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Validation of Preliminary Results of Thermal Tropopause Derived from FY-3C GNOS Data

1,2,3,4, 1,2,3, 1,2,3,*, 1,2,3,4, 1,2,3,4, 5, 1,2,3, 1,2,3, 1,2,3,4, 1,2,3,4, 1,2,3, 1,2,3, 1,2,3 and 1,2,3
National Space Science Center, Chinese Academy of Sciences (NSSC/CAS), Beijing 100190, China
Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China
Joint Laboratory on Occultations for Atmosphere and Climate (JLOAC) of NSSC/CAS, Beijing 100190, China and University of Graz, 8010 Graz, Austria
University of Chinese Academy of Sciences, Beijing 100049, China
State Intellectual Property Office of the P.R.C, Beijing 100088, China
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(9), 1139;
Received: 15 April 2019 / Revised: 1 May 2019 / Accepted: 10 May 2019 / Published: 13 May 2019
PDF [4219 KB, uploaded 13 May 2019]


The state-of-art global navigation satellite system (GNSS) occultation sounder (GNOS) onboard the FengYun 3 series C satellite (FY-3C) has been in operation for more than five years. The accumulation of FY-3C GNOS atmospheric data makes it ready to be used in atmosphere and climate research fields. This work first introduces FY-3C GNOS into tropopause research and gives the error evaluation results of long-term FY-3C atmosphere profiles. We compare FY-3C results with Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) and radiosonde results and also present the FY-3C global seasonal tropopause patterns. The mean temperature deviation between FY-3C GNOS temperature profiles and COSMIC temperature profiles from January 2014 to December 2017 is globally less than 0.2 K, and the bias of tropopause height (TPH) and tropopause temperature (TPT) annual cycle derived from both collocated pairs are about 80–100 m and 1–2 K, respectively. Also, the correlation coefficients between FY-3C GNOS tropopause parameters and each radiosonde counterpart are generally larger than 0.9 and the corresponding regression coefficients are close to 1. Multiple climate phenomena shown in seasonal patterns coincide with results of other relevant studies. Our results demonstrate the long-term stability of FY-3C GNOS atmosphere profiles and utility of FY-3C GNOS data in the climate research field. View Full-Text
Keywords: FY-3C GNOS; radio occultation; tropopause parameters; validation FY-3C GNOS; radio occultation; tropopause parameters; validation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, Z.; Sun, Y.; Bai, W.; Xia, J.; Tan, G.; Cheng, C.; Du, Q.; Wang, X.; Zhao, D.; Tian, Y.; Meng, X.; Liu, C.; Cai, Y.; Wang, D. Validation of Preliminary Results of Thermal Tropopause Derived from FY-3C GNOS Data. Remote Sens. 2019, 11, 1139.

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