Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies

Atmospheric water vapour has been acknowledged as an essential climate variable. Weather prediction and hazard assessment systems benefit from real-time observations, whereas long-term records contribute to climate studies. Nowadays, ground-based global navigation satellite system (GNSS) products ha...

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Autores principales: Bianchi, Clara Eugenia, Mendoza, Luciano Pedro Oscar, Fernández, Laura Isabel, Natali, María Paula, Meza, Amalia Margarita, Moirano, Juan Francisco
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
GNSS
Clima
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86765
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86765
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
GNSS
Clima
spellingShingle Ciencias Astronómicas
GNSS
Clima
Bianchi, Clara Eugenia
Mendoza, Luciano Pedro Oscar
Fernández, Laura Isabel
Natali, María Paula
Meza, Amalia Margarita
Moirano, Juan Francisco
Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
topic_facet Ciencias Astronómicas
GNSS
Clima
description Atmospheric water vapour has been acknowledged as an essential climate variable. Weather prediction and hazard assessment systems benefit from real-time observations, whereas long-term records contribute to climate studies. Nowadays, ground-based global navigation satellite system (GNSS) products have become widely employed, complementing satellite observations over the oceans. Although the past decade has seen a significant development of the GNSS infrastructure in Central and South America, its potential for atmospheric water vapour monitoring has not been fully exploited. With this in mind, we have performed a regional, 7-year-long and homogeneous analysis, comprising 136 GNSS tracking stations, obtaining high-rate and continuous observations of column-integrated water vapour and troposphere zenith total delay. As a preliminary application for this data set, we have estimated local water vapour trends, their significance, and their relation with specific climate regimes. We have found evidence of drying at temperate regions in South America, at a rate of about 2 % per decade, while a slow moistening of the troposphere over tropical regions is also weakly suggested by our results. Furthermore, we have assessed the regional performance of the empirical model GPT2w to blindly estimate troposphere delays. The model reproduces the observed mean delays fairly well, including their annual and semi-annual variations. Nevertheless, a long-term evaluation has shown systematical biases, up to 20 mm, probably inherited from the underlying atmospheric reanalysis. Additionally, the complete data set has been made openly available as supplementary material.
format Articulo
Articulo
author Bianchi, Clara Eugenia
Mendoza, Luciano Pedro Oscar
Fernández, Laura Isabel
Natali, María Paula
Meza, Amalia Margarita
Moirano, Juan Francisco
author_facet Bianchi, Clara Eugenia
Mendoza, Luciano Pedro Oscar
Fernández, Laura Isabel
Natali, María Paula
Meza, Amalia Margarita
Moirano, Juan Francisco
author_sort Bianchi, Clara Eugenia
title Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
title_short Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
title_full Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
title_fullStr Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
title_full_unstemmed Multi-year GNSS monitoring of atmospheric IWV over Central and South America for climate studies
title_sort multi-year gnss monitoring of atmospheric iwv over central and south america for climate studies
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86765
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