What are the estimated accuracy of the GOES sounder-derived Lifted Index (LI) and Total Precipitable Water (TPW) products ?
A13. One way to estimate the accuracy of the GOES sounder products is by comparing them to co-located radiosondes. Of course the GOES sounder does not measure the exact same space (point measurement versus a volumetric one) or time (co-locations are required to be within one hour) as the radiosonde, but the comparisons can still be informative. In general, due to the limited number of channels, the retrieved profile will be much smoother in the vertical than a radiosonde. TPW: An improvement in moisture detection is evident when comparing both sounder retrievals and the first guess to radiosondes. For example, for the period from April 1996 through February 1997 the improvement for the Root-Mean-Square Error (RMSE) of the total water vapor (TPW) is roughly 20% (3.3 to 2.6 mm). The RMSE = SquareRoot ((Bias*Bias) + (StandardDeviation *StandardDeviation)) LI: For the lifted index (LI), the RMSE between the retrievals and the radiosondes is approximately 2 degrees. The changes in space or
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