000193448 001__ 193448
000193448 005__ 20181127114100.0
000193448 041__ $$aeng
000193448 1001_ $$aDouša, Jan
000193448 24510 $$aTropospheric products of the second GOP European GNSS reprocessing (1996–2014)
000193448 300__ $$a9 stran
000193448 5203_ $$9eng$$aIn this paper, we present results of the second reprocessing of all data from 1996 to 2014 from all stations in International Association of Geodesy (IAG) Reference Frame Sub-Commission for Europe (EUREF) Permanent Network (EPN) as performed at the Geodetic Observatory Pecný (GOP). While the original goal of this research was to ultimately contribute to the realization of a new European Terrestrial Reference System (ETRS), we also aim to provide a new set of GNSS (Global Navigation Satellite System) tropospheric parameter time series with possible applications to climate research. To achieve these goals, we improved 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 (ZTDs) and horizontal gradients with those of the ERA-Interim numerical weather model (NWM) reanalysis. When compared to the GOP Repro1 (first EUREF reprocessing) solution, the results of the GOP Repro2 (second EUREF reprocessing) 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 to 3.73 mm when using the VMF1 mapping function, a priori ZHD (zenith hydrostatic delay), and non-tidal atmospheric loading corrections from actual weather data. Raising the elevation cut-off angle from 3 to 7° and then to 10° increased RMS from coordinates' repeatability, which was then confirmed by independently comparing 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. The impact of processing variants on long-term ZTD trend estimates was assessed at 172 EUREF stations with time series longer than 10 years. The most significant site-specific impact was due to the non-tidal atmospheric loading followed by the impact of changing the elevation cut-off angle from 3 to 10°. The other processing strategy had a very small or negligible impact on estimated trends.
000193448 655_4 $$aanotace
000193448 653_0 $$aGNSS
000193448 653_0 $$azenith total delays
000193448 653_0 $$atropospheric gradients
000193448 653_0 $$aclimatology
000193448 653_0 $$areanalysis
000193448 7001_ $$aVáclavovic, Pavel
000193448 7001_ $$aEliaš, Michal
000193448 7730_ $$92017$$g10(9), str. 3589-3607$$tAtmospheric Measurement Techniques$$x1867-1381
000193448 85642 $$uhttps://www.rvvi.cz/riv?s=jednoduche-vyhledavani&ss=detail&h=RIV%2F00025615%3A_____%2F17%3AN0000023%21RIV18-MSM-00025615
000193448 856__ $$uurn:doi:10.5194/amt-10-3589-2017
000193448 85640 $$uhttps://www.atmos-meas-tech.net/10/3589/2017/
000193448 980__ $$aclanky_vugtk
000193448 985__ $$aanotace
000193448 985__ $$ariv
000193448 985__ $$adousa
000193448 985__ $$avaclavovic
000193448 985__ $$aelias