Assimilation experiments with CHAMP GPS radio occultation measurements

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An overview of the variational assimilation in the ALADIN/France numerical weather‐prediction system (2005, methodology): “Surface screen-level observations, higher-density ATOVS data from several sounders, GPS zenithal delay measured from ground stations (Healy and Thépaut 2006) and QuikSCAT scatterometer winds (Stoffelen and Anderson 1997; Isaksen and Janssen 2004) will all contribute to increase the volume of…”
The COSMIC/FORMOSAT-3 Mission: Early Results (2008, methodology): “…are testing the impact of COSMIC data on operational NWP. ECMWF performed a data impact study by assimilating the COSMIC GPS RO bending angle profiles into the ECMWF operational NWP system from 14 September to 25 November 2006, using the observation operator described by Healy and Thépaut (2006).”
Exploring earth's atmosphere with radio occultation: contributions to weather, climate and space weather (2011, unknown): “For numerical weather prediction (NWP), either refractivities or bending angles can be assimilated directly in the models, thereby contributing valuable information on both the temperature and water vapor ﬁelds simultaneously (Healy et al., 2005; Healy and Th´epaut, 2006; Chen et al., 2009).”