Abstract
Passive microwave observations from the Microwave Sounding Unit (MSU) on board the National Oceanic and Atmospheric Administration (NOAA) series of spacecraft have been shown to be useful for long-term global atmospheric temperature monitoring. The Special Sensor Microwave/Temperature (SSM/T) sounder, on board the Defense Meteorological Satellite Program (DMSP) spacecraft, is equipped with twice as many atmospheric channels as the MSU. First flown in 1979, archived SSM/T data are available since 1987. As an initial effort to assess the utility of this data source for climate monitoring, antenna temperatures from the two operational SSM/T instruments were compared by channel, beam position, and latitude. Results indicate antenna temperatures from one SSM/T (F8) are systematically 1–3 K higher than from the other (F9). Also, asymmetries exist with respect to beam positions.
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