Global Parallel Experiment Log

Experiment Name

Summer 2000 analysis and forecast changes

Parallel Slot

PRY

Control Slot

MRF

Start date of parallel experiment

2000/07/05/12

End date of parallel experiment

2000/10/02/06

Environmental Modeling Center scientists

Hua-Lu Pan, Ken Campana, Pete Caplan, Bill Collins, John Derber, Yu-tai Hou, Mark Iredell, S. Moorthi, Suru Saha, Joe Sela, Russ Treadon, Glenn White, Wan-Shu Wu

Abstract (including Motivation, Hypothesis and Method)

A number of improvements to the operational global model are slated for implementation in September 2000. The motivations for these changes are

improved ozone analyses and forecasts,

improved use of rawinsonde data,

improved representation of orography particularly over Antarctica,

improved model forecast efficiency, and

improved summertime forecast bias near the continental surface.
OBSERVATIONAL AND ANALYSIS CHANGES
The complex quality control provides a new observation error diagnosis. The rawinsonde radiation correction has been upgraded, too. The impacts of rawinsonde balloon drift in both space and time are included. A new ozone analysis background error is applied to avoid spurious far-field effects in data sparse regions.
FORECAST AND POST PROCESSING CHANGES
The terrain fields are recomputed from new USGS orography datasets. The orography is filtered in the highest wavenumbers to reduce "ringing". A reduced grid over polar regions is used in the MRF to gain efficiency. A reversible interpolation is used to keep the surface file on a full grid for compatibility. New albedo climatology is used and aerosols are used in the shortwave radiation and the shortwave radiation single scattering albedo parameter is recalibrated all to reduce the summertime continental near surface warm bias.

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 rawinsondes timeseries by Suru Saha

Verification against rawinsondes horizontal maps by Suru Saha

Verification against rawinsondes vertical maps by Suru Saha

Daily total ozone maps by Russ Treadon

Conclusion

Implemented 2000/10/02/06

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