Bibliografie VÚGTK
Benchmark campaign and case study episode in central Europe fordevelopment and assessment of advanced GNSS troposphericmodels and products
Douša, Jan ; Dick, Galina ; Kačmařík, Michal ; Brožková, Radmila ; Zus, Florian ; Brenot, Hugues ; Stoycheva, Anastasia ; Möller, Gregor ; Kaplon, Jan

Source: Atmospheric Measurement Techniques : Sv. 9 (2016), č. 7, str. 2989–3008 ISSN: 1867-8548

Publication type: článek
Extent20 stran

Link: http://knihovna.vugtk.cz/record/193067/files/i2016-dousa-benchmark--amt-9-2989-2016.pdf
Fulltext: https://www.researchgate.net/publication/305331964_Benchmark_campaign_and_case_study_episode_in_central_Europe_for_development_and_assessment_of_advanced_GNSS_tropospheric_models_and_products

Annotation:
Initial objectives and design of the Benchmark campaign organized within the European COST Action ES1206 (2013–2017) are described in the paper. This campaign has aimed to support the development and validationof advanced Global Navigation Satellite System (GNSS) tropospheric products, in particular high-resolution and ultra-fast zenith total delays (ZTDs) and tropospheric gradientsderived from a dense permanent network. A complex dataset was collected for the 8-week period when several extreme heavy precipitation episodes occurred in central Europe which caused severe river floods in this area. An initial processing of data sets from GNSS products and numerical weather models (NWMs) provided independently esti-mated reference parameters – zenith tropospheric delays and tropospheric horizontal gradients. Their provision gave an overview about the product similarities and complementarities, and thus a potential for improvements of a synergy in their optimal exploitations in future. Reference GNSS and NWM results were intercompared and visually analysed using animated maps. ZTDs from two reference GNSS solutions compared to global ERA-Interim reanalysis resulted in accuracy at the 10 mm level in terms of the root meansquare (rms) with a negligible overall bias, comparisons to Global Forecast System (GFS) forecasts showed accuracy atthe 12 mm level with the overall bias of5 mm and, finally, comparisons to mesoscale ALADIN-CZ forecast resulted inaccuracy at the 8 mm level with a negligible total bias. The comparison of horizontal tropospheric gradients from GNSS and NWM data demonstrated a very good agreement among independent solutions with negligible biases and an accuracyof about 0.5 mm. Visual comparisons of maps of zenith wet delays and tropospheric horizontal gradients showed very promising results for future exploitations of advanced GNSS tropospheric products in meteorological applications, suchas severe weather event monitoring and weather now casting. The GNSS products revealed a capability of providingmore detailed structures in atmosphere than the state-of-the-art numerical weather models are able to capture. In an initial study on the contribution of hydrometeors (e.g. cloud water, ice or snow) to GNSS signal delays during severe weather, the effect reached up to 17 mm, and it was suggested that hydrometeors should be carefully accounted for within the functional model. The reference products will be further exploited in various specific studies using the Benchmark data set. It is thus going to play a key role in these highly interdisciplinary developments towards better mutual benefits from advanced GNSS and meteorological products.
Keywords: numerical weather prediction ; gps meteorology

Citation: DOUŠA, Jan, Hugues BRENOT, Radmila BROŽKOVÁ, et al. Benchmark campaign and case study episode in central Europe for development and assessment of advanced GNSS tropospheric models and products. Atmospheric Measurement Techniques. Spolková republika Německo, 2016, 9(7), 2989-3008. DOI: 10.5194/amt-9-2989-2016. ISSN 1867-1381. Dostupné také z: http://www.atmos-meas-tech.net/9/2989/2016/(Springer)
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