Intercomparison of Solar Radiometer and Radio Sounding Water Vapor Columns for Atmospheric Processing of Imaging Spectroscopy Data
نویسندگان
چکیده
Two methods for the measurement of the column water vapor in the atmosphere are compared with respect to their usefulness for imaging spectrometer campaigns. First, in situ measurements of 26 radiosonde launches are integrated with height to obtain the water vapor column. Second, simultaneous ground irradiance measurements using a sun photometer are inverted to column water vapor amounts. An exact calibration of the solar radiometer is performed to increase the measurement accuracy. The results obtained by the radiometric method differ from the in situ measurements within the relative accuracy of the balloon-borne humidity sensors. The largest differences are attributed to dusty, highly humid atmospheric conditions. We conclude that sun photometry is a viable substitute to in situ water vapor measurement for the validation of atmospheric correction methods and in flight sensor calibration.
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