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. Copyright 2004 by the American Geophysical Union.

Item Type:	Refereed Article
Keywords:	Data reduction; Global positioning system; Mathematical models; Oceanography; Harmonic motions; Ocean tide loading (OTL); Tides; diurnal variation; GPS; loading; ocean tide; spherical harmonics
Research Division:	Earth Sciences
Research Group:	Physical geography and environmental geoscience
Research Field:	Physical geography and environmental geoscience not elsewhere classified
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the earth sciences
UTAS Author:	King, MA (Professor Matt King)
ID Code:	81807
Year Published:	2004
Web of Science® Times Cited:	35
Deposited By:	Geography and Environmental Studies
Deposited On:	2013-01-08
Last Modified:	2013-01-08
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