INVESTIGADORES
GENDE Mauricio Alfredo
capítulos de libros
Título:
Zenith Wet Delay Retrieval Using Two Different Techniques for the South American Region and Their Comparison
Autor/es:
CALORI, A.; COLOSIMO, G.; CRESPI, M.; AZPILICUETA, F.; GENDE, M.; BRUNINI, C.; MACKERN, M.V.
Libro:
Earth on the Edge: Science for a Sustainable Planet
Editorial:
Springer
Referencias:
Año: 2014; p. 59 - 64
Resumen:
Retrieving atmospheric water vapor content using GNSS claimed the attention of the
geodetic community ever since the beginning of the GPS deployment. The main purpose
of the present work is to propose a comparison of the ZenithWet Delay (ZWD) retrieved by
GPS with the direct measurements provided by the water vapor radiometer loaded on-board
the Jason-1 altimetry satellite and those obtained from SIRGAS (Geocentric Reference
System for the Americas) GNSS reference stations. In this respect, the work proposes
a methodology for the comparison and contributes to assess the capabilities of SIRGAS
permanent network to provide water vapor informations that can be useful both for shortterm
weather forecasting and for long-term climate studies. For the period from June
2008 to June 2010 the tropospheric parameters of more than 100 SIRGAS stations were
estimated using Bernese 5.0 software with a time interval of 15min. Since Jason-1 returns
reliable measurements only over open ocean areas, a subset of 14 stations located along
the coastline was selected for the comparison. A dedicated software was developed in order
to effectively manage the huge amount of Jason-1 data, mainly devoted to data selection
according to site position, time interval and data filtering using quality flag indicators. The
Zenith Hydrostatic Delay (ZHD) provided by the European Center for Medium Weather
Forecasting (ECMWF) were first corrected up to the GPS station height and then used to
derive the ZWDfrom the GPS estimated Zenith Total Delay (ZTD). The agreement between
the techniques was evaluated in terms of bias and standard deviation of the differences
(i.e. GPSZWDJason-1ZWD) resulting in 7.4mm and 15.4mm, respectively. The average
correlation coefficient is 0.93.