Preprints
https://doi.org/10.5194/amt-2020-440
https://doi.org/10.5194/amt-2020-440

  08 Dec 2020

08 Dec 2020

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Statistical analyzing the effect of ionospheric irregularity on GNSS radio occultation atmospheric measurement

Mingzhe Li1,2,3,4 and Xinan Yue1,2,3,4 Mingzhe Li and Xinan Yue
  • 1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
  • 2Innovation Academy for Earth Science, CAS, Beijing, China
  • 3Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
  • 4College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

Abstract. The Global Navigation Satellite System (GNSS) atmospheric radio occultation (RO) has been an effective method for Earth’s atmosphere exploring. RO signals propagate through ionosphere before reaching the neutral atmosphere. The GNSS signal is affected by the ionospheric irregularity including the sporadic E (Es) and the F region irregularity due to mainly multipath effect. The effect of ionospheric irregularity on atmospheric RO data has been demonstrated by several studies in terms of cases. However, its statistical effect has not been investigated comprehensively. In this study, based on the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) RO data during 2011–2013, the failed inverted RO events occurrence rate and the bending angle oscillation, which is defined as the standard deviation of the bias between the observed bending angle and the National Center for Atmospheric Research (NCAR) climatology model bending angle between 60 and 80 km, were used for statistical analysis. It is found that in middle and low latitudes during the daytime, the failed inverted RO occurrence and the bending angle oscillation show obvious latitude, longitude, and local time variations, which correspond well with the Es occurrence features. The F region irregularity (FI) contributes to the obvious increase of the failed inverted RO occurrence rate and the bending angle oscillation value during the nighttime over the geomagnetic equatorial regions. For high latitude regions, the Es can increase the failed inverted RO occurrence rate and the bending angle oscillation value during the nighttime. There also exists the seasonal dependency of the failed inverted RO event and the bending angle oscillation. Overall, the ionospheric irregularity effects on GNSS atmospheric RO measurement exist in terms of failed RO event inversion and bending angle oscillation statistically. Awareness of these effects could benefit both the data retrieval and applications of RO in the lower atmosphere.

Mingzhe Li and Xinan Yue

 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Mingzhe Li and Xinan Yue

Mingzhe Li and Xinan Yue

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Short summary
In this study, we have analyzed the correlation between the ionospheric irregularity and the quality of the GNSS atmospheric radio occultation (RO) products statistically. Results show that the ionospheric irregularity could affect the GNSS atmospheric RO in terms of causing failed inverted RO events and the bending angle oscillation. Awareness of the ionospheric irregularity effect on RO could be beneficial to improve the RO data quality for weather and climate research.