Articles | Volume 11, issue 4
https://doi.org/10.5194/amt-11-2051-2018
https://doi.org/10.5194/amt-11-2051-2018
Research article
 | 
11 Apr 2018
Research article |  | 11 Apr 2018

Evaluating the lower-tropospheric COSMIC GPS radio occultation sounding quality over the Arctic

Xiao Yu, Feiqin Xie, and Chi O. Ao

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Cited articles

Ao, C. O., Meehan, T. K., Hajj, G. A., Manucci, A. J., and Beyerle, G.: Lower troposphere refractivity bias in GPS occultation retrievals, J. Geophys. Res., 108, 4577, https://doi.org/10.1029/2002JD003216, 2003.
Ao, C. O., Hajj, G. A., Meehan, T. K., Dong, D., Iijima, B. A., Mannucci, A. J., and Kursinski, E. R.: Rising and setting GPS occupations by use of open-loop tracking, J. Geophys. Res.-Atmos., 114, 1–15, https://doi.org/10.1029/2008JD010483, 2009.
Ao, C. O., Waliser, D. E., Chan, S. K., Li, J. L., Tian, B., Xie, F., and Mannucci, A. J.: Planetary boundary layer heights from GPS radio occultation refractivity and humidity profiles, J. Geophys. Res.-Atmos., 117, 1–18, https://doi.org/10.1029/2012JD017598, 2012.
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Short summary
Atmospheric observations from GPS receiver satellites offer uniform spatial coverage over the Arctic. The GPS profiles sensing deep into the lowest 300 m of the atmosphere only reach 50–60 % in summer but over 70 % in other seasons. The profile uncertainty due to different data centers is within 0.07 % in refractivity, 0.72 K in temperature, and 0.05 g kg-1 in humidity below 10 km. A systematic negative bias of 1 % in refractivity below 2 km is only seen in the summer due to moisture impact.