Morphology of atmospheric refraction index variations at different altitudes from GPS/MET satellite observations

Details Morphology of atmospheric refraction index variations at different altitudes from GPS/MET satellite observations Morphology of atmospheric refraction index variations at different altitudes from GPS/MET satellite observations

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..427g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 6-9, p. 427-435.

Physics

1

Gravity Waves, Middle Atmosphere, Climatology, Radio Wave Refraction, Gps Satellites

Scientific paper

The measurements from the low-orbit satellite GPS/MET in the atmosphere at 2-35km altitudes are used to obtain global distributions of mesoscale variances of the radio wave refraction index (as a measure of dry temperature). Individual refraction index and dry temperature profiles are smoothed using second order polynomial approximations within layers of 5-10km thickness centered at different altitudes. The refraction index deviations from the smoothed values and their variances are obtained for each profile and are averaged for each month of the year during the GPS/MET experiment during the years 1995-1997. Latitude-longitude and latitude-height distributions of the refraction index variances show inhomogeneous structures. Locations and latitude distributions of the maximum and minimum values of the variance depend on altitude and month of year. The reasons for the small- and mesoscale refraction index perturbations in the troposphere-stratosphere may be mesoscale turbulence and internal gravity waves. The magnitudes of the refraction index variances are larger in the regions of tropospheric jet streams and of equatorial deep convection.

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