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We have analysed the upper tropospheric humid- ity with respect to ice (UTHi) data product obtained from the Television Infrared Observation Satellite (TIROS) Oper- ational Vertical Sounder (TOVS) instrument onboard the Na- tional Oceanic and Atmospheric Administration NOAA-14 polar orbiting satellite. While in the production of the offi- cial UTHi product values in excess of 100% are ignored, we do not so - in view of many recent results obtained from a va- riety of other in-situ and remote sensing instruments showing that ice supersaturation frequently occurs in the upper tropo- sphere. We show that TOVS is able to detect ice supersatu- ration at the correct locations (however, only in less than one percent of its soundings, presumably because of TOVS's low vertical resolution), and that the supersaturation follows the well known exponential behaviour. We conclude that val- ues of UTHi in excess of saturation should not be consid- ered a measurement error anymore. The similar re-analysis of TOVS data back to 1979 could give important insights into trends of upper tropospheric humidity.

Ice supersaturation as seen from TOVS