DOI: 10.1002/2014GL060402
论文题名: Resonant ocean current responses driven by coastal winds near the critical latitude
作者: Kim S.Y. ; Crawford G.
刊名: Geophysical Research Letters
ISSN: 0094-9904
EISSN: 1944-9635
出版年: 2014
卷: 41, 期: 15 起始页码: 5581
结束页码: 5587
语种: 英语
英文关键词: critical latitude
; diurnal wind
; resonant ocean response
; surface currents
Scopus关键词: Analytical models
; Transfer functions
; Critical latitude
; Current response
; Diurnal wind
; Natural modes
; Ocean response
; Resonant response
; Surface current
; Transfer function analysis
; Coastal winds
; Current transfer functions
; Inertial motions
; Surface winds
; Ocean currents
; analytical method
; diurnal variation
; latitude
; oceanic current
; wind stress
英文摘要: The currents forced by wind stress near the critical latitude (30°N or 30°S) appear enhanced as a result of the combination of natural modes of ocean currents (e.g., near-inertial motions) and diurnal land/sea breeze-driven currents. Here we assess the wind-current transfer function, derived from observations of coastal surface currents and surface winds off the U.S. West Coast (32°N to 47°N), as a function of the latitude (alongshore direction) and frequency. We compare the transfer functions at the diurnal frequency derived from observations and two analytical models (e.g., the Ekman model and a near-surface averaged Ekman model). The amplitude of the data-derived transfer function decreases with increasing distance from the critical latitude, and its argument varies nearly within the range estimated from two analytical models. Our results confirm that the resonant wind-current responses near the critical latitude are 8 to 12 times stronger than the purely diurnal land/sea breeze-forced currents in other latitudes. Key Points Observational proof of resonant ocean response near the critical latitude Resonant responses are much stronger than the pure diurnal wind-forced currents Wind transfer function analysis across the latitude © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905759396&doi=10.1002%2f2014GL060402&partnerID=40&md5=c4038e034fafd97c7c5620e37608e865
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7168
Appears in Collections: 气候减缓与适应
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作者单位: Division of Ocean Systems Engineering, School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
Recommended Citation:
Kim S.Y.,Crawford G.. Resonant ocean current responses driven by coastal winds near the critical latitude[J]. Geophysical Research Letters,2014-01-01,41(15).