Global Parallel Experiment Log

Experiment Name

QUIKSCAT Assimilation

Parallel Slot

PRY

Control Slot

MRF

Start date of parallel experiment

2001/06/19/06

End date of parallel experiment

2001/07/10/12

Environmental Modeling Center scientists

Tsann-wang Yu, Mark Iredell, William Gemmill, Dennis Keyser, Peter Caplan, Russ Treadon

Abstract (including Motivation, Hypothesis and Method)

QUIKSCAT ocean surface winds are assimilated in the global SSI atmospheric analyses. The motivations for this experiment are to test impact of QuikSCAT wind data, and to prepare the data for possible implementation in the operational GDAS later this summer. For this experiment, QuikSCAT wind data are thinned to have a 50 km resolution, and the data with a rain probability of greater than 10% are excluded due to the rain contamination problem associated with the data. Moreover, the data at the both ends of the swath (i.e, cell numbers 1 to 8, and 64 to 72) are assigned a larger observation error than that assigned to the other parts of the swath. This is done because the edge data are of poorer quality due to limits of radar design. The QuikSCAT winds are treated to be the same as ship winds data, with an observation error of 2.5 m/sec.

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

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