Comparative and Quality Analysis of Radio Occultation Data from FY-3E/GNOS and COSMIC-2 

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  • 1. Joint Center for Data Assimilation Research and ApplicationNanjing University of Information Science and TechnologyNanjing 210044JiangsuChina
    2. College of Atmospheric ScienceNanjing University of Information Science and TechnologyNanjing 210044JiangsuChina

Online published: 2025-06-04

Abstract

Radio Occultation data are of great value in numerical weather forecasting and climate monitoring. This study evaluates the deviation characteristics of occultation data from the FY-3E/GNOS and COSMIC-2 satellites with ERA5 reanalysis data. The results indicate that FY-3E/GNOS and COSMIC-2 exhibit high consistency with ERA5 in the altitude range of 5 km to 30 kmwith refractivity deviations less than 1% and bending angle deviation is stable within ±0. 4%. Howeverin the lower atmospherebelow 5 km),COSMIC-2 presents a maximum negative bias of -1. 2% at altitudes below 4 kmwhile FY-3E/GNOS demonstrates a systematic positive bi‐ as below 5 km in the bending angleand the refractivity shows negative deviations below 2 km in the low-latitude region and positive deviations from 2 to 4 km. Research findings indicate that the bending angle profiles of FY-3E/GNOS are smoother than those of COSMIC-2especially in the lower troposphere.

Cite this article

WANG Shihan, YANG Shengpeng, YIN Yan’an . Comparative and Quality Analysis of Radio Occultation Data from FY-3E/GNOS and COSMIC-2 [J]. Plateau Meteorology, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00020

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