Global Parallel Experiment Log

Experiment Name

Prognostic Cloud Condensate with new Convection and new Radiation with latest analysis

Parallel Slot

PRY

Control Slot

MRF

Start date of parallel experiment

2001/02/13/06

End date of parallel experiment

2001/05/16/12

Environmental Modeling Center scientists

Shrinivas Moorthi, Ken Campana, Peter Caplan, Yu-Tai Hou, Mark Iredell, Hua-Lu Pan, Suru Saha, Russ Treadon, Glenn White

Abstract (including Motivation, Hypothesis and Method)

A number of improvements to the operational global model are slated for implementation in 2001. The motivations for these changes are

improved link between precipitation physics and clouds and radiation physics

improved analysis
OBSERVATIONAL AND ANALYSIS CHANGES
The saturation vapor pressure calculation is now made with respect to water, ice or mixed phase depending on temperature. The weight given to moisture constraint limit is reduced by one order of magnitude (i.e. from 1.0 to 0.1) The upper level moisture constraint limit is set to 100% relative humidity.
FORECAST AND POST PROCESSING CHANGES
The forecast model now includes prognostic cloud condensate. Fractional cloud cover is calculated diagnostically from the cloud condensate. The shortwave radiation is modified to take advantage of predicted cloud condensate path directly. A new aerosol scheme is also added to the shortwave radiation with monthly mean climatological aerosol distribution. The new convection scheme is the multi-cloud version of the SAS with momentum mixing; this is the same convection scheme that was in the PRX in September.

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 forecast maps for Hawaii by Bob Kistler

Conclusion

CAFTI presentation

CAFTI presentation (TDL)

Technical Procedures Bulletin or TPB

Global Parallel Home Page

Disclaimer