EOL Seminar: Estimating observation and model error variances using multiple data sets

Tuesday, February 20, 2018 - 15:30 to 16:30
Contact Name: 
Mike Reeves
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Dr. Richard Anthes
UCAR President Emeritus

In this paper we show how multiple data sets, including observations and models, can be combined using the “N-cornered hat method” to estimate vertical profiles of the errors of each system. Using data from 2007, we estimate the error variances of radio occultation, radiosondes, ERA-Interim and GFS model data sets at four radiosonde locations in the tropics and subtropics. A key assumption is the neglect of error covariances among the different data sets, and we examine the consequences of this assumption on the resulting error estimates.