Short Note: A global model of pressure and temperature for geodetic applications |
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| Authors: | J Boehm R Heinkelmann H Schuh |
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| Institution: | 1.Institute of Geodesy and Geophysics,Vienna University of Technology,Vienna,Austria |
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| Abstract: | The empirical model GPT (Global Pressure and Temperature), which is based on spherical harmonics up to degree and order nine,
provides pressure and temperature at any site in the vicinity of the Earth’s surface. It can be used for geodetic applications
such as the determination of a priori hydrostatic zenith delays, reference pressure values for atmospheric loading, or thermal
deformation of Very Long Baseline Interferometry (VLBI) radio telescopes. Input parameters of GPT are the station coordinates
and the day of the year, thus also allowing one to model the annual variations of the parameters. As an improvement compared
with previous models, it reproduces the large pressure anomaly over Antarctica, which can cause station height errors in the
analysis of space-geodetic data of up to 1 cm if not considered properly in troposphere modelling. First tests at selected
geodetic observing stations show that the pressure biases considerably decrease when using GPT instead of the very simple
approaches applied to various Global Navigation Satellite Systems (GNSS) software packages so far. GPT also provides an appropriate
model for the annual variability of global temperature.
Electronic supplementary material The online version of this article (doi: contains supplementary material, which is available to authorized users. |
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| Keywords: | GNSS VLBI Neutral atmosphere delays |
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