Temporal and spatial variability of volume transport of the Kuroshio in the East China Sea

Ichikawa, Hiroshi; Beardsley, Robert C.

doi:10.1016/0967-0637(93)90147-u

Cited by 137 publications

(94 citation statements)

References 11 publications

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“…The cross product of the wind stress vector with the gradient vector of ocean depth basically plays an important role in the vorticity balance near the Tokara Strait. This is consistent with observational results from Ichikawa and Beardsley (1993) who indicated that the Kuroshio volume transport is positively correlated with local down stream wind stress.…”

Section: Summary and Discussionsupporting

confidence: 82%

“…The map of the eigenfunction of the second mode shows the remarkable seasonal variation with a maximum in summer and a minimum in autumn found in the model-calculated transport at the Tokara Strait almost extends over the East China Sea. This distribution is supported by observational results that the Kuroshio volume transport is large in summer (Ichikawa and Beardsley, 1993).…”

Section: Summary and Discussionsupporting

confidence: 74%

“…For example, Taft (1972) analyzed axial GEK current speed, speed from ship displacement observations and volume transport relative to 800 db and reported that a maximum appears in summer. Recently, Ichikawa and Beardsley (1993) examined the temporal and spatial variability of absolute geostrophic volume transport of the Kuroshio using hydrographic and surface current data *Present address: Center for Climate System Research, University of Tokyo, Tokyo 153, Japan. **Present address: Fujitsu Limited, Numazu, Shizuoka 410-03, Japan.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of the seasonal transport variation through the Tokara Strait

1995

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To investigate a mechanism of the seasonal variation of transport through the Tokara Strait, two numerical experiments with real geometry and wind forcing were carried out. The models are linear barotropic models which are a North Pacific Ocean model and a limited-area model with a fine grid. The seasonal variation of volume transport with a maximum in the summer and a minimum in the autumn could be well reproduced by both models. The results demonstrate the wind stress component normal to a gradient vector of bottom topography is crucial for determining the seasonal variation. The similar seasonal variation widely covers the East China Sea and has a large amplitude near the Tokara Strait. Finally, it can be concluded that winds north of 35°N have little influence on the seasonal response of our model at the Tokara Strait.

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Section: Summary and Discussionsupporting

confidence: 82%

Section: Summary and Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Mechanism of the seasonal transport variation through the Tokara Strait

1995

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“…He estimated the 1955-1964 mean geostrophic volume transport relative to the 1000 dbar level in the east or southeast of Amami-Ohshima Island to be 16 Sv northeastward. Ichikawa and Beardsley (1993) calculated the absolute volume transports of the Kuroshio in the ECS and those in the top 600 m layer southeast of Cape Toi by combined use of hydrographic and surface current data. Comparing them, Ichikawa and Beardsley (1993) suggested that about one-half of the mean interior Sverdrup transport in the same latitude band may be flowing northeastward southeast of the Ryukyu Islands.…”

Section: Introductionmentioning

confidence: 99%

“…Ichikawa and Beardsley (1993) calculated the absolute volume transports of the Kuroshio in the ECS and those in the top 600 m layer southeast of Cape Toi by combined use of hydrographic and surface current data. Comparing them, Ichikawa and Beardsley (1993) suggested that about one-half of the mean interior Sverdrup transport in the same latitude band may be flowing northeastward southeast of the Ryukyu Islands. Sekine and Kutsuwada (1994) also suggested the existence of a northeastward current southeast of the Ryukyu Islands according to their two-layer numerical model.…”

Section: Introductionmentioning

confidence: 99%

Variability of Northeastward Current Southeast of Northern Ryukyu Islands

Ichikawa

Nakamura

Nishina

et al. 2004

Journal of Oceanography

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Interannual variability of the Kuroshio onshore intrusion along the East China Sea shelf break: Effect of the Kuroshio volume transport

et al. 2014

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The interannual variability of the Kuroshio onshore intrusion (KOI) across the East China Sea (ECS) shelf break and its response to the ECS Kuroshio volume transport (KVT) during 1993 $ 2010 are studied based on a high-resolution, real-time, and global ocean general circulation model. Since variability of KVT is mainly determined in the interior Pacific, it is rather a remote than a local factor for the local ECS KOI. On interannual time scales, KVT affects KOI not only in the net volume transport across the entire shelf break but also in the spatial pattern along the shelf break. When KVT increases, the intrusion decreases (increases) upstream (downstream) of the major intrusion region northeast of Taiwan, the retreating increases (decreases) upstream (downstream) of the main veering region southwest of Kyushu. These patterns are caused by cyclonic eddies induced by the seaward deflection of the Kuroshio axis from the shelf break, which ultimately results from the KVT increase. A diagnostic mechanism of KOI $ M sin ðhÞjrh 21 j is proposed, where h is the bottom depth, h is the angle between isobaths and the vertically averaged current, and M is the absolute volume transport at the shelf break. h is large in the major intrusion/retreating regions and stable on interannual time scales while M changes with opposite signs between upstream and downstream of the major intrusion/retreating regions. The mechanism explains well the relation of local KVT and the spatial pattern of KOI along the shelf break, in both the mean state and the interannual variations.

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Temporal and spatial variability of volume transport of the Kuroshio in the East China Sea

Cited by 137 publications

References 11 publications

Mechanism of the seasonal transport variation through the Tokara Strait

Mechanism of the seasonal transport variation through the Tokara Strait

Variability of Northeastward Current Southeast of Northern Ryukyu Islands

Interannual variability of the Kuroshio onshore intrusion along the East China Sea shelf break: Effect of the Kuroshio volume transport

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