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Open AccessArticle

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

by Ziyan Liu 1,2,3,4, Yueqiang Sun 1,2,3, Weihua Bai 1,2,3,*, Junming Xia 1,2,3,4, Guangyuan Tan 1,2,3,4, Cheng Cheng 5, Qifei Du 1,2,3, Xianyi Wang 1,2,3, Danyang Zhao 1,2,3,4, Yusen Tian 1,2,3,4, Xiangguang Meng 1,2,3, Congliang Liu 1,2,3, Yuerong Cai 1,2,3 and Dongwei Wang 1,2,3
1
National Space Science Center, Chinese Academy of Sciences (NSSC/CAS), Beijing 100190, China
2
Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China
3
Joint Laboratory on Occultations for Atmosphere and Climate (JLOAC) of NSSC/CAS, Beijing 100190, China and University of Graz, 8010 Graz, Austria
4
University of Chinese Academy of Sciences, Beijing 100049, China
5
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; https://doi.org/10.3390/rs11091139
Received: 15 April 2019 / Revised: 1 May 2019 / Accepted: 10 May 2019 / Published: 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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MDPI and ACS Style

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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