Monitoring and Validation of Water Vapour Products from Envisat Mwr and Meris
نویسندگان
چکیده
ENVISAT Microwave Radiometer (MWR) and Medium Resolution Imaging Spectrometer (MERIS) water vapour products are received, monitored and validated at ECMWF. The corresponding model total column water vapour (TCWV) product is used for the verification. The MWR products are generally of good quality since late November 2003. However, there are several apparently wrong measurements due to the sea ice contamination. Most of those measurements can be eliminated by making use of the model ice mask. On the other hand, MERIS TCWV is of satisfactory quality since early May 2006. The product is, in general, dryer and noisier than the model or even the MWR measurements. Jason-1 microwave radiometer (JMR) TCWV product, which is also received and validated, is used for the verification as well. Preliminary results of triple collocation exercises showed that JMR has lowest error (less than 4%) followed by MWR and the model with errors slightly more than 5%. MERIS has the largest error of about 16%.
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