Influence of intermediate water in the western Okinawa Trough by the outflow from the South China Sea

Chen, Chen‐Tung Arthur; Wang, Shu-Lun

doi:10.1029/98jc00366

Cited by 79 publications

(70 citation statements)

References 14 publications

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“…A branch of the Kuroshio water continues westward and enters the SCS along the western boundary. Based on the satellite-tracked Argo surface drifter data for the period 1998-2002, Centurioni et al (2004 reported similar results. Some drifters were clearly shown to cross Luzon Strait and reach the interior of the SCS in October-January.…”

Section: Introductionsupporting

confidence: 68%

“…In the southern and northern parts of the western area, the temperature is lower, but salinity is higher, resulting in a relatively high density. Salinity is highest in the western area and lowest in the eastern area, consistent with the contrast in properties in intermediate water between the Pacific and the SCS (e.g., Chen & Wang, 1998;Qu, 2002). Figures 6a and 6b show the temperature-salinity (T-S) diagram for the stations at the southern and northern boundaries of the region.…”

Section: Results From Observations a Windmentioning

confidence: 54%

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Currents in Luzon Strait Obtained from CTD and Argo Observations and a Diagnostic Model in October 2008

et al. 2012

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On the basis of Acoustic Doppler Current Profiler (ADCP) measurements of current and hydrographic data obtained in October 2008, a diagnostic model of ocean circulation with a modified inverse method is used to study the circulation in Luzon Strait. Satellite-based geostrophic velocity calculated from the merged absolute dynamic topography is also used and compared with the in situ data. The analyses reveal that during the period of observations there were two branches of the Kuroshio current, and the maximum velocity of the current reached 175 cm s −1 at the surface. The main stream of the Kuroshio was located at 122°10 ′ E to 122°40 ′ E near the southern boundary of the study region and confined to the upper 700 m, while its western branch was located at 121°00 ′ E to 121°35 ′ E and confined to the upper 400 m. The Kuroshio water intruded into the South China Sea through the northern boundary of the study region east of 120°45 ′ E. At 1000 m depth, the flow was dominated by southwestward or westward flow in the area north of 20°30 ′ N, while the flow was mostly southeastward in the area south of 20°30 ′ N. A cyclonic eddy was identified in the region east of Luzon Strait. At 1500 m depth, cyclonic eddies were seen on both sides of Luzon Strait. The volume transport across the longitudinal section 120°45′ E between about 20.00°N and 21.20°N south of Taiwan during the period of observations was about 4 × 10 6 m 3 s −1 . One Argo float was tracked as it moved across Luzon Strait, reflecting the westward flow at both the surface and 1000 m depth.RÉSUMÉ [Traduit par la rédaction] En partant des mesures de courant par profileur de courant à effet Dopler (ADCP) et des données hydrographiques recueillies en octobre 2008, nous étudions la circulation dans le détroit de Luçon en nous servant d'un modèle diagnostique de la circulation de l'océan combiné à une méthode inverse modifiée. Nous nous servons également de la vélocité géostrophique mesurée par satellite, calculée à partir de la topographie dynamique absolue totale, pour la comparer avec les données in situ. Les analyses révèlent que pendant la période d'observation, il y avait deux ramifications du Kuroshio et que la vélocité maximale du courant a atteint 175 cm s −1 à la surface. La principale ramification du Kuroshio était située entre 122°10 ′ E et 122°40 ′ E à proximité de la limite sud de la région à l'étude et elle était confinée aux 700 premiers mètres; sa ramification ouest était située entre 121°00 ′ E et 121°35 ′ E et elle était confinée aux 400 premiers mètres. Le Kuroshio se déversait dans la mer de Chine occidentale en traversant la limite nord de la région à l'étude à l'est de 120°45 ′ E. À 1000 m de profondeur, le courant s'écoulait essentiellement en direction sud-ouest ou ouest dans le secteur au nord . Nous avons suivi une bouée Argo dérivant au gré du courant dans le détroit de Luçon, ce qui a permis d'établir qu'il s'écoulait en direction ouest à la surface et à une profondeur de 1000 m.

