Study of the Kuroshio/Ryukyu Current system based on satellite-altimeter and in situ measurements

Andres, Magdalena; Park, Jae Hun; Wimbush, Mark; Zhu, Xiao‐Hua; Chang, Kyung‐Il; Ichikawa, Hiroshi

doi:10.1007/s10872-008-0077-2

Cited by 97 publications

(91 citation statements)

References 41 publications

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“…Yang et al (1999) showed that an approaching anticyclonic/cyclonic eddy increased/decreased the Kuroshio transport. Their conclusion is supported by Andres et al (2008a) who examined direct transport measurements during several eddy events. Zhang et al (2001), on the other hand, suggested that the impinging anticyclonic eddies caused a decrease of the ETC transport.…”

Section: Discussionmentioning

confidence: 71%

“…There were other studies that utilized direct velocity/transport measurements. Andres et al (2008a) illustrated three events of the approaching anticyclonic (cyclonic) eddies that increased (decreased) the transports in the ECS through the Kerama Gap. Also, Zhu et al (2004) showed that the approaching anticyclonic/cyclonic eddies increased/decreased the volume transport southeast of Okinawa Island.…”

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confidence: 99%

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The mesoscale eddies and Kuroshio transport in the western North Pacific east of Taiwan from 8-year (2003–2010) model reanalysis

Lee

Wang

et al. 2013

Ocean Dynamics

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The relationship between the Kuroshio volume transport east of Taiwan (~24°N) and the impinging mesoscale eddies is investigated using 8-year reanalysis of a primitive equation ocean model that assimilates satellite altimetry and SST data. The mean and fluctuations of the model Kuroshio transport agree well with the available observations. Analysis of model dynamic heights and velocity fields reveals three dominant eddy modes. The first mode describes a large eddy of~500 km in diameter, centered at 22°N. The second mode describes a pair of the north-south counter-rotating eddies of~400 km in diameter each, centered at 23°and 20°N, respectively. The third mode describes a pair of the east-west counter-rotating eddies of~300 km in diameter each, centered at 21°N. The associated velocity fields indicate eddies extending to 600-700 m in depth with vertical shears concentrated in the upper 400 m. All three modes and the model Kuroshio transport have similar dominant timescales of 70-150 days and generally are coherent. The decreased Kuroshio volume transports typically are associated with the impinging cyclonic eddies and the increased transports with the anticyclonic eddies. Selected drifter trajectories are presented to illustrate the three eddy modes and their correspondence with the varying Kuroshio transports.

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Section: Discussionmentioning

confidence: 71%

mentioning

confidence: 99%

The mesoscale eddies and Kuroshio transport in the western North Pacific east of Taiwan from 8-year (2003–2010) model reanalysis

Lee

Wang

et al. 2013

Ocean Dynamics

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“…3c). This is a well-known feature of the Ryukyu Current (Zhu et al, 2004), which is a branch current of the Kuroshio in the East China Sea (Andres et al, 2008). Although it is not very clear in Fig.…”

Section: Current Fields At the Five Sectionsmentioning

confidence: 88%

Spatial variations in the Kuroshio nutrient transport from the East China Sea to south of Japan

Guo

Zhu²,

Yu³

et al. 2013

Biogeosciences

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Abstract. Based on absolute geostrophic velocity, which was calculated using repeated hydrographic data of 39 cruises from 2000 to 2009 and nitrate concentrations measured in the same areas from 1964 to 2009, we obtained the temporally averaged nitrate flux (the product of velocity and nitrate concentration) and nitrate transport (integration of flux over one section) of four sections across the Kuroshio from the East China Sea (sections PN and TK) to an area south of Japan (sections ASUKA and 137E). In addition, we examined section OK east of the Ryukyu Islands in order to understand how the Ryukyu Current contributes to the

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“…Vertically integrated transport of the ECS-Kuroshio near 28°N (KT) is available at 10-day interval through calibration of satellite altimetry data with net absolute transport determined using 13 months of in situ measurements from pressure-sensorequipped inverted echo sounders (PIESs), ADCPs, current meters, and hydrocasts [Andres et al, 2008a[Andres et al, , 2008b. A similar vertically integrated transport time series has been determined for the Ryukyu Current near 26°N, RT [Zhu et al, 2004].…”

Section: Datamentioning

confidence: 99%

Manifestation of the Pacific Decadal Oscillation in the Kuroshio

Andres¹,

Park²,

Wimbush³

et al. 2009

Geophysical Research Letters

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Pacific Decadal Oscillation (PDO) index is strongly correlated with vertically integrated transport carried by the Kuroshio through the East China Sea (ECS). Transport was determined from satellite altimetry calibrated with in situ data and its correlation with PDO index (0.76) is highest at zero lag. Total PDO‐correlated transport variation carried by the ECS‐Kuroshio and Ryukyu Current is about 4 Sv. In addition, PDO index is strongly negatively correlated, at zero lag, with NCEP wind‐stress‐curl over the central North Pacific at ECS latitudes. Sverdrup transport, calculated from wind‐stress‐curl anomalies, is consistent with the observed transport variations. Finally, PDO index and ECS‐Kuroshio transport are each negatively correlated with Kuroshio Position Index in the Tokara Strait; this can be explained by a model in which Kuroshio path is steered by topography when transport is low and is inertially controlled when transport is high.

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Study of the Kuroshio/Ryukyu Current system based on satellite-altimeter and in situ measurements

Cited by 97 publications

References 41 publications

The mesoscale eddies and Kuroshio transport in the western North Pacific east of Taiwan from 8-year (2003–2010) model reanalysis

The mesoscale eddies and Kuroshio transport in the western North Pacific east of Taiwan from 8-year (2003–2010) model reanalysis

Spatial variations in the Kuroshio nutrient transport from the East China Sea to south of Japan

Manifestation of the Pacific Decadal Oscillation in the Kuroshio

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