Anticyclonic rings from the Kuroshio in the South China Sea

Li, Li; Nowlin, Worth D.; Su, Jilan

doi:10.1016/s0967-0637(98)00026-0

Cited by 207 publications

(165 citation statements)

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“…Domain C covered a large portion of the SCS basin and is characterized by a tropical oligotrophic environment (Ning et al, 2004). Domain D was located west of the Luzon Strait and was impacted by the Kuroshio intrusions, which generate various mesoscale eddies and internal waves (e.g., Li et al, 1998;Yuan et al, 2006;Chen et al, 2007a;Sheu et al, 2010a). We must point out that beyond the four domains that the present study is examining, other physicalbiogeochemical processes may dominate.…”

Section: W-d Zhai Et Al: Seasonal Variations Of Sea-air Co 2 Fluxementioning

confidence: 90%

Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

et al. 2013

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Abstract. Based upon 14 field surveys conducted between 2003 and 2008, we showed that the seasonal pattern of sea surface partial pressure of CO 2 (pCO 2 ) and sea-air CO 2 fluxes differed among four different physicalbiogeochemical domains in the South China Sea (SCS) proper. The four domains were located between 7 and 23 • N and 110 and 121 • E, covering a surface area of 1344 × 10 3 km 2 and accounting for ∼ 54 % of the SCS proper. In the area off the Pearl River estuary, relatively low pCO 2 values of 320 to 390 µatm were observed in all four seasons and both the biological productivity and CO 2 uptake were enhanced in summer in the Pearl River plume waters. In the northern SCS slope/basin area, a typical seasonal cycle of relatively high pCO 2 in the warm seasons and relatively low pCO 2 in the cold seasons was revealed. In the central/southern SCS area, moderately high sea surface pCO 2 values of 360 to 425 µatm were observed throughout the year. In the area west of the Luzon Strait, a major exchange pathway between the SCS and the Pacific Ocean, pCO 2 was particularly dynamic in winter, when northeast monsoon induced upwelling events and strong outgassing of CO 2 . These episodic events might have dominated the annual sea-air CO 2 flux in this particular area. The estimate of annual sea-air CO 2 fluxes showed that most areas of the SCS proper served as weak to moderate sources of the atmospheric CO 2 , with sea-air CO 2 flux values of 0.46 ± 0.43 mol m −2 yr −1 in the northern SCS slope/basin, 1.37 ± 0.55 mol m −2 yr −1 in the central/southern SCS, and 1.21 ± 1.48 mol m −2 yr −1 in the area west of the Luzon Strait. However, the annual sea-air CO 2 exchange was nearly in equilibrium (−0.44 ± 0.65 mol m −2 yr −1 ) in the area off the Pearl River estuary. Overall the four domains contributed (18 ± 10) × 10 12 g C yr −1 to the atmospheric CO 2 .

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Section: W-d Zhai Et Al: Seasonal Variations Of Sea-air Co 2 Fluxementioning

confidence: 90%

Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

et al. 2013

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“…The structure, generation and dissipation mechanisms of the cold eddies in the northern SCS were mainly discussed based on mooring and altimetry data in the literature. Li et al [48] showed the existence of an anti-cyclonic warm eddy in the northern SCS using in-situ conductivity-temperature-depth (CTD) data, and the Argos drifter rotated around the eddy for four cycles after leaving the Luzon Island in winter 1993. There are different theories for variation mechanism of the eddies in the northern SCS; e.g.…”

Section: Interannual Variability Of the Scswbcmentioning

confidence: 99%

“…There are different theories for variation mechanism of the eddies in the northern SCS; e.g. the anti-cyclonic eddies (AEs) shed from the Kuroshio branch [48][49][50], which intrudes into the SCS and changes the local circulation, and those due to the instability of the Kuroshio, which results in the shedding and westward moving of AEs [51,52]. However, some other studies pointed out that not all observations supported the view of water intrusion asso-ciated with the Kuroshio branch, and thus the Kuroshio water is not the main reason for the formation of the AEs [53].…”

