Item

Abstract

This report presents a further investigation of the capabilities of the satellite radio-
occultation system for monitoring of the Earth’s atmosphere (started at Report No.119).
Refractometric sounding of the Earth’s atmosphere using a multi-orbit satellite system
close to real GPS-LEO satellite system is simulated using data from the ECHAM3 (T106)
model. The direct model of the refraction measurements and its linearization, which are
necessary for assimilation of refractometric data, are formulated. Computational simula-
tions of pressure and temperature retrieval from the refractometric data, including usage
of the “first guess” of the meteorological fields, are performed. A method of retrieval of
the tropospheric humidity from the radio-occultation data, using the T106 model fields is
considered. The problems of processing of the satellite phase observation data, and iono-
spheric correction is also discussed. A special attention is dedicated to investigation of the
residual ionospheric errors and to methods of their reduction. Statistical characteristics of
the super-refraction in the boundary layer are estimated.