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Stability of direct GPS estimates of ocean tide loading

Lookup NU author(s): Craig Allinson, Professor Peter Clarke, Professor Stuart Edwards, Professor Matt King

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Abstract

We observe ocean tide loading (OTL) at diurnal and semi-diurnal periods by directly estimating fixed-period harmonic motions within individual daily GPS analyses. Stacking of multiple solutions allows us to isolate the principal near-diurnal and near-semi-diurnal OTL components. Using data from UK sites where predicted OTL for the M-2 component varies from 3-46 mm in amplitude, we show that our estimates are stable for the principal OTL components when data from at least 90 days are stacked. Our final observations are compared to model predictions (using the FES95.2, FES99, GOT00.2, TPXO.2, TPXO.6, NAO.99b and CSR3 models) and are in agreement with OTL predicted by FES99, but differ significantly at some locations from those predicted by the CSR3 and TPXO.2 tidal models.


Publication metadata

Author(s): Allinson CR, Clarke PJ, Edwards SJ, King MA, Baker TF, Cruddace PR

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2004

Volume: 31

Issue: 15

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: American Geophysical Union

URL: http://dx.doi.org/10.1029/2004GL020588

DOI: 10.1029/2004GL020588


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