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Chin. Phys. B, 2014, Vol. 23(6): 069202    DOI: 10.1088/1674-1056/23/6/069202

Impact of GNSS radio occultation bending angle data assimilation in YH4DVAR system

Zhu Meng-Bin, Zhang Wei-Min, Cao Xiao-Qun, Yu Yi
College of Computer, National University of Defense Technology, Changsha 410073, China
Abstract  Global Navigation Satellite System (GNSS) radio occultation measurements have been assimilated into the four-dimensional variational data assimilation system (YH4DVAR) using a one-dimensional bending angle operator (GBAO) as a new type of observation. For the sake of verifying the impact of GNSS radio occultation (RO) measurements to the data assimilation system, three experiments have been conducted. The statistical results of the analysis error experiment and forecast skill experiment show that the GNSS RO measurements have an impact on the analysis system. The typhoon forecast experiment shows the impact on the important weather process. They all have a positive impact on the weather forecast. Lastly, we look forward to future work on the observation system simulation experiment (OSSE) to investigate the impact of GNSS RO measurements as a function of observation number, which is an effective method to estimate the saturation of the observation number.
Keywords:  GNSS radio occultation      analysis field biases experiment      forecast skill experiment      typhoon forecast impact experiment     
Received:  09 September 2013      Published:  15 June 2014
PACS:  92.60.hv (Pressure, density, and temperature)  
  92.60.Wc (Weather analysis and prediction)  
  95.10.Gi (Eclipses, transits, and occultations)  
  04.20.Fy (Canonical formalism, Lagrangians, and variational principles)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 40775064, 41105063, and 41375113) and the Special Scientific Research Fund of Meteorological Public Welfare Profession of China (Grant Nos. GYHY201006015 and GYHY201206007).
Corresponding Authors:  Zhu Meng-Bin     E-mail:

Cite this article: 

Zhu Meng-Bin, Zhang Wei-Min, Cao Xiao-Qun, Yu Yi Impact of GNSS radio occultation bending angle data assimilation in YH4DVAR system 2014 Chin. Phys. B 23 069202

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