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A method to compare upper tropospheric humidity (UTH) from  satellite and radiosonde data has been applied to the European  radiosonde stations. The method uses microwave data as a benchmark  for monitoring the performance of the stations. The present study  utilizes three years (2001-2003) of data from channel 18  (183.31±1.00 GHz) of the Advanced Microwave Sounding Unit-B  (AMSU-B) aboard the satellites NOAA-15 and NOAA-16. The comparison is  done in the radiance space, the radiosonde data were transformed to  the channel radiances using a radiative transfer model. The  comparison results confirm that there is a dry bias in the UTH  measured by the radiosondes. This bias is highly variable among the  stations and the years. This variability is attributed mainly to  the differences in the radiosonde humidity measurements. The  analysis also shows a difference between daytime and nighttime  soundings which is attributed to radiation error in the radiosonde  data. The dry bias due to this error alone correspond to  approximately 11% relative error in the UTH measurements

Comparison of microwave satellite humidity data and radiosonde profiles: A survey of European stations