scholarly journals Modulation of Rossby waves on the Pacific North Equatorial Current bifurcation associated with the 1976 climate regime shift

2014 ◽  
Vol 119 (10) ◽  
pp. 6669-6679 ◽  
Author(s):  
Li-Chiao Wang ◽  
Chau-Ron Wu ◽  
Bo Qiu
Keyword(s):  
Regime Shift ◽  
Rossby Waves ◽  
North Equatorial Current ◽  
Climate Regime ◽  
Climate Regime Shift ◽  
The Pacific ◽  
Equatorial Current ◽  
North Equatorial Current Bifurcation

scholarly journals The climate regime shift over the Pacific during 1996/1997

2013 ◽  
Vol 43 (1-2) ◽  
pp. 435-446 ◽  
Author(s):  
Chi-Cherng Hong ◽  
Yi-Kai Wu ◽  
Tim Li ◽  
Chih-Chun Chang
Keyword(s):  
Regime Shift ◽  
Climate Regime ◽  
Climate Regime Shift ◽  
The Pacific

scholarly journals Synchrony in the abundance trend of spear squid Loligo bleekeri in the Japan Sea and the Pacific Ocean with special reference to the latitudinal differences in response to the climate regime shift

2013 ◽  
Vol 70 (5) ◽  
pp. 968-979 ◽  
Author(s):  
Yongjun Tian ◽  
Kazuya Nashida ◽  
Hideo Sakaji
Keyword(s):  
Pacific Ocean ◽  
Environmental Factors ◽  
Regime Shift ◽  
Japan Sea ◽  
Climate Regime ◽  
Climate Regime Shift ◽  
The Pacific ◽  
The Japan Sea ◽  
Abundance Trends ◽  
The Pacific Ocean

Abstract Tian, Y., Nashida, K., and Sakaji, H. 2013. Synchrony in the abundance trend of spear squid Loligo bleekeri in the Japan Sea and the Pacific Ocean with special reference to the latitudinal differences in response to the climate regime shift. – ICES Journal of Marine Science, 70: 968–979. Spear squid Loligo bleekeri is widely distributed in the Japanese coastal waters. The fisheries depend largely on four stocks: the southern and northern stocks both in the Japan Sea and the coastal regions of the Pacific. The catch per unit effort (cpue) for the northern stock in the Japan Sea decreased substantially during the 1980s but increased during the 1990s, while the abundance index for the southern stock showed the opposite trend. The cpue for the southern and northern stocks in the Pacific coast showed a similar pattern to that in the Japan Sea. The synchrony in the abundance trends between the Japan Sea and the Pacific Ocean, and latitudinal differences between the northern and southern stocks indicate the impact of the climate regime shift. Generalized additive model analysis identified significant effects of environmental factors. Increased water temperature had a positive effect on the northern stock but a negative effect on the southern stock in the Japan Sea and the Pacific, whereas El Niño–southern oscillation events and the Asian monsoon had additional significant effects on the Pacific stocks. These results suggest that the abundance trends of spear squid were largely forced by environmental factors with latitudinal differences in the response to the climate regime shift.

scholarly journals Response of the Kuroshio Extension to Rossby Waves Associated with the 1970s Climate Regime Shift in a High-Resolution Ocean Model*

2005 ◽  
Vol 18 (15) ◽  
pp. 2979-2995 ◽  
Author(s):  
Bunmei Taguchi ◽  
Shang-Ping Xie ◽  
Humio Mitsudera ◽  
Atsushi Kubokawa
Keyword(s):  
Boundary Layer ◽  
High Resolution ◽  
Regime Shift ◽  
Rossby Waves ◽  
Kuroshio Extension ◽  
Ocean Model ◽  
Western Boundary ◽  
Climate Regime ◽  
Climate Regime Shift ◽  
The Kuroshio

Abstract The response of the Kuroshio Extension (KE) to large-scale Rossby waves remotely excited by wind stress changes associated with the 1970s climate regime shift is studied using a high-resolution regional ocean model. Two ensemble simulations are conducted: The control run uses monthly climatological forcing while, in the second ensemble, anomalous forcing is imposed at the model eastern boundary around 165°E derived from a hindcast of decadal changes in subsurface temperature and salinity using a coarser-resolution model of the Pacific basin. Near the KE, ocean adjustment deviates strongly from the linear Rossby wave dynamics. Most notably, the eastward acceleration of the KE is much narrower in meridional extent than that associated with the incoming Rossby waves imposed on the eastern boundary. This KE acceleration is associated with an enhanced potential vorticity (PV) gradient across the front that is consistent with the inertial western boundary layer theory: the arrival of the Rossby waves at the western boundary causes the eastward current to accelerate, leading to enhanced advection of low (high) PV water of subtropical (subarctic) origin along the western boundary layer. The meridional dipole of PV anomalies results in a pair of anomalous recirculations with a narrow eastward jet in between. A three-layer quasigeostrophic model is used to demonstrate this inertial adjustment mechanism. Finally, transient eddy activity increases significantly and the eddy momentum transport acts to strengthen the mean flow response. The result that ocean physical response to broad-scale atmospheric forcing is large near the KE front has important implications for fisheries research.

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