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Interannual variations in the Hawaiian Lee Countercurrent

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Title: Interannual variations in the Hawaiian Lee Countercurrent
Authors: Abe, Hiroto Browse this author →KAKEN DB
Hanawa, Kimio Browse this author →KAKEN DB
Ebuchi, Naoto Browse this author →KAKEN DB
Keywords: Hawaiian Lee Countercurrent
Interannual variation
Satellite altimeter
Baroclinic Rossby wave
Wind stress curl
Trade winds
Reduced gravity model
Issue Date: Apr-2013
Publisher: Springer
Journal Title: Journal of Oceanography
Volume: 69
Issue: 2
Start Page: 191
End Page: 202
Publisher DOI: 10.1007/s10872-012-0166-0
Abstract: The Hawaiian Lee Countercurrent (HLCC) is an eastward surface current flowing against the broad westward flow of the North Pacific subtropical circulation. Analyses of satellite altimeter data over 16 years revealed that the HLCC is characterized by strong interannual variations. The strength and meridional location of the HLCC axis varied significantly year by year. The eastward velocity of the HLCC was higher when the location of the axis was stable. Mechanisms for the interannual variations were explored by analyses of the altimeter data and results from a simple baroclinic model. The interannual variations in the strength of the HLCC did not correlate with those of the wind stress curl (WSC) dipole formed on the leeward side of the Hawaii Islands, although the WSC dipole has been recognized as the generation mechanism of the HLCC. Meridional gradients of the sea surface height anomaly (SSHA) across the HLCC generated by baroclinic Rossby waves propagating westward from the east of the Hawaii Islands were suggested as a possible mechanism for the interannual variations in the HLCC. The spatial patterns in the observed SSHAs were reproduced by a linear baroclinic Rossby wave model forced by wind fields from a numerical weather prediction model. Further analysis of the wind data suggested that positive and negative anomalies of WSC associated with changes in the trade winds in the area east of the Hawaii Islands are a major forcing for generating SSHAs that lead to the HLCC variations with a time lag of about 1 year.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/57820
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 阿部 泰人

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