Characteristics of water exchange in the Luzon Strait during September 2006

Zhou, Haihua; Nan, Feng; Shi, Maochong; Zhou, Liangming; Peifang, Guo

doi:10.1007/s00343-009-9175-2

Cited by 20 publications

(11 citation statements)

References 3 publications

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“…Below the thermocline, temperature and sound velocity decrease gradually with depth (Figures 4a and 4d), while density increases below the pycnocline (Figure 4c). Similar to the western Pacific water, there exists a salinity maximum (∼34.65 psu) at ∼150 m depth and a salinity minimum (∼34.45 psu) at ∼500 m depth in the northern SCS (Figures 3b and 4b), representing the North Pacific Subsurface Water and the North Pacific Intermediate Water, respectively [ Zhou et al , 2009]. The maximum sound velocity (∼1540 m s −1 ) is at the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Geostrophic velocities along the section are computed using the method in the work of Zhou et al [2009]. The formula is as follows: where ρ = ρ ( T , S , P ) is potential density, g is gravity acceleration, f is the Coriolis parameter, ρ 0 is mean potential density, and ν 0 is velocity at the reference level z 0 .…”

Section: Methodsmentioning

confidence: 99%

“…[9] Geostrophic velocities along the section are computed using the method in the work of Zhou et al [2009]. The formula is as follows:…”

Section: In Situ Data and Calculation Of Geostrophic Currentsmentioning

confidence: 99%

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Three long-lived anticyclonic eddies in the northern South China Sea

et al. 2011

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[1] In August 2007, three long-lived anticyclonic eddies (ACE1, ACE2, and ACE3) were detected by both satellite sea level anomaly (SLA) map and in situ measurements in the northern South China Sea (SCS). ACE3 had a two-core (ACE3(1) and ACE3(2)) structure. In situ stations along 18°N almost cut through the centers of ACE2 and ACE3 (2). Near the centers of ACE2 and ACE3(2), mean temperature and sound velocity are ∼0.65°C and ∼2 m s −1 larger than those in their surrounding areas, respectively, while mean salinity and density are ∼0.02 psu and ∼0.15 m 3 s −1 smaller than those in their surrounding areas due to downwelling near the eddy cores. The depths of maximum and minimum salinity near the eddy cores are ∼65 m and ∼35 m larger than those in their surrounding areas. The vertical depth with current speed larger than 0.05 m s −1 can reach ∼900 m. Their detailed evolutionary processes were depicted based on the variation of geostrophic currents and the trajectories of five drifting buoys. ACE1 lasted 147 days, while ACE2 and ACE3 lasted 168 days and 210 days, respectively. ACE1 had a smaller mean SLA (18.8 cm) in its lifetime than ACE2 (21.8 cm) and ACE3 (25.3 cm) but had a larger negative mean vorticity (−7.7 × 10 −6 s ). One short-lived anticyclonic eddy that split from ACE2 and another one that merged with ACE3 both had a smaller SLA, negative vorticity, and diameter than ACE2 and ACE3, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Three long-lived anticyclonic eddies in the northern South China Sea

et al. 2011

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“…Furthermore, there exist seasonal and inter-annual variations of the occurrence for the three paths (Fig. 5), which may be one reason that the observed transport through the LS in different seasons or in the same season of different years is greatly different (e.g., Xu and Su 2000;Giloson and Roemmich 2002;Tian et al 2006;Yuan et al 2008;Zhou et al 2009). …”

Section: More Flow Characteristics Associated With the Different Kuromentioning

confidence: 96%

“…The surface Kuroshio water can intrude deep into the SCS especially in winter (Centurioni et al 2004). In the LS, eastward and westward flows appear alternately (e.g., Nitani 1972;Zhou et al 2009). Estimates of the transport through the LS vary from a few Sv to more than 10 Sv (e.g., Xu and Su 2000;Giloson and Roemmich 2002;Qu et al 2006;Tian et al 2006;Yuan et al 2008).…”

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confidence: 97%

Identification of different types of Kuroshio intrusion into the South China Sea

et al. 2011

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Kuroshio intrusion into the South China Sea (SCS) has different forms. In this study, a Kuroshio SCS Index (KSI) is defined using the integral of geostrophic vorticity from 118°to 121°E and from 19°to 23°N. Three typical paths (the looping path, the leaking path, and the leaping path) were identified based on the KSI derived from the weekly satellite Absolute Dynamic Topography from 1993 to 2008. The KSI has a near normal distribution. Using ±1 standard deviation (σ) as the thresholds, the leaking path is the most frequent form with the probability of occurrence at 68.2%, while the probabilities of occurrence for the looping path and the leaping path are 16.4% and 15.4%, respectively. Similar analysis is also conducted on the daily Hybrid Coordinate Ocean Model (HYCOM) Global Analysis from 2004 to 2008. The results are generally consistent with the KSI analysis of the satellite data. The HYCOM data are further analyzed to illustrate patterns of inflows/outflows and the maximum/minimum salinity as representatives of the subsurface/intermediate waters. The Kuroshio bending and the net inflow through the Luzon Strait reduce from the looping path to the leaking path to the leaping path. However, the Kuroshio subsurface water intrudes farthest into the SCS for the leaking path. Vorticity budget associated with the different intrusion types is then analyzed. The tilting of the relative vorticity, the stretching of the absolute vorticity, and the advection of planetary vorticity are important for the change of vorticity, whereas the baroclinic and frictional contributions are three orders smaller.

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The Characteristics of Large-Scale Circulation Dynamics in the South China Sea

Wang

2022

Ocean Circulation and Air-Sea Interaction in the South China Sea

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Characteristics of water exchange in the Luzon Strait during September 2006

Cited by 20 publications

References 3 publications

Three long-lived anticyclonic eddies in the northern South China Sea

Three long-lived anticyclonic eddies in the northern South China Sea

Identification of different types of Kuroshio intrusion into the South China Sea

The Characteristics of Large-Scale Circulation Dynamics in the South China Sea

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