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contributor authorRomea, Richard D.
contributor authorSmith, Robert L.
date accessioned2017-06-09T14:46:40Z
date available2017-06-09T14:46:40Z
date copyright1983/08/01
date issued1983
identifier issn0022-3670
identifier otherams-26545.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4163451
description abstractTime 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, ? < 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.
publisherAmerican Meteorological Society
titleFurther Evidence for Coastal Trapped Waves along the Peru Coast
typeJournal Paper
journal volume13
journal issue8
journal titleJournal of Physical Oceanography
identifier doi10.1175/1520-0485(1983)013<1341:FEFCTW>2.0.CO;2
journal fristpage1341
journal lastpage1356
treeJournal of Physical Oceanography:;1983:;Volume( 013 ):;issue: 008
contenttypeFulltext


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