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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-2017-11
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Tropospheric products of the 2nd European reprocessing (1996–2014)
Jan Dousa and Pavel Vaclavovic NTIS - New Technologies for the Information Society, Geodetic Observatory Pecný, RIGTC 250 66 Zdiby, Czech Republic
Abstract. In this paper, we present results of the 2nd reprocessing of all data from 1996 to 2014 from all stations in the European GNSS permanent network as performed at the Geodetic Observatory Pecný (GOP). While the original goal of this research was to ultimately contribute to new realization of the European terrestrial reference system, we also aim to provide a new set of GNSS tropospheric parameter time series with possible applications to climate research. To achieve these goals, we enhanced a strategy to guarantee the continuity of these tropospheric parameters and we prepared several variants of troposphere modelling. We then assessed all solutions in terms of the repeatability of coordinates as an internal evaluation of applied models and strategies, and in terms of zenith tropospheric delays (ZTD) and horizontal gradients with those of ERA-Interim numerical weather model (NWM) reanalysis. When compared to the GOP Repro1 solution, the results of the GOP Repro2 yielded improvements of approximately 50 % and 25 % in the repeatability of the horizontal and vertical components, respectively, and of approximately 9 % in tropospheric parameters. Vertical repeatability was reduced from 4.14 mm to 3.73 mm when using the VMF1 mapping function, a priori ZHD, and non-tidal atmospheric loading corrections from actual weather data. Raising the elevation angle cut-off from 3° to 7° and then to 10° increased RMS from coordinates’ repeatability, which was then confirmed by independently assessing GNSS tropospheric parameters with the NWM reanalysis. The assessment of tropospheric horizontal gradients with respect to the ERA-Interim revealed a strong sensitivity of estimated gradients to the quality of GNSS antenna tracking performance. This impact was demonstrated at the Mallorca station, where gradients systematically grew up to 5 mm during the period between 2003 and 2008, before this behaviour disappeared when the antenna at the station was changed.

Citation: Dousa, J. and Vaclavovic, P.: Tropospheric products of the 2nd European reprocessing (1996–2014), Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-11, in review, 2017.
Jan Dousa and Pavel Vaclavovic
Jan Dousa and Pavel Vaclavovic
Jan Dousa and Pavel Vaclavovic

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Short summary
With the 2nd reprocessing of EUREF network (1996 to 2014) we produced GNSS tropospheric parameters for climate research. We prepared and evaluated seven solutions and enhanced a strategy for the continuity of tropospheric parameters. Compared with Repro1, the Repro2 yielded improvements of 50 % and 25 % in repeatability of horizontal and vertical coordinates and 9 % for tropospheric parameters. Tropospheric gradients revealed a high sensitivity to GNSS tracking demonstrated at Mallorca station.
With the 2nd reprocessing of EUREF network (1996 to 2014) we produced GNSS tropospheric...
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