An assessment of reprocessed GPS/MET observations spanning 1995–1997

Abstract. We have performed an analysis of reprocessed GPS/MET data spanning 1995–1997 generated by the COSMIC Data Analysis and Archive Center (CDAAC) in 2007. CDAAC developed modified dual-frequency processing methods for encrypted (anti-spoofing (AS)-on) during 1995–1997. compared set to Modern-Era Retrospective Research Applications-2 (MERRA-2) reanalysis, separately AS-on AS-off, focusing on altitude range 10–30 km. MERRA-2 did not assimilate period To gain insight into set, we a single-frequency GPS/MET, which is unaffected presence encryption. find excellent agreement between more limited set: bias these two sets consistently less than 0.25 % refractivity, whether or AS on. Given different techniques applied new presented here (designated JPL), suggests that are biased aggregate sense greater corresponds approximately temperature 0.5 K. Since profiles contained subset profiles, combination consisting 9579 4729 yields total number 11 531 unique from combining JPL sets. All numbers after quality control has been respective activities.