Comparison between the harmonic and response methods of tidal analysis using TOPEX/POSEIDON altimetry |
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| Authors: | A J E Smith B A C Ambrosius K F Wakker P L Woodworth J M Vassie |
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| Institution: | (1) Delft University of Technology, Section Space Research and Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands e-mail: arthur.smith@lr.tudelft.nl , NL;(2) Proudman Oceanographic Laboratory, Bidston Observatory, Birkenhead, Merseyside L43 7RA, United Kingdom, GB |
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| Abstract: | Three years of TOPEX/POSEIDON altimeter data have been processed at Delft Institute for Earth-Oriented Space Research (DEOS)
to solve the major diurnal and semi-diurnal constituents of the global ocean tide using the two classical methods of tidal
analysis, i.e. the harmonic and response analyses. Some experiments with the parameters in the response formalism show that the tidal admittance
in both the diurnal and semi-diurnal band can be adequately described with a lag interval of 2 days and a number of lags of
three. Results of both methods are evaluated from the differences with the most recent Grenoble hydrodynamic model (FES95.2)
and from the fit with the harmonic constants of a globally distributed set of tide gauges. It was found that the solutions
of the two methods differ at the millimeter level and are thus fully equivalent, which is confirmed by the tide gauges and
the differences with FES95.2. From the comparisons with the Grenoble model it was found that the M
2 and S
2 solutions of that model likely contain bathymetric errors which are of the order of 1–2 cm for M
2 and 0.5 cm for S
2.
Received: 18 December 1996 / Accepted: 12 May 1997 |
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| Keywords: | , Ocean tide,Harmonic analysis,Response analysis,TOPEX/POSEIDON altimetry |
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