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A directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios

Masoumi, Amir; McClusky, Simon; Koulali, Achraf; Tregoning, Paul

Description

Improper modeling of horizontal tropospheric gradients in GPS analysis induces errors in estimated parameters, with the largest impact on heights and tropospheric zenith delays. The conventional two-axis tilted plane model of horizontal gradients fails to provide an accurate representation of tropospheric gradients under weather conditions with asymmetric horizontal changes of refractivity. A new parametrization of tropospheric gradients whereby an arbitrary number of gradients are estimated as...[Show more]

dc.contributor.authorMasoumi, Amir
dc.contributor.authorMcClusky, Simon
dc.contributor.authorKoulali, Achraf
dc.contributor.authorTregoning, Paul
dc.date.accessioned2021-04-27T23:40:52Z
dc.date.available2021-04-27T23:40:52Z
dc.identifier.issn2169-897X
dc.identifier.urihttp://hdl.handle.net/1885/231054
dc.description.abstractImproper modeling of horizontal tropospheric gradients in GPS analysis induces errors in estimated parameters, with the largest impact on heights and tropospheric zenith delays. The conventional two-axis tilted plane model of horizontal gradients fails to provide an accurate representation of tropospheric gradients under weather conditions with asymmetric horizontal changes of refractivity. A new parametrization of tropospheric gradients whereby an arbitrary number of gradients are estimated as discrete directional wedges is shown via simulations to significantly improve the accuracy of recovered tropospheric zenith delays in asymmetric gradient scenarios. In a case study of an extreme rain event that occurred in September 2002 in southern France, the new directional parametrization is able to isolate the strong gradients in particular azimuths around the GPS stations consistent with the "V" shape spatial pattern of the observed precipitation. In another study of a network of GPS stations in the Sierra Nevada region where highly asymmetric tropospheric gradients are known to exist, the new directional model significantly improves the repeatabilities of the stations in asymmetric gradient situations while causing slightly degraded repeatabilities for the stations in normal symmetric gradient conditions. The average improvement over the entire network is ∼31%, while the improvement for one of the worst affected sites P631 is ∼49% (from 8.5 mm to 4.3 mm) in terms of weighted root-mean-square (WRMS) error and ∼82% (from -1.1 to -0.2) in terms of skewness. At the same station, the use of the directional model changes the estimates of zenith wet delay by 15 mm (∼25%)
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley
dc.rights© 2017. American Geophysical Union
dc.sourceJournal of Geophysical Research: Atmospheres
dc.titleA directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume122
dc.date.issued2017
local.identifier.absfor040107 - Meteorology
local.identifier.absfor090902 - Geodesy
local.identifier.ariespublicationa383154xPUB5850
local.publisher.urlhttps://www.wiley.com/en-au
local.type.statusPublished Version
local.contributor.affiliationMasoumi, Amir, College of Health and Medicine, ANU
local.contributor.affiliationMcClusky, Simon, College of Science, ANU
local.contributor.affiliationKoulali, Achraf, College of Science, ANU
local.contributor.affiliationTregoning, Paul, College of Science, ANU
local.bibliographicCitation.issue8
local.bibliographicCitation.startpage4401
local.bibliographicCitation.lastpage4425
local.identifier.doi10.1002/2016JD026184
local.identifier.absseo960299 - Atmosphere and Weather not elsewhere classified
dc.date.updated2020-11-23T10:05:15Z
local.identifier.scopusID2-s2.0-85018592819
local.identifier.thomsonID000401180800016
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/11020..."The Published Version can be archived in a Non-Commercial Institutional Repository. 6 months embargo" from SHERPA/RoMEO site (as at 28/04/2021).
CollectionsANU Research Publications

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