Global Parallel Experiment Log

Experiment Name

T254 L64

Parallel Slot

PRX

Control Slot

MRF

Start date of parallel experiment

2001/09/27/06

End date of parallel experiment

ongoing

Environmental Modeling Center scientists

Mark Iredell, Hua-Lu Pan, Shrinivas Moorthi, Bob Kistler, John Derber, Weiyu Yang, Russ Treadon, Dave Parrish, Peter Caplan, Suru Saha, Glenn White

Abstract (including Motivation, Hypothesis and Method)

The model and analysis are run in T254 L64 resolution. The T254 resolution is associated with a 768 x 384 quadratic Gaussian grid used by the model and a 512 x 256 linear Gaussian grid used by the analysis. The horizontal resolution of the quadratic grid is about a 50 km mesh. The 64 sigma levels are still computed so that the sigma thicknesses are a quadratic function of sigma. The bottom sigma layer is 0.99732 or about 20 m above the ground. The top sigma layer is 0.000266 or about 60 km above the ground. The vertical resolution at 250 hPa is about 700 m.
Most of the changes to the operational system are associated with the resolution changes. The motivations for these changes are

to improve the global data assimilation system

to improve the short term forecast
OBSERVATIONAL AND ANALYSIS CHANGES

The domain decomposition and communication pattern in the analysis are better optimized.

The background error is newly computed using the NMC method.

AMSU-A channels 12 and 13 from NOAA-15 and NOAA-16 and HIRS from NOAA-16 are used.
FORECAST AND POST PROCESSING CHANGES

The forecast resolution is T254 L64 to hour 84, T170 L42 to hour 180, and T126 L28 to hour 384.

The horizontal diffusion is made more general, using 6th order diffusion.

Several minor bugs are corrected.

Experiment changes log

Implementation changes list

Product changes list

Background links

Evaluation of parallel results

Daily forecast maps by Pete Caplan

Daily forecast stats by Pete Caplan

Verification of precipitation by Hua-Lu Pan

Verification against sondes and aircraft timeseries by Suru Saha

Verification against rawinsondes horizontal maps by Suru Saha

Verification against rawinsondes vertical maps by Suru Saha

Daily forecast maps for Hawaii by Bob Kistler

Conclusion

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