Horizontale resolutie operationele run verhoogd van T511 naar T799 (ofwel van N256 naar N400, van roosterpuntsafstand ~40 km naar ~25 km).
Verticale resolutie verhoogd van 60 naar 91 lagen, modeltop verhoogd van 0.1 naar 0.01 hPa. EPS resoluties tevens verhoogd, plus nog wat andere wijzigingen.
Zie hieronder de tekst van het ECMWF.
Groet,
Alwin
P.S. Mogelijk is deze upgrade al aan bod geweest hier.
1 February 2006 Introduction of Cycle 30r1. This version includes the following changes:
Increase in horizontal resolution to T799 for the deterministic forecast and the outer loops of 4D-Var.
Increase in vertical resolution to 91 levels for the deterministic model. Model top raised to 0.01 hPa.
Increase in horizontal resolution to T255 for the second inner loop of 4D-Var.
Increase in horizontal resolution to T399 and in vertical resolution to 62 levels (model top approx. 5 hPa) for the EPS.
Increase in horizontal resolution to 0.36 degrees for the global ocean wave model.
Increase wave spectral resolution to 24 directions and 30 frequencies (from 12 and 25 respectively) for the EPS ocean wave model.
Use of grid-point humidity and ozone in 4D-Var.
Revised coefficients (version 2.3) for the linearised ozone chemistry scheme, supplied by Daniel Cariolle, CERFACS.
Use of Jason altimeter wave height data and ENVISAT ASAR spectra in the wave model data assimilation. ERS-2 SAR spectra are no longer assimilated.
The impact of the new cycle on the performance of the deterministic forecast system has been tested on more than 360 cases between July 2004 and December 2005. The e-suite is now running in near-real-time in step with operations.
The impact on the performance of the forecasting system has been evaluated comprehensively checking out all components of the system. There are small but statistically significant improvements to deterministic 500 hPa height forecasts over Europe and for both extra-tropical hemispheres out to day 6. Overall impact on weather parameters is modest, but precipitation scores over Europe are consistently improved, in particular for large daily rainfall amounts.
Tropical temperature and wind forecasts are generally better when verified against radiosondes. Tropical cyclone position and intensity forecasts are improved in the high resolution system with some spectacular results for the intense hurricanes, such as Katrina, which hit the US Gulf Coast last autumn.
There are increases in the number of observations used in the assimilation with better analysis and background departure statistics. Extra data also had a significant beneficial impact on the ocean wave analyses. Verification against independent observations confirmed improvements in the ocean wave forecasts.
The Ensemble Prediction System has been tested for some 30 cases in July and August 2005 and again in the e-suite over the period 17 October to 30 November 2005. The overall benefit of the higher resolution for the EPS is reflected in the results for the probability scores which are consistently improved for 500hPa height anomalies. In a similar way, the evaluation of precipitation events over Europe gave better results for the e-suite with respect to the Brier and ROC area scores.
Technical implications of the changes in cy30r1:
The new model cycle will be used throughout the ECMWF forecast suites, including the monthly system and the BC Optional Project, but not in the seasonal (system 2) suite. The atmospheric model identification number in the GRIB headers will change from 126 to 127.
Model numbers for the Global wave model will remain at 116. Also for the European waters wave model the number will remain 216.
Verticale resolutie verhoogd van 60 naar 91 lagen, modeltop verhoogd van 0.1 naar 0.01 hPa. EPS resoluties tevens verhoogd, plus nog wat andere wijzigingen.
Zie hieronder de tekst van het ECMWF.
Groet,
Alwin
P.S. Mogelijk is deze upgrade al aan bod geweest hier.
1 February 2006 Introduction of Cycle 30r1. This version includes the following changes:
Increase in horizontal resolution to T799 for the deterministic forecast and the outer loops of 4D-Var.
Increase in vertical resolution to 91 levels for the deterministic model. Model top raised to 0.01 hPa.
Increase in horizontal resolution to T255 for the second inner loop of 4D-Var.
Increase in horizontal resolution to T399 and in vertical resolution to 62 levels (model top approx. 5 hPa) for the EPS.
Increase in horizontal resolution to 0.36 degrees for the global ocean wave model.
Increase wave spectral resolution to 24 directions and 30 frequencies (from 12 and 25 respectively) for the EPS ocean wave model.
Use of grid-point humidity and ozone in 4D-Var.
Revised coefficients (version 2.3) for the linearised ozone chemistry scheme, supplied by Daniel Cariolle, CERFACS.
Use of Jason altimeter wave height data and ENVISAT ASAR spectra in the wave model data assimilation. ERS-2 SAR spectra are no longer assimilated.
The impact of the new cycle on the performance of the deterministic forecast system has been tested on more than 360 cases between July 2004 and December 2005. The e-suite is now running in near-real-time in step with operations.
The impact on the performance of the forecasting system has been evaluated comprehensively checking out all components of the system. There are small but statistically significant improvements to deterministic 500 hPa height forecasts over Europe and for both extra-tropical hemispheres out to day 6. Overall impact on weather parameters is modest, but precipitation scores over Europe are consistently improved, in particular for large daily rainfall amounts.
Tropical temperature and wind forecasts are generally better when verified against radiosondes. Tropical cyclone position and intensity forecasts are improved in the high resolution system with some spectacular results for the intense hurricanes, such as Katrina, which hit the US Gulf Coast last autumn.
There are increases in the number of observations used in the assimilation with better analysis and background departure statistics. Extra data also had a significant beneficial impact on the ocean wave analyses. Verification against independent observations confirmed improvements in the ocean wave forecasts.
The Ensemble Prediction System has been tested for some 30 cases in July and August 2005 and again in the e-suite over the period 17 October to 30 November 2005. The overall benefit of the higher resolution for the EPS is reflected in the results for the probability scores which are consistently improved for 500hPa height anomalies. In a similar way, the evaluation of precipitation events over Europe gave better results for the e-suite with respect to the Brier and ROC area scores.
Technical implications of the changes in cy30r1:
The new model cycle will be used throughout the ECMWF forecast suites, including the monthly system and the BC Optional Project, but not in the seasonal (system 2) suite. The atmospheric model identification number in the GRIB headers will change from 126 to 127.
Model numbers for the Global wave model will remain at 116. Also for the European waters wave model the number will remain 216.
