Articles | Volume 11, issue 4
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,, 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,, 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,, 2012.
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.