Cross‐shelf exchange in the shelf of the <scp>E</scp>ast <scp>C</scp>hina <scp>S</scp>ea

Zhou, Feng; Xue, Huijie; Huang, Daji; Xuan, Jiliang; Ni, Xiaobo; Xiu, Peng; Hao, Qiang

doi:10.1002/2014jc010567

Cited by 90 publications

(104 citation statements)

References 98 publications

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“…also occur in the middle of the ECS associated with the action of frontal eddies [Yanagi et al, 1998;Isobe et al, 2004;Zhou et al, 2015].…”

Section: 1002/2016jc011972mentioning

confidence: 99%

“…Second, additional cross-shelf exchange locations in the middle of the ECS have been revealed by satellite remote sensing data [Liu and Gan, 2012]. Finally, recent numerical model simulations have predicted that other persistent water exchange regions exist along the shelf break between 26 N and 28 N [Guo et al, 2006;Zhou et al, 2015]. These simulation results have been further used to estimate the magnitude of the cross-shelf transport (CST) in the ECS.…”

Section: Introductionmentioning

confidence: 97%

“…This gave evidence that the Kuroshio can intrude onto the shelf as it passes along the eastern boundary of the ECS. Yang et al [2012] and Zhou et al [2015] studied the on-shelf intrusion of the Kuroshio and its impacts on the shelf hydrographic environment. Their findings indicate that the intruded Kuroshio water can reach the coast and change the local temperature and salinity.…”

Section: Introductionmentioning

confidence: 99%

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Cross‐shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement

et al. 2016

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Combining satellite altimetry and in situ hydrographic measurement, we estimated the cross‐shelf transport (CST) and its spatial and temporal variations across 200 m isobath in the East China Sea (ECS) from 1993 to 2014. The vertically integrated CST can be dynamically divided into three parts: surface Ekman transport, geostrophic transport, and bottom Ekman transport. The results show that the 22 year‐mean, sectionally integrated CST to be 1.7 ± 2.0 Sv (positive in the on‐shelf direction), comprised of bottom and surface Ekman transports of 2.7 ± 1.0 Sv and 0.6 ± 0.6 Sv, respectively, that are partially offset by a geostrophic transport of −1.5 ± 1.7 Sv. The sectionally integrated CST shows significantly high power at roughly annual period from 1999 to 2001, with lower power at intra‐annual period. The vertically integrated CST to the northeast of Taiwan is the main source of sectionally integrated CST. The vertically integrated CST also shows significant variations in the 6–15 month period band to the northeast of Taiwan as well. The temporal variations of the sectionally integrated and vertically integrated CST are both controlled primarily by geostrophic transport and modulated by bottom Ekman transport. In the upper 50 m, the geostrophic current to the northeast of Taiwan exhibits large mean and significant variability. The empirical orthogonal function analysis of vertical structure of geostrophic current shows two significant modes with strong annual signal. The first mode is associated with the migration of Kuroshio axis near Taiwan, while the second mode is associated with the variation of the meander of the Kuroshio to the northeast of Taiwan.

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“…also occur in the middle of the ECS associated with the action of frontal eddies [Yanagi et al, 1998;Isobe et al, 2004;Zhou et al, 2015].…”

Section: 1002/2016jc011972mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Cross‐shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement

et al. 2016

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“…This slope constrains the current to flow along f /h contours, where f is the Coriolis parameter and h is water depth, to conserve potential vorticity. However, variability in the Kuroshio's path here results in exchange across the shelf break between Kuroshio waters and shelf waters (e.g., Zhou et al, 2015). This exchange may be at least partially responsible for dramatic temperature increases on the East China Sea shelf: reconstructions of global sea surface temperatures (SSTs) suggest that the Kuroshio (and other subtropical western boundary currents) have warmed more rapidly than the global average rate of SST increase over the last century (Wu et al, 2012), and the neighboring East China Sea shelf is also a region of intense SST increase (see their Figure 1).…”

Section: Meanders and Intrusions Drive Exchangementioning

confidence: 99%

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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“…Wei et al (2013) demonstrated that the annual and interannual variations of the Kuroshio volume transport are large. In addition, Zhou et al (2015) pointed out that the annual and interannual variations of the Kuroshio intrusion northeast of Taiwan are prominent. X.…”

Section: Cross-shore Transport North Of Taiwan Induced By the Tscmentioning

confidence: 99%

Synoptic fluctuation of the Taiwan Warm Current in winter on the East China Sea shelf

et al. 2017

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Abstract. The seasonal mean and synoptic fluctuation of the wintertime Taiwan Warm Current (TWC) were investigated using a well-validated finite volume community ocean model. The spatial distribution and dynamics of the synoptic fluctuation were highlighted. The seasonal mean of the wintertime TWC has two branches: an inshore branch between the 30 and 100 m isobaths and an offshore branch between the 100 and 200 m isobaths. The Coriolis term is much larger than the inertia term and is almost balanced by the pressure gradient term in both branches, indicating geostrophic balance of the mean current. Two areas with significant fluctuations of the TWC were identified during wintertime. One of the areas is located to the north of Taiwan with velocities varying in the cross-shore direction. These significant crossshore fluctuations are driven by barotropic pressure gradients associated with the intrusion of the Taiwan Strait Current (TSC). When a strong TSC intrudes to the north of Taiwan, the isobaric slope tilts downward from south to north, leading to a cross-shore current from the coastal area to the offshore area. When the TSC intrusion is weak, the crossshore current to the north of Taiwan is directed from offshore to inshore. The other area of significant fluctuation is located in the inshore area between the 30 and 100 m isobaths. The fluctuations are generally strong both in the alongshore and cross-shore directions, in particular at the latitudes 26.5 and 28 • N. Wind affects the synoptic fluctuation through episodic events. When the northeasterly monsoon prevails, the southwestward Zhe-Min coastal current dominates the inshore area associated with a deepening of the mixed layer. When the winter monsoon is weakened or the southwesterly wind prevails, the northeastward TWC dominates in the inshore area.

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Cross‐shelf exchange in the shelf of the East China Sea

Cited by 90 publications

References 98 publications

Cross‐shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement

Cross‐shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement

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

Synoptic fluctuation of the Taiwan Warm Current in winter on the East China Sea shelf

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