The Kuroshio large meander formation in 2004 analyzed by an eddy-resolving ocean forecast system

2008 ◽  
Vol 113 (C10) ◽  
Author(s):  
Yasumasa Miyazawa ◽  
Takashi Kagimoto ◽  
Xinyu Guo ◽  
Hirofumi Sakuma
Keyword(s):  
Large Meander ◽  
Forecast System ◽  
Kuroshio Large Meander ◽  
The Kuroshio

scholarly journals Atmospheric Effects of the Kuroshio Large Meander during 2004–05*

2010 ◽  
Vol 23 (17) ◽  
pp. 4704-4715 ◽  
Author(s):  
Haiming Xu ◽  
Hiroki Tokinaga ◽  
Shang-Ping Xie
Keyword(s):  
Wind Speed ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Atmospheric Effects ◽  
Water Pool ◽  
Large Meander ◽  
Cool Water ◽  
Japanese Coast ◽  
Kuroshio Large Meander ◽  
The Kuroshio

Abstract In the summer of 2004, the Kuroshio took a large meander path south of Japan for the first time since 1991, and this large meander event persisted until the next summer. Satellite observations and numerical model simulations are used to study the effect of this large meander event on the atmosphere. The large meander leaves a cool water pool between the Kuroshio and Japanese coast. Sea surface temperature (SST) in the cool water pool is about 2°–3°C colder than the surroundings during winter and spring, whereas the SST signature substantially weakens in summer. A local reduction of wind speed is found over the cool water pool, and the positive SST–wind speed correlation is indicative of ocean forcing of the atmosphere. Cloud liquid water (CLW) content and precipitation also decrease over the cool SST pool. A regional atmospheric model successfully simulates atmospheric response to the Kuroshio large meander. The model experiments suggest that the reduced surface wind speed and precipitation are due to the large meander-induced SST cooling. Analysis of the surface perturbation momentum budgets shows the importance of the pressure adjustment mechanism in surface wind response to the cold SST anomalies.

The Nonlinear Optimal Triggering Perturbation of the Kuroshio Large Meander and Its Evolution in a Regional Ocean Model

2018 ◽  
Vol 48 (8) ◽  
pp. 1771-1786 ◽  
Author(s):  
Xia Liu ◽  
Mu Mu ◽  
Qiang Wang
Keyword(s):  
Ocean Model ◽  
Ocean Modeling ◽  
Cyclonic Eddy ◽  
Regional Ocean Modeling System ◽  
Large Meander ◽  
Optimal Perturbation ◽  
Nonlinear Advection ◽  
Kuroshio Large Meander ◽  
Opposing Effects ◽  
The Kuroshio

AbstractBased on the Regional Ocean Modeling System (ROMS) and the conditional nonlinear optimal perturbation (CNOP) method, we explore the nonlinear optimal triggering perturbation of the Kuroshio large meander (LM) and its evolution, and reveal the role of nonlinear physical processes in the formation of the LM path. The results show that the large amplitudes of the perturbations are mainly located in the upper 2000 m in the southeastern area of Kyushu (29°–32°N, 131°–134°E), where the eastward propagation of the cold anomaly is vital to the formation of the LM path. By analyzing the depth-integrated vorticity equation of the perturbation, we find that linear advection, namely, the interaction between the perturbation and the reference field, tends to move the cyclonic eddy induced by the optimal triggering perturbation eastward, while the nonlinear advection associated with the interaction of perturbations tends to move the cyclonic eddy westward. The opposing effects of the nonlinear advection and the linear advection slow the eastward movement of the cyclonic eddy so that the eddy has a chance to effectively develop, eventually leading to the formation of the Kuroshio LM path.

scholarly journals Application of singular vector analysis to the Kuroshio large meander

2008 ◽  
Vol 113 (C7) ◽  
Author(s):  
Yosuke Fujii ◽  
Hiroyuki Tsujino ◽  
Norihisa Usui ◽  
Hideyuki Nakano ◽  
Masafumi Kamachi
Keyword(s):  
Singular Vector ◽  
Vector Analysis ◽  
Large Meander ◽  
Kuroshio Large Meander ◽  
The Kuroshio

scholarly journals Blocking of the Kuroshio Large Meander by Baroclinic Interaction with the Izu Ridge

2006 ◽  
Vol 36 (11) ◽  
pp. 2042-2059 ◽  
Author(s):  
Humio Mitsudera ◽  
Bunmei Taguchi ◽  
Takuji Waseda ◽  
Yasushi Yoshikawa
Keyword(s):  
Rossby Waves ◽  
Western Slope ◽  
Large Meander ◽  
Kuroshio Large Meander ◽  
Topographic Rossby Waves ◽  
The Kuroshio ◽  
Izu Ridge ◽  
Sloping Bottom

Abstract This paper discusses the role of the Izu Ridge in blocking the Kuroshio large meander from propagating eastward across the ridge. It is shown that a combination of the sloping bottom with baroclinicity in the Kuroshio flow is important for blocking of the large meander. It produces a cyclonic torque over the western slope of the ridge when the large meander impinges upon it. That is, the cyclonic torque is formed ahead of the large meander, which results in blocking and amplification of the meander upstream of the Izu Ridge. The baroclinicity of the Kuroshio over the ridge is caused by baroclinic topographic Rossby waves generated when the large meander encounters the ridge.

scholarly journals Response of extratropical cyclone activity to the Kuroshio large meander in northern winter

2013 ◽  
Vol 40 (11) ◽  
pp. 2851-2855 ◽  
Author(s):  
Masamitsu Hayasaki ◽  
Ryuichi Kawamura ◽  
Masato Mori ◽  
Masahiro Watanabe
Keyword(s):  
Extratropical Cyclone ◽  
Cyclone Activity ◽  
Large Meander ◽  
Kuroshio Large Meander ◽  
Northern Winter ◽  
The Kuroshio
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