Trajectories of Mesoscale Eddies in Northwestern Region of the Hawaiian Islands Derived from Sea Surface Height Altimetry Data

dc.contributor.advisor Qiu, Bo Nakagawa, Kazuhiro
dc.contributor.department Oceanography
dc.contributor.department Global Environmental Science 2020-08-18T23:58:05Z 2020-08-18T23:58:05Z 2004
dc.description.course OCN 499 - Undergraduate Thesis
dc.identifier.uri Honolulu
dc.subject physical oceanography
dc.subject eddy
dc.subject tides
dc.title Trajectories of Mesoscale Eddies in Northwestern Region of the Hawaiian Islands Derived from Sea Surface Height Altimetry Data
dc.type Thesis
dcterms.abstract The structures of warm-core eddies and cold-core eddies were studied in the Northwestern region of the Hawaiian Islands. The study area extends from 180 ˚ W to 140 ˚ W in the zonal band 21˚N to 35˚ N. The variability of the sea surface height (SSH) was derived from the combined mission of TOPEX/Poseidon and ERS altimeters during the period between October 1992 and January 2004 and used to visualize the natures of several eddies generated in this region. Warm-core and coldcore eddies have been traced on maps with the altimeter observations every seven days. Emphasis was placed on the investigation of the spatial and temporal contexts for warm-core and cold-core eddies. It was found that both the warm and cold-core eddies propagated westward in the study area, and the propagation speed has been estimated as 3.25 cm/s. It was also discovered that the warm-core and cold-core eddies were generated by the baroclinic instability in the Subtropical Frontal Zone (STFZ), which is located at 28˚ to 30˚N, and that most of the eddies were observed to disappear along the islands. Eddies were affected by bottom topography in the vicinity of Hawaiian Ridge. In particular, the sea floor shallower than the depth of 1000 meters blocked mesoscale eddies. Finally, the Eddy Kinetic Energy (EKE), horizontal temperature distribution within warm-core eddy and cold-core eddy, and the relationship between eddy propagation speed and latitude were all investigated.
dcterms.extent 49 pages
dcterms.language English
dcterms.publisher University of Hawaiʻi at Mānoa
dcterms.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.
dcterms.rightsholder Nakagawa, Kazuhiro
dcterms.type Text
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