Troposphere delays from space geodetic techniques, water vapor radiometers, and numerical weather models over a series of continuous VLBI campaigns
Journal article, 2013

Continuous, very long baseline interferometry (VLBI) campaigns over 2 weeks have been carried out repeatedly, i.e., CONT02 in October 2002, CONT05 in September 2005, CONT08 in August 2008, and CONT11 in September 2011, to demonstrate the highest accuracy the current VLBI was capable at that time. In this study, we have compared zenith total delays (ZTD) and troposphere gradients as consistently estimated from the observations of VLBI, Global Navigation Satellite Systems (GNSS), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) at VLBI sites participating in the CONT campaigns. We analyzed the CONT campaigns using the state-of-the-art software following common processing strategies as closely as possible. In parallel, ZTD and gradients were derived from numerical weather models, i.e., from the global European Centre for Medium-Range Weather Forecasts (ECMWF) analysis fields, the High Resolution Limited Area Model (European sites), the Japan Meteorological Agency-Operational Meso-Analysis Field (MANAL, over Japan), and the Cloud Resolving Storm Simulator (Tsukuba, Japan). Finally, zenith wet delays were estimated from the observations of water vapor radiometers (WVR) at sites where the WVR observables are available during the CONT sessions. The best ZTD agreement, interpreted as the smallest standard deviation, was found between GNSS and VLBI techniques to be about 5-6 mm at most of the co-located sites and CONT campaigns. We did not detect any significant improvement in the ZTD agreement between various techniques over time, except for DORIS and MANAL. On the other hand, the agreement and thus the accuracy of the troposphere parameters mainly depend on the amount of humidity in the atmosphere. © 2013 Springer-Verlag Berlin Heidelberg.

Water vapor radiometers

Troposphere delays

Space geodetic techniques

Numerical weather models


K. Teke

Hacettepe University

Vienna University of Technology

T. Nilsson

German Research Centre for Geosciences (GFZ)

Johannes Böhm

Vienna University of Technology

Thomas Hobiger

Japan National Institute of Information and Communications Technology

P. Steigenberger

Technical University of Munich

Susana García Espada

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

Rüdiger Haas

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

P. Willis

Institut National de l'Information Géographique et Forestière

Paris Diderot University

Journal of Geodesy

0949-7714 (ISSN) 1432-1394 (eISSN)

Vol. 87 10-12 981-1001

Driving Forces

Sustainable development


Basic sciences


Onsala Space Observatory

Subject Categories

Earth and Related Environmental Sciences




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