Comparison of different techniques for tropospheric wet delay retrieval over South America and surrounding oceans
| Autor: | G. Colosimo, M. V. Mackern, A. Calori, Mattia Crespi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
GNSS
Jason-1 radiometer Numerical weather model SIRGAS ZWD retrieval Computers in Earth Sciences Geophysics Radiometer Meteorology ZWD RETRIEVAL Center (category theory) Numerical weather prediction Standard deviation Ciencias de la Tierra y relacionadas con el Medio Ambiente Troposphere Geography GNSS applications Satellite JASON-1 RADIOMETER Meteorología y Ciencias Atmosféricas NUMERICAL WEATHER MODEL CIENCIAS NATURALES Y EXACTAS Zenith |
| Zdroj: | VIII Hotine-Marussi Symposium on Mathematical Geodesy ISBN: 9783319245485 |
| Popis: | Water vapour (WV) plays a fundamental role in several weather processes that deeply influence human activities. Satellite based radiometers, Ground based Global Navigation Satellite Systems (GNSS) and Numerical Weather Models (NWM) permit to obtain either measurements or estimates or forecasts of WV. This work presents a 2 years systematic comparison to address the agreement on the tropospheric wet delay retrieved by the three mentioned independent techniques over permanent stations belonging to SIRGAS (Sistema de Referencia para las Américas) GNSS network. SIRGAS tropospheric total delay estimations are compared with the official International GNSS Service (IGS) ones, with the measurements from the Jason-1 satellite radiometer (JMR) in terms of Zenith Wet Delays (ZWD) and, finally, with the ZWD computed from ERA Interim, the last reanalysis dataset from the European Center for Medium-Range Weather Forecasts (ECMWF). All the differences between the techniques, which were considered in order to yield a reliable comparison, are discussed. The statistical results of mean (μ), standard deviation (σ) and correlation (ρ), show that the highest agreement is reached between SIRGAS and IGS products (μ = –0.5mm, σ = 5.6mm, ρ = 0.98), whereas slightly worse values are obtained in the comparisons with the JMR measurements (μ = –7.4mm, σ = 15.4mm, ρ = 0.91), and the ERA Interim data (μ = –1.5mm, σ = 16.6mm, ρ = 0.91). Fil: Calori, Andrea Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo. Facultad de Ingeniería; Argentina Fil: Colosimo, G.. Università degli studi di Roma "La Sapienza"; Italia Fil: Crespi, M.. Università degli studi di Roma "La Sapienza"; Italia Fil: Mackern Oberti, María Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo. Facultad de Ingeniería; Argentina |
| Databáze: | OpenAIRE |
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