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Wind driven currents south of Oahu

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Item Summary

Title: Wind driven currents south of Oahu
Authors: Castillo Trujillo, Alma Carolina
Keywords: meridional wind
Issue Date: Aug 2014
Publisher: [Honolulu] : [University of Hawaii at Manoa], [August 2014]
Abstract: Two years of HFDR currents south of Oahu were analyzed to understand the main modes of circulation. A relatively slow ( 20 cm/s) westward flow was observed with eastward reversals in winter and spring. To understand these reversals, their dependence on local wind forcing was investigated using buoy measurements and a 1.5-km resolution operational atmospheric model. Southerly winds were typically found when the reversals occurred. The dominant EOF mode accounts for 58% of the variance, and is significantly correlated with the meridional wind. To further assess the effect of the winds, the vorticity balance was estimated. The advective non-linear term is mostly balanced by vertical stretching of the water column and a residual term derived from the sum of those two terms. This residual term, is significantly correlated with the wind stress curl term derived from an atmospheric model, indicating that it is the main external forcing in the vorticity generation. An operational ROMS nested model for the Hawaiian Archipelago is used to understand the vertical behavior of the wind driven currents. Vertical modes computed from model currents are well correlated with both the wind and wind stress curl during trade wind conditions and suggest a rapid decay of wind effects below the Mixed Layer Depth.
Description: M.S. University of Hawaii at Manoa 2014.
Includes bibliographical references.
URI/DOI: http://hdl.handle.net/10125/100538
Rights: All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections:M.S. - Oceanography



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