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An estimate of equatorial wave energy flux at 9- to 90-day periods in the Central PacificDeep fluctuations in current along the equator in the Central Pacific are dominated by coherent structures which correspond closely to narrow-band propagating equatorial waves. Currents were measured roughly at 1500 and 3000 m depths at five moorings between 144 and 148 deg W from January 1981 to March 1983, as part of the Pacific Equatorial Ocean Dynamics program. In each frequency band resolved, a single complex empirical orthogonal function accounts for half to three quarters of the observed variance in either zonal or meridional current. Dispersion for equatorial first meridional Rossby and Rossby gravity waves is consistent with the observed vertical-zonal coherence structure. The observations indicate that energy flux is westward and downward in long first meridional mode Rossby waves at periods 45 days and longer, and eastward and downward in short first meridional mode Rossby waves and Rossby-gravity waves at periods 30 days and shorter. A local minimum in energy flux occurs at periods corresponding to a maximum in upper-ocean meridional current energy contributed by tropical instability waves. Total vertical flux across the 9- to 90-day period range is 2.5 kW/m.
Document ID
19890035218
Document Type
Reprint (Version printed in journal)
Authors
Eriksen, Charles C. (Washington, University Seattle, United States)
Richman, James G. (NASA Headquarters Washington, DC United States)
Date Acquired
August 14, 2013
Publication Date
December 15, 1988
Publication Information
Publication: Journal of Geophysical Research
Volume: 93
ISSN: 0148-0227
Subject Category
OCEANOGRAPHY
Funding Number(s)
CONTRACT_GRANT: NSF OCE-79-21820
CONTRACT_GRANT: NSF OCE-84-03261
CONTRACT_GRANT: NSF OCE-88-05211
CONTRACT_GRANT: NSF OCE-80-24911
CONTRACT_GRANT: NSF OCE-83-17661
CONTRACT_GRANT: NSF OCE-82-14848
Distribution Limits
Public
Copyright
Other