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Section: Introductionsupporting

confidence: 68%

Section: Results From Observations a Windmentioning

confidence: 54%

Currents in Luzon Strait Obtained from CTD and Argo Observations and a Diagnostic Model in October 2008

et al. 2012

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“…5b). Moreover, an oceanic mechanism that links surface productivity in the East China Sea by varying fresh water flux from Yangtze River runoff has been proposed , Chen and Wang 1998, Chen and Wang 1999. The increased freshwater flux from the Yangtze River would induce upwelling of nutrient-enriched Kuroshio Intermediate Water generated from the South China Sea (Chen and Wang 1998).…”

Section: Total Organic Carbon Recordsmentioning

confidence: 99%

Foraminiferal Oxygen Isotope Stratigraphy and High-Resolution Organic Carbon, Ca rbonate Records from the Okinawa Trough (IMAGES MD012404 and ODP Site 1202)

Chang¹,

Wu²,

Wei³

et al. 2005

Terr. Atmos. Ocean. Sci.

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“…In this case, using separate GEMs on each side of the front strongly reduces the GEM rms error, improves the thermocline depth determination, and ensures a more accurate reproduction of the baroclinic current structure. This procedure is particularly relevant along the Kuroshio path, as South China Sea waters interact with the North Pacific waters from the Luzon Strait to the east of Taiwan, the Okinawa trough, and even as far as southern Japan (Chen 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Between ;100 and ;300 m, South China Sea Tropical Water (SCSTW) is colder and fresher than the North Pacific Tropical Water (NPTW) transported by the Kuroshio (Mensah et al 2014). Conversely, between 400 and 800 m, South China Sea Intermediate Water (SCSIW) is saltier than the North Pacific Intermediate Water (NPIW) (Chen and Wang 1998;Chen 2005;Mensah et al 2015) and slightly warmer below 600 m (Figs. 3a and 3b).…”

Section: ) Error Sources In the Standard Processmentioning

confidence: 99%

Combining Observations from Multiple Platforms across the Kuroshio Northeast of Luzon: A Highlight on PIES Data

Mensah

Andres

Lien

et al. 2016

Journal of Atmospheric and Oceanic Technology

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This study presents amended procedures to process and map data collected by pressure-sensor-equipped inverted echo sounders (PIESs) in western boundary current regions. The modifications to the existing methodology, applied to observations of the Kuroshio from a PIES array deployed northeast of Luzon, Philippines, consist of substituting a hydrography-based mean travel time field for the PIES-based mean field and using two distinct gravest empirical mode (GEM) lookup tables across the front that separate water masses of South China Sea and North Pacific origin. In addition, this study presents a method to use timemean velocities from acoustic Doppler current profilers (ADCPs) to reference (or ''level'') the PIESrecorded pressures in order to obtain time series of absolute geostrophic velocity. Results derived from the PIES observations processed with the hydrography-based mean field and two GEMs are compared with hydrographic profiles sampled by Seagliders during the PIES observation period and with current velocity measured concurrently by a collocated ADCP array. The updated processing scheme leads to a 41% error decrease in the determination of the thermocline depth across the current, a 22% error decrease in baroclinic current velocity shear, and a 61% error decrease in baroclinic volume transports. The absolute volume transport time series derived from the leveled PIES array compares well with that obtained directly from the ADCPs with a root-mean-square difference of 3.0 Sv (1 Sv [ 10 6 m 3 s -1 ), which is mainly attributed to the influence of ageostrophic processes on the ADCP-measured velocities that cannot be calculated from the PIES observations.

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Influence of intermediate water in the western Okinawa Trough by the outflow from the South China Sea

Cited by 79 publications

References 14 publications

Currents in Luzon Strait Obtained from CTD and Argo Observations and a Diagnostic Model in October 2008

Currents in Luzon Strait Obtained from CTD and Argo Observations and a Diagnostic Model in October 2008

Foraminiferal Oxygen Isotope Stratigraphy and High-Resolution Organic Carbon, Ca rbonate Records from the Okinawa Trough (IMAGES MD012404 and ODP Site 1202)

Combining Observations from Multiple Platforms across the Kuroshio Northeast of Luzon: A Highlight on PIES Data

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