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Volume 9, issue 2
Atmos. Meas. Tech., 9, 781-792, 2016
https://doi.org/10.5194/amt-9-781-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 9, 781-792, 2016
https://doi.org/10.5194/amt-9-781-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 02 Mar 2016

Research article | 02 Mar 2016

Preliminary validation of the refractivity from the new radio occultation sounder GNOS/FY-3C

Mi Liao1,2,3, Peng Zhang3, Guang-Lin Yang3, Yan-Meng Bi3, Yan Liu2, Wei-Hua Bai4, Xiang-Guang Meng4, Qi-Fei Du4, and Yue-Qiang Sun4 Mi Liao et al.
  • 1Nanjing University of Information Science & Technology, Nanjing, China
  • 2Chinese Academy of Meteorological Sciences, Beijing, China
  • 3National Satellite Meteorological Center, Beijing, China
  • 4Center for Space Science and Applied Research, Beijing, China

Abstract. As a new member of the space-based radio occultation sounders, the GNOS (Global Navigation Satellite System Occultation Sounder) mounted on Fengyun-3C (FY-3C) has been carrying out atmospheric sounding since 23 September 2013. GNOS takes approximately 800 daily measurements using GPS (Global Positioning System) and Chinese BDS (BeiDou navigation satellite) signals. In this work, the atmospheric refractivity profiles from GNOS were compared with the ones obtained from the co-located ECMWF (European Centre for Medium-Range Weather Forecasts) reanalysis. The mean bias of the refractivity obtained through GNOS GPS (BDS) was found to be approximately −0.09 % (−0.04 %) from the near surface to up to 46 km. While the average standard deviation was approximately 1.81 % (1.26  %), it was as low as 0.75 % (0.53 %) in the range of 5–25 km, where best sounding results are usually achieved. Further, COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) and MetOp/ GRAS (GNSS Receiver for Atmospheric Sounding) radio occultation data were compared with the ECMWF reanalysis; the results thus obtained could be used as reference data for GNOS. Our results showed that GNOS/FY-3C meets the design requirements in terms of accuracy and precision of the sounder. It possesses a sounding capability similar to COSMIC and MetOp/GRAS in the vertical range of 0–30 km, though it needs further improvement above 30 km. Overall, it provides a new data source for the global numerical weather prediction (NWP) community.

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This paper provides a preliminary validation for the refractivity of GNOS, a new addition to the space-based radio occultation sounder on FY-3C. It possesses a similar sounding capability that COSMIC and GRAS did in the vertical range of 0-30 km, with a precision below 1 %.
This paper provides a preliminary validation for the refractivity of GNOS, a new addition to the...
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