Global Parallel Experiment Log

Experiment Name

Satellite radiance and moisture analysis changes

Parallel Slot

PRX

Control Slot

MRF

Start date of parallel experiment

2000/10/02/12

End date of parallel experiment

2001/02/13/00

Environmental Modeling Center scientists

John Derber, Peter Caplan, Mark Iredell, Hua-Lu Pan, Suru Saha, Russ Treadon, Glenn White

Abstract (including Motivation, Hypothesis and Method)

A number of minor improvements to the operational global analysis are slated for implementation in late 2000. The motivations for these changes are (1) improved use of satellite radiances, (2) improved moisture analysis, and (3) preparation for use of future satellite radiances/products
OBSERVATIONAL AND ANALYSIS CHANGES
Numerous changes are made to the analysis of satellite radiances and the moisture analysis. These changes include:

inclusion of GOES-10 and AMSU-B radiances

updated radiative transfer coeffients for OPTRANS

enhanced AMSU-A quality control

enhanced bias correction of radiance data

changes in satellite data thinning and channel selection

modification of near surface observation errors for surface pressure, temperature, moisture, and wind observations

generalization of moisture constraint to include temperature and pressure sensitivities. reformulation of constraint in terms of vapor pressure. retuning of weights for upper and lower constraint limits.

option to modify moisture background error to enhance local sensitivity

preparation for use of NOAA-16 AMSU-A, AMSU-B, and HIRS radiance data

preparation for use of SSM/I and TRMM precipitation data

various code simplication and optimization changes
FORECAST AND POST PROCESSING CHANGES
The post processor now computes height and relative humidity at both the lowest and highest freezing levels. The post processor also smoothes the sea level pressure to about T80.

Experiment changes log

Implementation changes list

Product changes list

Background links

Global Data Assimilation Group by Russ Treadon

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

Conclusion

Implemented 2001/02/13/12

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