Articles | Volume 9, issue 2
Research article
03 Feb 2016
Research article |  | 03 Feb 2016

Ionospheric correction of GPS radio occultation data in the troposphere

Z. Zeng, S. Sokolovskiy, W. Schreiner, D. Hunt, J. Lin, and Y.-H. Kuo

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Cited articles

Ao, C. O., Hajj, G. A., Meehan, T. K., Dong, D., Iijima, B. A., Mannucci, J. A., and Kursinski, E. R.: Rising and setting GPS occultations by use of open-loop tracking, J. Geophys. Res., 114, D04101,, 2009.
Gorbunov, M. E., Lauritsen, K. B., Rhodin, A., Tomassini, M, and Kornblueh, L.: Radio holographic filtering, error estimation and quality control of radio occultation data, J. Geophys. Res., 111, D10105,, 2006.
Hajj, G. A., Krusinski, E. R., Romans, L. J., Bertiger, W. I., and Leroy, S. S.: A technical description of atmospheric sounding by GPS occultation, J. Atmos. Sol.-Terr. Phy., 64, 451–469,, 2002.
Healy, S. B.: Radio occultation bending angle and impact parameter errors caused by horizontal refractive index gradients in the troposphere: A simulation study, J. Geophys. Res., 106, 11875–11889,, 2001.
Ho, S.-P., Peng, L., Anthes, R., Kuo, Y.-H., and Lin, H.-C.: Marine boundary layer heights and their longitudinal, diurnal and interseasonal variability in the Southeastern Pacific using COSMIC, CALIOP, and radiosonde data, J. Climate, 28, 2856–2872,, 2015.
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This study discusses the ionospheric correction problem of RO data in the troposphere and investigates an optimal transition height (OTH) for replacing the standard linear combination method by the L1–L2 bending angle extrapolated from above. By comparing the RO ionosphere-free bending angles with the ECMWF global forecast ones, the OTH is found when it gives the minimal standard deviations. The results show the OTH depends mainly on the L2 signal and is ~20 km for COSMIC L2P and ~10 km for L2C.