Modulation of rossby waves on the pacific north equatorial current bifurcation associated with the 1976 climate regime shift

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Title:	Modulation of rossby waves on the pacific north equatorial current bifurcation associated with the 1976 climate regime shift
Authors:	王儷樵;Wang, Li‐Chiao;Wu, Chau‐Ron;Qiu, Bo
Contributors:	地球科學學院大氣科學學系
Date:	2014-01-01
Issue Date:	2026-04-21 13:52:47 (UTC+8)
Publisher:	Wiley-Blackwell
Abstract:	摘要： Simulated current velocity and long‐term reanalysis wind data are used to investigate interannual variations in the bifurcation of the Pacific North Equatorial Current (NEC) after the 1976 climate regime shift. Wind stress curl anomaly (WSCA) in the region of 10°N–15°N and 160°E–170°E generates Rossby waves and affects the NEC bifurcation along the Philippine coast. From 1976 to 1992, following a regime shift to the positive Pacific Decadal Oscillation (PDO) phase, PDO and El Niño‐Southern Oscillation (ENSO) match each other in strength and have a neutralized effect on the WSCA. From 1993 to 2009, WSCA matches PDO well, and its correlation with ENSO is lower. Using a linear regression model, we show that the influence of PDO has nearly 13 times weight over that of ENSO. Prior to the 1976 regime shift, WSCA is closely related to ENSO from 1961 to 1975, and it does not correlate significantly with PDO. Our analysis results show that Rossby waves are preferentially generated in either the negative PDO phase when the ENSO signal dominates, or in the positive PDO phase when the ENSO signal is overshadowed. In the phase when the positive PDO counteracts with the ENSO signal, neither ENSO nor PDO has a significant influence on Rossby wave generations through the WSCA. The NEC bifurcation is modulated by Rossby waves to the east Rossby wave generation is closely related to wind stress curl pattern It is not proper to consider wind field in the same frame for all years 出版日期： 2014-10 出處： Journal of geophysical research. Oceans, 2014-10, Vol.119 (10), p.6669-6679 資源來源： Wiley Online Library All Journals 識別號： ISSN: 2169-9275 識別號： EISSN: 2169-9291 識別號： DOI: 10.1002/2014JC010233
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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