Southward recirculation of the East China Sea Kuroshio west of Okinawa Island

Hisaki, Yukiharu; Imadu, Chika

doi:10.1029/2008jc004943

Cited by 7 publications

(3 citation statements)

References 28 publications

(38 reference statements)

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“…This means that more complicated dynamics are responsible for the seasonal variability of the Kuroshio Current at the PN section. Hisaki and Imadu (2009) suggested that the counter current on the right side of Kuroshio was controlled by bottom topography and was sometimes enhanced due to variability of the local wind stress curl. These studies suggest that the seasonal variability of the Kuroshio Current at the PN Section is related to both North Pacific basin scale wind stress variability and local wind stress variability; however, other factors such as the cooling effect can also play important roles (Oey et al, 2010).…”

Section: Discussionmentioning

confidence: 97%

Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

Wei

Pei

2015

Acta Oceanol. Sin.

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As the spatio-temporal variability of the Kuroshio is highly influenced by mesoscale eddies, representing its seasonal variability characteristics requires sufficiently long term observations to reduce the uncertainties. Geostrophic velocity data estimated from hydrographic observation from 1987 to 2010 and the shipboard ADCP velocity data from 1993 to 2008 at the PN Section in the central East China Sea are collected to view the seasonal variability objectively. From both types of observation, it is found that the seasonal climatology mean of the Kuroshio Current exhibits significant difference in three areas, which are located at the Kuroshio Current core and its two flanks in a shallow layer less than 300 m, with the weakest northeast current at the core in autumn, the strongest counter current on the right flank in spring, and the strongest northeast current on the left flank in autumn, respectively. The seasonal variance of the Kuroshio Current also exhibits significant difference on the offshore side of the Kuroshio, with larger variance in spring and summer while smaller variance in autumn and winter. For the current parallel to the PN Section, the ratio of the seasonal variability component to the intraseasonal variability component is relatively smaller than that for the current perpendicular to the PN Section. Further analyses indicate that the seasonal variability at the PN Section is tightly linked to the upstream and downstream current variability.

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Section: Discussionmentioning

confidence: 97%

Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

Wei

Pei

2015

Acta Oceanol. Sin.

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“…Although the RUC is largely responsible for poleward heat transport, its contribution to the maintenance of marine ecosystem in the Nansei Archipelago is not substantial because the RUC's main body is situated at ~600 m below the surface (Ichikawa et al, ) where larvae and spawn of marine fauna are rare. The third mechanism is due to the transverse advective effects associated with the Kuroshio Counter Current, which often develops between the archipelago and the Kuroshio (e.g., Hisaki & Imadu, ; Ichikawa & Beardsley, ; Qiu & Imasato, , and references therein). The KCC manifests as a quasi‐persistent southwestward current with pronounced appearance of mesoscale eddies, extracting water from the Kuroshio, and transporting it toward the west coast of the archipelago.…”

Section: Introductionmentioning

confidence: 99%

Influences of the Kuroshio on Interisland Remote Connectivity of Corals Across the Nansei Archipelago in the East China Sea

et al. 2018

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For the preservation and protection of coral habitats along the Nansei Archipelago in the East China Sea, a submesoscale eddy‐resolving synoptic ocean model was developed based on the Regional Oceanic Modeling System coupled with a 3‐D Lagrangian particle tracking model. Millions of neutrally buoyant particles representing coral spawn and larvae were released from 19 major islands and one lagoon every spring from 2012 to 2015. The model results were compared to satellite data, in situ observation, and surface drifters to confirm reasonable agreement. The connectivity matrix across the archipelago was quantified using Lagrangian probability density functions of the modeled particle displacement. Most particles remained near the release areas, while some traveled long distances by the northeastward drifting Kuroshio, leading to notable interisland coral transport across the archipelago that promotes interisland connectivity. A possible mechanism was examined by analyzing the transition from coastal to pelagic transport of the particles released from the Yaeyama Islands, the southernmost area of the archipelago. The Kuroshio trapped the particles released from the northern coast of the islands with considerable temporal variability in the entrainment rate. By contrast, particles released from the southern coast are markedly affected by the eastward current around the release sites, which significantly reduces their entrainment in the Kuroshio and, thus, long‐distance transport. Some entrained particles were expelled abruptly from the Kuroshio, trapped by the southwestward drifting Kuroshio Counter Current developed between the Kuroshio and the archipelago, and subsequently transported eastward to the islands.

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“…Examples abound on the U.S. Pacific coast (e.g., Barrick et al 1977;Paduan and Cook 1997;Lipphardt et al 2000;Nishimoto and Washburn 2002;Beckenbach and Washburn 2004;Kosro 2005;Roughan et al 2005;Kaplan et al 2009;Kim et al 2009), the U.S. Atlantic coast (e.g., Shay et al 2002Shay et al , 2008Graber et al 1996;Marmorino et al 1999;Haus et al 2000;Chant et al 2004;Kohut et al 2008;Roarty et al 2008;Dzwonkowski et al 2009;Parks et al 2009), the European coastal seas (e.g., Prandle and Ryder 1985;Gurgel et al 1999;Kovacevic et al 2004;Cosoli et al 2005;Abascal et al 2009;Gacic et al 2009;Molcard et al 2009;Sentchev et al 2009), and the Asian marginal seas (e.g., Takeoka et al 1995;Yang et al 2005;Ebuchi et al 2006;Yoshikawa et al 2007;Ichikawa et al 2008;Zhu et al 2008;Hisaki and Imadu 2009;Takahashi et al 2009). Applications are now found over much of the world's coastal oceans.…”

Section: Introductionmentioning

confidence: 99%

HF Radar Performance in a Low-Energy Environment: CODAR SeaSonde Experience on the West Florida Shelf*

Liu

Weisberg

Merz

et al. 2010

Journal of Atmospheric and Oceanic Technology

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Three long-range (5 MHz) Coastal Ocean Dynamics Application Radar (CODAR) SeaSonde HF radars overlooking an array of as many as eight moored acoustic Doppler current profilers (ADCPs) have operated on the West Florida Shelf since September 2003 for the purpose of observing the coastal ocean currents. HF radar performance on this low-energy (currents and waves) continental shelf is evaluated with respect to data returns, the rms differences between the HF radar and the ADCP radial currents, bearing offsets, and radial velocity uncertainties. Possible environmental factors affecting the HF radar performance are discussed, with the findings that both the low-energy sea state and the unfavorable surface wave directions are the main limiting factors for these HF radar observations of currents on the WFS. Despite the challenge of achieving continuous backscatter from this low-energy environment, when acquired the data quality is good in comparison with the ADCP measurements. The rms differences range from 6 to 10 cm s 21 for hourly and from 3 to 6 cm s 21 for 36-h low-pass-filtered radial currents, respectively. Bearing offsets are in the range from 2158 to 198. Coherent variations of the HF radar and ADCP radial currents are seen across both tidal and subtidal frequency bands. By examining the HF radar radial velocities at low wave energy, it is found that the data returns decrease rapidly for significant wave heights smaller than 1 m, and that the rms differences between the HF radar and ADCP radials are degraded when the significant wave height is smaller than 0.3 m.* Center for Prediction of Redtide Contribution Number 7.

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Southward recirculation of the East China Sea Kuroshio west of Okinawa Island

Cited by 7 publications

References 28 publications

Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

Influences of the Kuroshio on Interisland Remote Connectivity of Corals Across the Nansei Archipelago in the East China Sea

HF Radar Performance in a Low-Energy Environment: CODAR SeaSonde Experience on the West Florida Shelf*

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