Impact experiments assimilating GRACE‐A and CHAMP GPS radio occultation (GPSRO) bending angle profiles are presented. The standard deviation of the observation minus background bending angle departures above 35‐km is 30% smaller for GRACE‐A than CHAMP, indicating that the GRACE‐A measurements are more accurate. Assimilating the GPSRO measurements improves stratospheric temperatures in the Southern Hemisphere. The combined impact of GRACE‐A and CHAMP is greater than assimilating either instrument individually.
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Healy et al. (2007) studied this question.
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