Decay mechanism of the 2004/05 Kuroshio large meander

Usui, Norihisa; Tsujino, Hiroyuki; Nakano, Hideyuki; Fujii, Yosuke; Kamachi, Masafumi

doi:10.1029/2011jc007009

Cited by 23 publications

(28 citation statements)

References 45 publications

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“…A similar process in some actual Kuroshio large meander events was reported by Nishida (1982), Kawabe (1995), and Usui et al (2011). Kawabe (1995) also pointed out that the LM path usually shifts to the straight path by moving eastward and straddling the Izu Ridge, ultimately decreasing in amplitude.…”

Section: Discussionmentioning

confidence: 55%

“…As a result, the Kuroshio straight path forms (Fig.7h). The positive vorticity advecting downstream during this stage was also found by Usui et al (2011). To further investigate the role of this vorticity advection, we removed this term from the model and then integrated it.…”

Section: Fig3 Stream Function (Cm 2 /S) Of Lm Path Obtained When V Mmentioning

confidence: 96%

“…This causes a cyclonic eddy to shed from the Kuroshio mainstream, which weakens the LM path to become a small meander path ( Fig.7b-d). This process is similar to the high potential vorticity water shedding process in the 2004/05 Kuroshio LM identifi ed by Usui et al (2011) using data of assimilated satellite altimeter-derived sea surface height (SSH) and observed temperature and salinity profi les. Nishida (1982) also found a similar eddy shedding process from observations during the LM period of 1975-1980.…”

Section: Fig3 Stream Function (Cm 2 /S) Of Lm Path Obtained When V Mmentioning

confidence: 96%

“…(1) upstream perturbations may induce the transition from LM to straight path ; (2) cyclonic eddies shed from the Kuroshio mainstream can cause that transition (Kawabe, 1995); (3) topography may affect the transition, e.g., Sekine (1993) indicated that the friction of Izu Ridge readily induces the transition, but in contrast, Mitsudera et al (2006) suggested that this ridge acts to stabilize the LM path; and (4) Usui et al (2011) pointed out that the upstream perturbations, topography, and positive vorticity advecting downstream infl uence the transition process. These physical mechanism studies can provide guidance for improving numerical modeling, which will increase the ability to predict Kuroshio path variations.…”

Section: Introductionmentioning

confidence: 97%

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Optimal precursor of the transition from Kuroshio large meander to straight path

Wang

2013

Chin. J. Ocean. Limnol.

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We used the conditional nonlinear optimal perturbation (CNOP) method to explore the optimal precursor of the transition from Kuroshio large meander (LM) to straight path within a barotropic infl owoutfl ow model, and found that large amplitudes of the optimal precursor are mainly located in the east of Kyushu, which implies that perturbations in the region are important for the transition from LM to straight path. Furthermore, we investigated the transition processes caused by the optimal precursor, and found that these processes could be divided into three stages. In the fi rst stage, a cyclonic eddy is advected to the formation region of the Kuroshio large meander, which enhances the LM path and causes a cyclonic eddy to shed from the Kuroshio mainstream. This process causes the LM path to change into a small meander path. Subsequently, the small meander is maintained for a period because the vorticity advection is balanced by the beta effect in the second stage. In the third stage, the small meander weakens and the straight path ultimately forms. The positive vorticity advecting downstream is responsible for this process. The exploration of the optimal precursor will conduce to improve the prediction of the transition processes from LM path to straight path, and its spatial structure can be used to guide Kuroshio targeted observation studies.

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Section: Discussionmentioning

confidence: 55%

Section: Fig3 Stream Function (Cm 2 /S) Of Lm Path Obtained When V Mmentioning

confidence: 96%

Section: Fig3 Stream Function (Cm 2 /S) Of Lm Path Obtained When V Mmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

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Optimal precursor of the transition from Kuroshio large meander to straight path

Wang

2013

Chin. J. Ocean. Limnol.

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“…The Kuroshio persisted in the nonlarge meander state from 1991 through June 2004 (Ambe et al, 2004;Kawabe, 2005) and then again from August 2005 to 2010 (Usui et al, 2013). A large meander state from September 2004 through January 2005 (Usui et al, 2011) was first observed in satellite altimetry records (which began in late 1992) and is thus far the only large meander reported in satellite altimetry data. It is interesting to note that the Kuroshio path suggested by drifter mean speed mapping (Figure 2c) indicates a non-large meander state south of Japan.…”

Section: The Kuroshio South Of Japanmentioning

confidence: 92%

Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern Japan

Andres¹,

Jan²,

Sanford³

et al. 2015

Oceanog

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Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern JapanABSTRACT. In the subtropical western North Pacific Ocean, the Kuroshio delivers heat, salt, and momentum poleward, much like its North Atlantic analog, the Gulf Stream. Though the Kuroshio generally flows along the western boundary from Taiwan to southeastern Japan as an "attached" current, the Kuroshio's strength, vertical structure, and horizontal position undergo significant temporal and spatial variability along this entire route. Ubiquitous mesoscale eddies and complicated topography associated with a string of marginal seas combine to make the western North Pacific a region with complex circulation. Here, we synthesize results from the recent US Origins of the Kuroshio and Mindanao Currents and Taiwan Observations of Kuroshio Transport Variability observational programs with previous findings to build a comprehensive picture of the Kuroshio on its route from northeastern Taiwan to southeastern Japan, where the current finally transitions from a western boundary current into the Kuroshio Extension, a vigorously meandering free jet. in the western North Pacific over the past decades, many of them supported by ONR, that have focused on different sections along the Kuroshio (Table 1). Here, we summarize some of these earlier field programs and synthesize them with OKMC/OKTV results to describe the downstream evolution of the Kuroshio along its route from the western Philippine Basin through the East China Sea to south of Japan (Figure 1a). MEASURING THE KUROSHIODue to the rich eddy field in the western North Pacific (Figure 2a), individual synoptic sections across the Kuroshio from shipboard measurements are often not representative of the current's mean state. Longer duration measurements (or many crossings) are needed to estimate the current's mean transport and velocity structure. Since 1991, arrays of inverted echo sounders (IESs) have been deployed at various sections across the Kuroshio (e.g., Table 1 and the green lines in Figure 3a) to measure variability at hourly resolution for durations of one year or more. In most cases, the IESs were also equipped with pressure sensors (PIESs) and additional current sensors (CPIESs) or horizontal electric field sensors (HPIESs) to help establish the Kuroshio's time-varying position, absolute geostrophic transport, and velocity structure (see Meinen et al., 2002;Donohue et al., 2010;and Szuts, 2012, for reviews of the methodologies and the title page photo [opposite] for an image of a PIES). One of these experiments was along the Affiliated Surveys of the Kuroshio off Cape Ashizuri (ASUKA) Line, which extends 1,000 km southeastward from Shikoku, Japan, into the Philippine Basin (Figure 3a). A full array of instruments was deployed there from 1993 to 1995 (Book et al., 2002) with a reduced two-IES array maintained through (Kakinoki et al., 2008. Two IES arrays were also deployed along the PN Line, a repeat hydrographic line in the East China Sea northwest of Okinawa (labele...

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The Research Advancements and Historical Episodes brought by the Kuroshio Flowing across Generations

2019

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Decay mechanism of the 2004/05 Kuroshio large meander

Cited by 23 publications

References 45 publications

Optimal precursor of the transition from Kuroshio large meander to straight path

Optimal precursor of the transition from Kuroshio large meander to straight path

Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern Japan

The Research Advancements and Historical Episodes brought by the Kuroshio Flowing across Generations

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