Articles | Volume 11, issue 2
Research article
16 Feb 2018
Research article |  | 16 Feb 2018

Intercalibration between HIRS/2 and HIRS/3 channel 12 based on physical considerations

Klaus Gierens, Kostas Eleftheratos, and Robert Sausen

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Short summary
HIRS channel 12 on the series of NOAA weathersatellites is sensitive to humidity in the upper troposphere. A change in its central wavelength between NOAA 14 and 15 made it necessary to perform an intercalibration to retain a homogeneous time series. Here we show that the intercalibration of Shi and Bates (2011), which is based on statistical methods, can be underpinned by physical arguments using results of radiative transfer calculations.