|Implementation date ||10 Mars 2009 ||See Newsletter No.121 |
|Key characteristics of our current forecasting system || |
|Resolution || |
- HRES: TL799
- ENS: Leg A TL399
- HRES: 0.25 degrees
- ENS: 0.5 degrees
|Data set affected || |
|Meteorological changes || |
- Revised snow scheme including a diagnostic liquid water storage and a new density formulation
- Revised ozone chemistry
- Active assimilation of IASI humidity channels and consistent use of AIRS and IASI humidity channels.
- Activate all-sky 4D-VAR assimilation of microwave imagers
- Increase of the weight to GPS radio occultation data above 26 km, and use of the data up to 50 km
- Various satellite-related modifications, including activation of version 9 of the radiative transfer software package RTTOV-9 (developed by NWP-SAF) and revised HIRS cloud detection
- TL/AD longwave radiation (removal of the neural network), optimization of the non-linear code for simplified longwave radiation and optimization (NL, TL, AD) of the shortwave radiation scheme
- Extend the domain of the wave model from 81 º to 90 º North
- Use of ERA-interim analyses for the EFI reforecasts
|Meteorological impacts || |
Overall the new cycle is neutral in terms of verification scores for both hemispheres and the tropics.
- Improvements to 2m temperature bias and slightly better performance for recent tropical cyclones in both position and intensity.
- Synoptic performance is generally similar to current operations.
- Impact on EFI from the change to using ERA-interim analyses for its reforecasts is not substantial.
|Technical changes || - |
|Model ID || |
- Atmospheric: 134
- Ocean wave: 119
- Limited-area ocean wave: 219
|New disseminated model output ||- || |
|Discontinued disseminated model output ||0042 || |