Further Evidence for Coastal Trapped Waves along the Peru Coast Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/j67315191

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  • Time series of coastal sea level during 1976–77, from 2°12′S to 17°S along the west coast of South America, show that low-frequency, ω < 0.25 cycles per day (cpd), fluctuations propagate poleward with the phase speed of baroclinic Kelvin waves (2–3 m s⁻¹). The alongshore coherence is highest in the frequency band 0.1–0.2 cpd. Computing the frequency-domain empirical orthogonal functions (EOF) for alongshore current, from an army of current meters extending from 5°S to 15°S during March-May 1977, gives 70% of the variance in the 0.1–0.2 cpd frequency band to an EOF mode with poleward phase propagation at 2.75 m s⁻¹. The vertical structure of the alongshore current fluctuations (0.1–0.2 cpd) over the continental slope at 5°S and 15°S is consistent with a first-mode baroclinic Kelvin wave. The current and sea-level fluctuations are coherent and propagate poleward through latitudes where their frequency equals the local inertial frequency. The fluctuations are not significantly coherent with coastal winds from 4°S to 15°S and am therefore presumed to have an equatorial origin. Intermittent sea-level data at the Galapagos Islands during the period provide tenuous evidence that these fluctuations, propagating poleward as coastally trapped waves, previously traveled in the equatorial wave guide.
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  • Romea, Richard D., Robert L. Smith, 1983: Further Evidence for Coastal Trapped Waves along the Peru Coast. Journal of Physical Oceanography, 13, 1341–1356.
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  • description.provenance : Made available in DSpace on 2012-02-08T18:09:49Z (GMT). No. of bitstreams: 1 SmithRobertL.CEOAS.FurtherEvidenceCoastal.pdf: 1269402 bytes, checksum: 4b1dfced39125cc6cd9949bb92629255 (MD5) Previous issue date: 1983-08
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