configurations are used (p24a, p24b, p24c) for the seasonal and (m24a, m24b, m24c) for the monthly/multi-week configurations. These should be used together to form a multi-model ensemble. Ensure that you use the Model's Climatology with the Model's Ensemble or Ensemble Mean when determining Multi Model Anomalies.

Note about Model Climatology

Model climatology is calculated by averaging all ensemble members, for a given start date in the year, over all the years specified in the climatology. The climatologies are lead-time dependent.

The model climatology files will have the same format as the individual forecasts, one can then calculate anomalies by subtracting the climatology from the forecast file. Be aware that the climatology file may be shorter that the individual ensemble files.

File Naming Convention

Current files - Atmoshpere only

Older files - these files are Ocean files and pre-processed Atmosphere files

Known Issues

Data available - Historical Structure

A description of the older POAMA files and the planned progression of files (this is a dated page).

A description of how to get the Daily Forecast from the OPeNDAP Server.

OPeNDAP server

Click here to go to OPeNDAP server

For further information: email the POAMA group