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Energetics of global ocean tides from Geosat altimetryThe present paper focuses on resonance and energetics of the daily tides, especially in the southern ocean, the distribution of gravitational power input of daily and half-daily tides, and comparison with other estimates of global dissipation rates. The present global tidal maps, derived from Geosat altimetry, compare favorably with ground truth data at about the same rms level as the models of Schwiderski (1983), and are slightly better in lunar than in solar tides. Diurnal admittances clearly show Kelvin wave structure in the southern ocean and confirm the resonant mode of Platzman (1984) at 28.5 + or - 0.1 hr with an apparent Q of about 4. Driving energy is found to enter dominantly in the North Pacific for the daily tides and is strongly peaked in the tropical oceans for the half-daily tides. Global rates of working on all major tide constituents except S2 agree well with independent results from analyses of gravity through satellite tracking. Comparison at S2 is improved by allowing for the air tide in gravitational results but suggests deficiencies in all solar tide models.
Document ID
19910068669
Document Type
Reprint (Version printed in journal)
Authors
Cartwright, David E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ray, Richard D. (NASA Goddard Space Flight Center; ST Systems Corp. Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
September 15, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
OCEANOGRAPHY
Distribution Limits
Public
Copyright
Other