Oceanic tides from Geosat altimetry

Details Oceanic tides from Geosat altimetry Oceanic tides from Geosat altimetry

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3069c&link_type=abstract

Journal of Geophysical Research, Volume 95, Issue C3, p. 3069-3090

Physics

129

Oceanography: Physical: Surface Waves And Tides, Oceanography: Physical: Instruments And Techniques

Scientific paper

Direct tidal analysis of the altimetry from the Geosat Exact Repeat Mission's first year is used to derive estimates of the diurnal and semidiurnal oceanic tides. The geoid is removed by collinear differences at 34.1-day separation, and the orbit error is reduced by subtracting a slowly modulated 1 cycle/revolution term. A sequence of independent analyses at grid areas of 1°latitude×1.5° longitude using ``orthotide'' functions ensures complete definition of the diurnal and semidiurnal species. Global admittance maps for M2 and S2 within the latitudes 58°N and 59°S compare well with ground truth at 66 open-ocean sites. Maps of differences between Geosat and the Naval Surface Weapons Center model show important areas of the order of 10-15 cm. The integral for the global power input from the moon gives 2.51 TW (M2), 0.44 TW (S2), lower than many previous estimates, but in agreement with figures deduced from a recent analysis of satellite orbits.

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