NDLI: Troposphere gradients from the ECMWF in VLBI analysis

Content Provider	Springer Nature Link
Author	Boehm, Johannes Schuh, Harald
Copyright Year	2007
Abstract	Modeling path delays in the neutral atmosphere for the analysis of Very Long Baseline Interferometry (VLBI) observations has been improved significantly in recent years by the use of elevation-dependent mapping functions based on data from numerical weather models. In this paper, we present a fast way of extracting both, hydrostatic and wet, linear horizontal gradients for the troposphere from data of the European Centre for Medium-range Weather Forecasts (ECMWF) model, as it is realized at the Vienna University of Technology on a routine basis for all stations of the International GNSS (Global Navigation Satellite Systems) Service (IGS) and International VLBI Service for Geodesy and Astrometry (IVS) stations. This approach only uses information about the refractivity gradients at the site vertical, but no information from the line-of-sight. VLBI analysis of the CONT02 and CONT05 campaigns, as well as all IVS-R1 and IVS-R4 sessions in the first half of 2006, shows that fixing these a priori gradients improves the repeatability for 74% (40 out of 54) of the VLBI baseline lengths compared to fixing zero or constant a priori gradients, and improves the repeatability for the majority of baselines compared to estimating 24-h offsets for the gradients. Only if 6-h offsets are estimated, the baseline length repeatabilities significantly improve, no matter which a priori gradients are used.
Starting Page	403
Ending Page	408
Page Count	6
File Format	PDF
ISSN	09497714
Journal	Journal of Geodesy
Volume Number	81
Issue Number	6-8
e-ISSN	14321394
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-03-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Troposphere modeling Troposphere gradients VLBI ECMWF Math. Applications in Geosciences Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology Computers in Earth Sciences

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Combination of long time-series of troposphere zenith delays observed by VLBI

Comparisons of homogeneously reprocessed GPS and VLBI long time-series of troposphere zenith delays and gradients

Effect of different tropospheric mapping functions on the TRF, CRF and position time-series estimated from VLBI

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