Applications of Local Spectral Width on GPS RO Data Assimilation to Operational Typhoon Track Forecasts

Yu Chun Chen, Ming En Hsieh, Hui Liu, Ling Feng Hsiao, Lung Yao Chang, Ching Yuang Huang, Ying Hwa Kuo

Research output: Contribution to journalArticlepeer-review


Owing to the inhomogeneous distribution of water vapor in the lower troposphere, the multi-path propagation of radio waves from Global Positioning System (GPS) causes the divergent measurement from radio occultation. Hence, local spectral width (LSW) of wave optics transformed bending angles spectrum can be used to represent the uncertainty of radio occultation (RO) observation. In this study, the LSW is applied to a physically-based quality control of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) GPSRO refractivity data assimilated in the Typhoon Weather Research and Forecasting (TWRF) system, the regional operational model, at Central Weather Bureau (CWB) in Taiwan. The results show a track forecast improvement for a typhoon Sinlaku case initiated at 1800UTC 11 September in 2008. The results for the sequential cycling experiments of typhoons (Sinlaku, Hagupit, and Jangmi in September 2008) also imply the potential benefits of LSW-based GPSRO data QC on the typhoon track forecasts.

Original languageEnglish
Pages (from-to)415-428
Number of pages14
JournalJournal of Aeronautics, Astronautics and Aviation
Issue number4
StatePublished - 1 Dec 2018


  • GPS
  • Local spectral width
  • Radio occultation
  • Typhoon


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