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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39948

Title: Statistical Characteristics of Mesoscale Eddies in the North Pacific Derived from Satellite Altimetry
Authors: Yu-Hsin Cheng
Chung-Ru Ho
Quanan Zheng
Nan-Jung Kuo 1
Contributors: 國立臺灣海洋大學:海洋環境資訊學系
Keywords: eddy detection algorithm
mesoscale eddy
North Pacific
sea level anomaly
Date: 2014-06
Issue Date: 2017-01-10T08:35:18Z
Publisher: remote sensing
Abstract: Abstract: The sea level anomaly data derived from satellite altimetry are analyzed to investigate statistical characteristics of mesoscale eddies in the North Pacific. Eddies are detected by a free-threshold eddy identification algorithm. The results show that the distributions of size, amplitude, propagation speed, and eddy kinetic energy of eddy follow the Rayleigh distribution. The most active regions of eddies are the Kuroshio Extension region, the Subtropical Counter Current zone, and the Northeastern Tropical Pacific region. By contrast, eddies are seldom observed around the center of the eastern part of the North Pacific Subarctic Gyre. The propagation speed and kinetic energy of cyclonic and anticyclonic eddies are almost the same, but anticyclonic eddies possess greater lifespans, sizes, and amplitudes than those of cyclonic eddies. Most eddies in the North Pacific propagate westward except in the Oyashio region. Around the northeastern tropical Pacific and the California currents, cyclonic and anticyclonic eddies propagate westward with slightly equatorward (197° average azimuth relative to east) and poleward (165°) deflection, respectively. This implies that the background current may play an important role in formation of the eddy pathway patterns.
Relation: 6(6)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39948
Appears in Collections:[海洋環境資訊系] 期刊論文

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