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The radiative transfer model RRTOV RTTOV has been upgraded from v12.1 to v12.2. This is a broad scientific and technical upgrade to the microwave observation operators RTTOV and RTTOV-SCATT. The upgrade allows RTTOV to use the most accurate science possible, it prepares the way for future sensors like Ice Cloud Imager (ICI). Band corrections are implemented for all microwave sensors, improving accuracy of simulated microwave radiances. RTTOV-SCATT now does its radiative transfer in terms of radiance, not brightness temperature, improving accuracy by several tenths of a Kelvin in some channels (this also prepares the way for future mm-wave sensors like ICI). All-sky dynamic emissivity retrievals have been externalised and use a newly-provided RTTOV framework. This involves minor changes and improvements in the scientific basis of the retrieval, such as the use of the correct clear-sky emissivity in the clear-sky column. New Mie-tables are used that have been generated using the new permittivity model of Rozenkranz (2015).. There has been an update to the infrared aerosol detection channels, and re-specification of related tuning parameters to make them consistent for AIRS, IASI, and CrIS.
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