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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-372
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 Jan 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Inter-technique validation of tropospheric slant total delays
Michal Kačmařík1, Jan Douša2, Galina Dick3, Florian Zus3, Hugues Brenot4, Gregor Möller5, Eric Pottiaux6, Jan Kapłon7, Pawel Hordyniec7, Pavel Václavovic2, and Laurent Morel8 1Institute of Geoinformatics, VŠB – Technical University of Ostrava, Ostrava, the Czech Republic
2Geodetic Observatory Pecný, Research Institute of Geodesy, Topography and Cartography, Zdiby, the Czech Republic
3Helmholtz Centre Potsdam – GFZ German Research Centre for Geosciences, Potsdam, Germany
4Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
5Department of Geodesy and Geoinformation, Vienna University of Technology, Vienna, Austria
6Royal Observatory of Belgium, Brussels, Belgium
7Institute of Geodesy and Geoinformatics, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland
8GeF Laboratory, ESGT – CNAM, Le Mans, France
Abstract. An extensive validation of line-of-sight tropospheric Slant Total Delays (STD) from Global Navigation Satellite Systems (GNSS), ray-tracing in Numerical Weather Prediction Models (NWM) fields and microwave Water Vapour Radiometer (WVR) is presented. Ten GNSS reference stations and almost two months of data from 2013, including severe weather events, entered the comparison. Seven institutions delivered their STDs based on GNSS observations processed using five software and eleven strategies. STDs from NWM ray-tracing came from three institutions using three different NWM models. Results show generally a very good mutual agreement among all solutions from all the techniques. The mean bias (over all stations) between the GNSS solution selected as reference, which did not use post-fit residuals in STDs, and all other GNSS solutions without post-fit residuals is −0.6 mm for STDs scaled in the zenith direction, and the corresponding mean standard deviation is 3.7 mm. Standard deviations of comparisons between GNSS a NWM ray-tracing solutions are typically 10 mm ± 2 mm (scaled in the zenith direction), depending on the NWM model and the particular station considered. When comparing GNSS versus WVR STDs, standard deviations reached 12 mm ± 2 mm, as scaled in zenith direction. Moreover, the influence of adding raw GNSS post-fit residuals, as well as residuals screened out of systematic effects, to STDs was studied. It was found that adding raw post-fit residuals always led to lower quality of GNSS STDs while the situation was not that straightforward after the post-fit residuals cleaning.

Citation: Kačmařík, M., Douša, J., Dick, G., Zus, F., Brenot, H., Möller, G., Pottiaux, E., Kapłon, J., Hordyniec, P., Václavovic, P., and Morel, L.: Inter-technique validation of tropospheric slant total delays, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-372, in review, 2017.
Michal Kačmařík et al.
Michal Kačmařík et al.
Michal Kačmařík et al.

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