Go to:
Logótipo
Comuta visibilidade da coluna esquerda
Você está em: Start > Publications > View > Tropospheric delays from GNSS for application in coastal altimetry
Publication

Publications

Tropospheric delays from GNSS for application in coastal altimetry

Title
Tropospheric delays from GNSS for application in coastal altimetry
Type
Article in International Scientific Journal
Year
2013
Authors
Joana Fernandes, MJ
(Author)
FCUP
View Personal Page You do not have permissions to view the institutional email. Search for Participant Publications View Authenticus page View ORCID page
Nelson Pires
(Author)
Other
The person does not belong to the institution. The person does not belong to the institution. The person does not belong to the institution. Without AUTHENTICUS Without ORCID
Clara Lazaro
(Author)
FCUP
View Personal Page You do not have permissions to view the institutional email. Search for Participant Publications View Authenticus page View ORCID page
Alexandra L Nunes
(Author)
Other
The person does not belong to the institution. The person does not belong to the institution. The person does not belong to the institution. Without AUTHENTICUS Without ORCID
Journal
Vol. 51
Pages: 1352-1368
ISSN: 0273-1177
Publisher: Elsevier
Scientific classification
FOS: Natural sciences > Physical sciences
Other information
Authenticus ID: P-005-1JN
Abstract (EN): In the scope of the development of an improved methodology for the computation of the wet tropospheric correction for coastal altimetry, based on the use of tropospheric delays derived from GNSS (Global Navigation Satellite Systems), various studies have been conducted aiming to improve the estimation, at global scale, of GNSS-derived tropospheric delays. Amongst these studies, two are presented in this paper: (1) a global assessment of zenith total delays (ZTD) determined at international data centres such as EPN (EUREF Permanent Network) and IGS (International GNSS Service) by comparison with ZTD solutions computed at the University of Porto (U.Porto) using state-of-the-art methodologies and ZTD estimated from ERA Interim, the latest reanalysis dataset from ECMWF (European Centre for Medium-Range Weather Forecasts), (2) evaluation of the accuracy of the hydrostatic component of the tropospheric delay (zenith hydrostatic delay, ZHD) estimation from different sources of surface pressure. When compared with ERA Interim, both IGS and U.Porto ZTD are homogeneous with a mean standard deviation of the differences, for all analysed sites, of 12 mm. The U.Porto and IGS ZTD agree within 4 mm (1 sigma), while for EPN the same result is only valid for the period after November 2006. Before that date, the EPN solutions are slightly degraded and require an adequate correction. Aiming to evaluate the accuracy of ZHD determination from various sources of atmospheric pressure, a study is presented that compares ZHD values determined with in situ measurements of surface pressure at a global set of 63 coastal barometric sites (GNSS stations), the corresponding values obtained from ECMWF operational model, ERA Interim sea level pressure (SLP) and ZHD from the Vienna Mapping Functions 1 (VMF1). Results show that the global grids of sea level pressure provided by ECMWF operational model, either at 0.25 degrees or 0.125 degrees spacing, or the ERA Interim reanalysis product at 1.5 degrees, allow the estimation of the hydrostatic component of the tropospheric delay with an accuracy of 1 to 3 mm at global scale, provided an adequate model for the height dependence of atmospheric pressure is adopted. In comparison, for VMF1 grids provided at 2.5 degrees spacing, although the overall accuracy of ZHD estimation is 2-4 mm in most sites, in regions with high variability and strong seasonal signal in the surface pressure, VMF1 can reveal errors with a clear annual pattern and epochs for which the error exceeds the centimetre level. When used to estimate the wet component of the tropospheric delay (zenith wet delay, ZWD) for coastal altimetry, these errors can translate into errors of similar magnitude in sea level studies.
Language: English
Type (Professor's evaluation): Scientific
Contact: mjfernan@fc.up.pt; nelson.pir-es@fc.up.pt; clazaro@fc.up.pt; anunes@ciimar.-up.pt
No. of pages: 17
Documents
We could not find any documents associated to the publication.
Related Publications

Of the same authors

GNSS-Derived Path Delay: An Approach to Compute the Wet Tropospheric Correction for Coastal Altimetry (2010)
Article in International Scientific Journal
Joana Fernandes, MJ; Clara Lazaro; Alexandra L Nunes; Nelson Pires; Luisa Bastos; Virgilio B Mendes

Of the same journal

Understanding northeastern tropical atlantic ocean dynamics in relation to climate indices (2025)
Article in International Scientific Journal
Cardoso, I; Iglesias, I; Lorenzo, MN; Amorim, FN; Fernandes, MJ; Clara Lazaro
Spatio-temporal variability of the wet component of the troposphere - Application to satellite altimetry (2019)
Article in International Scientific Journal
Vieira, E; Clara Lazaro; Fernandes, MJ
On¿off intermittency and spatiotemporal chaos in three-dimensional Rayleigh¿Bénard convection (2016)
Article in International Scientific Journal
Chimanski, EV; Rempel, EL; Chertovskih, R
Kinetic study of a N-2-CH4 afterglow plasma for production of N-containing hydrocarbon species of Titan's atmosphere (2010)
Article in International Scientific Journal
Carlos Daniel Diogo Matias Pintassilgo; Loureiro, J

See all (12)

Recommend this page Top
Copyright 1996-2025 © Faculdade de Direito da Universidade do Porto  I Terms and Conditions  I Acessibility  I Index A-Z
Page created on: 2025-07-23 at 00:16:47 | Privacy Policy | Personal Data Protection Policy | Whistleblowing