Lower troposphere refractivity bias in GPS occultation retrievals

By Chi O. Ao, T. Meehan, George Hajj, Anthony J. Mannucci, Georg Beyerle. 2003

183 citations recorded by the source corpus.

Subfields: Aerospace Engineering, Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/fc0c42050efdb086dc35d11114767da0dbff0add

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Citations in the corpus

Inversion and error estimation of GPS radio occultation Data (2004, methodology): “Comparisons of GPS/MET data with models and other correlative data indicated that the GPS/MET soundings possess the equivalent temperature accuracy of@1 K in the range from the lower troposphere to 40 km (Ware et al. 1996; Kursinski et al. 1996; Rocken et al. 1997) as well as a geopotential height a”
Comparison of GPS radio occultation soundings with radiosondes (2005, background): “This is attributed to the well-known negative refractivity bias associated RO soundings in the tropical lower troposphere [Rocken et al., 1997; Sokolovskiy, 2003; Ao et al., 2003], as a similar bias can be found in the RO and ECMWF comparison.”
CHAMP and SAC-C atmospheric occultation results and intercomparisons (2004, methodology): “Both of these solutions, which are currently being implemented for the COSMIC program and tested on the CHAMP and SAC-C flight receivers, will reduce the N-bias to less than 1%. This remaining bias is caused by atmospheric ducting [Sokolovskiy, 2001a, 2003; Ao et al., 2003 ]; methods for reducing i”
COSMIC‐2 Radio Occultation Constellation: First Results (2020, background): “…biases below 2 km. RO biases in the lower troposphere are known to be caused by a combination of different factors: SR (affects refractivity; Ao et al., 2003; Ao, 2007; Sokolovskiy, 2003; Xie et al., 2006; Xie et al., 2010), tracking depth and noise (Sokolovskiy, 2003; Sokolovskiy et al.,…”
The COSMIC/FORMOSAT-3 Mission: Early Results (2008, background): “Possible reasons for the negative N bias are i) tracking errors under low SNR (Ao et al. 2003; Beyerle et al. 2006), ii) the presence of superrefraction induced by strong refractivity gradients on top of the ABL (Sokolovskiy 2003; Ao et al. 2003; Xie et al. 2006), iii) an insufficient tracking…”
Exploring earth's atmosphere with radio occultation: contributions to weather, climate and space weather (2011, unknown): “The mean difference is shown by the red line and the standard deviation of the differences by the solid blue lines (Ho et al., 2010a). vich, 1998a,b; Gorbunov and Kornblueh, 2001; Ao et al., 2003; Sokolovskiy, 2001, 2003; Beyerle et al., 2004, 2006 and Wickert et al., 2004.”
The Radio Occultation Experiment aboard CHAMP: Operational Data Analysis and Validation of Vertical Atmospheric Profiles (2004, methodology): “…retrieval method (CTss, Beyerle et al., 2003b) based on the Canonical Transform (CT) technique (e.g. Gorbunov, 2002) and the sliding spectral (ss) approach (Sokolovskiy, 2001) is found to reduce the lower tropospheric refractivity bias (e.g. Ao et al., 2003) by more than a factor of two (see Chap.”
Assimilation of Global Positioning System radio occultation data in the ECMWF ERA–Interim reanalysis (2010, methodology): “The geometrical optics method, which has so far been applied to process MetOp-A GRAS data, has indeed been shown to cause biases in the troposphere with CHAMP data (Ao et al., 2003).”
Forecast impact experiment with GPS radio occultation measurements (2005, background): “This problem is an area of active research [Ao et al., 2003], but we do not currently have a good understanding of the statistical”