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Volume 52 Supplement 11

Special Issue: Application of GPS and other space geodetic techniques to Earth Sciences (2)

Sensing atmospheric structure: Tropospheric tomographic results of the small-scale GPS campaign at the Onsala Space Observatory


Tropospheric tomography using data from local networks of Global Positioning System (GPS) receivers is producing encouraging spatio-temporal representations of the wet refractivity field. In this work we present the results from a small-scale geodetic experiment that we carried out at the Onsala Space Observatory. Seven GPS receivers distributed within a radius of 3 km from the center, were deployed during 21 days in the summer 1998. The limited number of sites and their spatial configuration present a challenge for tropospheric tomography. Using novel GPS techniques to determine the vertical structure of the atmosphere, we observed, for one session, a strong horizontal water-vapor gradient with a leading edge at higher altitude than the trailing edge, entering from the north. The vertical structure obtained independently using tomographic techniques matched such situation. These results suggest tomography is a promising technique for the determination of the spatio-temporal structure of the atmosphere. We will present preliminary results of the tropospheric tomography, using simulations and experimental data, together with some comparisons with radiosonde data.


  • Bar-Sever, Y. E., P. M. Kroger, and J. A. Borjesson, Estimating horizontal gradients of tropospheric path delay with a single GPS receiver, J. Geophys. Res., 103, 5019–5035, 1998.

    Article  Google Scholar 

  • Bevis, M., S. Businger, T. A. Herring, C. Rocken, R. A. Anthes, and R. Ware, GPS meteorology: Remote sensing of atmospheric water vapor using the global positioning system, J. Geophys. Res., 97(D14), 15787–15801, 1992.

    Article  Google Scholar 

  • Davis, J. L., G. Elgered, A. E. Niell, and C. E. Kuehn, Ground-based measurement of gradients in the wet radio refractivity of air, Radio Sci., 28(6), 1003–1038, 1993.

    Article  Google Scholar 

  • Elgered, G., J. L. Davis, T. A. Herring, and I. I. Shapiro, Geodesy by radio interferometry: Water vapor radiometry for estimation of the wet delay, J. Geophys. Res., 96(B4), 6541–6555, 1991.

    Article  Google Scholar 

  • Elósegui, P., J. L. Davis, L. P. Gradinarsky, G. Elgered, J. M. Johansson, D. A. Tahmoush, and A. Rius Sensing atmospheric structure using small-scale space geodetic networks, Geophys. Res. Lett., 26, 2445-2448,1999.

    Article  Google Scholar 

  • Flores, A., Local tropospheric tomography software (LOTTOS) documentation, Technical report, IEEC, 1999.

    Google Scholar 

  • Flores, A., G. Ruffini, and A. Rius, 4D tropospheric tomography using GPS slant wet delays, Annales Geophysicae, 18, 223–234, 2000.

    Article  Google Scholar 

  • Herring, T. A., J. L. Davis, and I. I. Shapiro, Geodesy by radio interferometry: The application of kalman filtering to the analysis of very long baseline interferometry data, J. Geophys. Res., 95(B8), 12561–12581, 1990.

    Article  Google Scholar 

  • Houghton, J. T., The Physics of Atmospheres, 203 pp., Cambridge University Press, 1977.

    Google Scholar 

  • Kursinski, E. R., The GPS Radio Occultation Concept: Theoretical Performance and Initial Results, Ph.D. thesis, California Institute of Technology, 288 pp., 1997.

    Google Scholar 

  • Press, W. H., S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipes in Fortran. The Art of Scientific Computing, 961 pp., Cambridge university Press, second edition, 1992.

  • Ruffini, G., A. Flores, and A. Rius, GPS tomography of the ionospheric electron content with a correlation functional, IEEE Transactions on Geoscience and Remote Sensing, 36 (1), 1998.

  • Ruffini, G., L. P. Kruse, A. Rius, B. Bürki, L. Cucurull, and A. Flores, Estimation of tropospheric zenith delay and gradients over the Madrid area using GPS and WVR data, Geophys. Res. Lett., 26(4), 447–450, 1999.

    Article  Google Scholar 

  • Thayer, G. D., An improved equation for the radio refractive index of air, Radio Sci., 9(10), 803–807, 1974.

    Article  Google Scholar 

  • Webb, F. H. and J. F. Zumberge, An Introduction to GIPSY-OASIS II, Jet Propulsion Laboratory, California Institute of Technology, 1997.

    Google Scholar 

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Correspondence to A. Flores.

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Flores, A., Gradinarsky, L.P., Elósegui, P. et al. Sensing atmospheric structure: Tropospheric tomographic results of the small-scale GPS campaign at the Onsala Space Observatory. Earth Planet Sp 52, 941–945 (2000).

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  • Global Position System
  • Global Position System Receiver
  • Radiosonde Data
  • Zenith Delay
  • Atmospheric Structure