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We have shown that we expect significant improvement in the CPC stratospheric temperature analyses when we transition to the NESDIS temperature retrievals derived from the Advanced Microwave Sounding Unit. We expect that switch to AMSU data to occur in the CPC stratospheric analyses in early 2001. However, when the change occurs, we must determine the optimum way to transition from CPC use of the SSU data to the CPC use of the AMSU data, to ensure a consistent data set for climatological use.
Atmospheric diurnal and semi-diurnal temperature variations contribute significantly to the observed differences between satellite observations and analyses that use those satellite data. For this reason we plan to introduce two daily analyses in addition to the current 1200 UT CPC stratospheric temperature analysis which uses 12 hours of ascending and descending satellite data). The new analyses will be based on separate morning or afternoon (24 hours of ascending or descending orbital) observations. Separate morning and afternoon analyses will clarify the time-of-day factor for users of CPC stratospheric analyses, and allow better temperature comparisons with sunrise and sunset occultation experiments and with data from NOAA SBUV/2 ozone monitoring instruments.
See CPC stratospheric web site: http://www.cpc.noaa.gov.
AMSU information http://orbit-net.nesdis.noaa.gov/crad/st/amsuclimate/amsu.html.