Section: Interannual Variability Of the Scswbcmentioning

confidence: 99%

“…Two regions of strong meso-scale eddies exist in the SCS: one along the SCSWBC, and the other across the central SCS from southwest to northeast [58]. Sometimes, the circulation in the northern SCS is mainly influenced by the Kuroshio intrusion [63,64], and most of the meso-scale eddies are formed by the Kuroshio intrusion [48][49][50][51][52]. The sub-surface temperature is affected by the westward propagation of eddies, and shows obvious intra-seasonal variation [65].…”

Section: Interaction Between Scswbc and Eddiesmentioning

confidence: 99%

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Progress of regional oceanography study associated with western boundary current in the South China Sea

et al. 2013

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Recent progress of physical oceanography in the South China Sea (SCS) associated with the western boundary current (WBC) and eddies is reviewed in this paper. It includes Argo observations of the WBC, eddy detection in the WBC based on satellite images, cross-continental shelf exchange in the WBC, eddy-current interaction, interannual variability of the WBC, air-sea interaction, the SCS throughflow (SCSTF), among others. The WBC in the SCS is strong, and its structure, variability and dynamic processes on seasonal and interannual time scales are yet to be fully understood. In this paper, we summarize progresses on the variability of the WBC, eddy-current interaction, air-sea interaction, and the SCSTF achieved in the past few years. Firstly, using the drifting buoy observations, we point out that the WBC becomes stronger and narrower after it reaches the central Vietnam coast. The possible mechanisms influencing the ocean circulation in the northern SCS are discussed, and the dynamic mechanisms that induce the countercurrent in the region of northern branch of WBC in winter are also studied quantitatively using momentum balance. The geostropic component of the WBC was diagnosed using the ship observation along 18°N, and we found that the WBC changed significantly on interannual time scale. Secondly, using the ship observations, two anti-cyclonic eddies in the winter of 2003/2004 in the northern SCS, and three anti-cyclonic eddies in the summer of 2007 along 18°N were studied. The results show that the two anti-cyclonic eddies can propagate southwestward along the continental shelf at the speed of first Rossby wave (~0.1 m s 1 ) in winter, and the interaction between the three anti-cyclonic eddies in summer and the WBC in the SCS is preliminarily revealed. Eddies on the continental shelf of northern SCS propagated southeastward with a maximum speed of 0.09 m s 1 , and those to the east of Vietnam coast had the largest kinetic energy, both of which imply strong interaction between eddy activity and WBC in the SCS. Thirdly, strong intraseasonal variability (ISV) of sea surface temperature (SST) near the WBC regions was found, and the ISV signal of SST in winter weakens the ISV signal of latent heat flux by 20%. Fourthly, the long-term change of SCSTF volume transport and its connection with the ocean circulation in the Pacific were discussed.South China Sea, western boundary current, eddy, eddy-current interaction, intraseasonal variability, South China Sea thoughflow Citation:Wang D X, Liu Q Y, Xie Q, et al. Progress of regional oceanography study associated with western boundary current in

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“…Near the Luzon Strait, Li et al (1998) record the evidence of anticyclonic eddies in the NSCS and treat the eddies as Kuroshio origin. Although strong 3-6 months MV exists both in the NSCS and the western Pacific (Hu et al, 2001), Kuroshio appears to act as a barrier to the westward propagations of MV from the Pacific and only 45-day MV could enter the SCS via the Luzon Strait (Li et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Pathways of mesoscale variability in the South China Sea

Zhuang

Wang

et al. 2010

Chin. J. Ocean. Limnol.

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Anticyclonic rings from the Kuroshio in the South China Sea

Cited by 207 publications

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Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

Progress of regional oceanography study associated with western boundary current in the South China Sea

Pathways of mesoscale variability in the South China Sea

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Anticyclonic rings from the Kuroshio in the South China Sea

Cited by 207 publications

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Seasonal variations of sea–air CO&lt;sub&gt;2&lt;/sub&gt; fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

Seasonal variations of sea–air CO&lt;sub&gt;2&lt;/sub&gt; fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

Progress of regional oceanography study associated with western boundary current in the South China Sea

Pathways of mesoscale variability in the South China Sea

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Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements

Seasonal variations of sea–air CO<sub>2</sub> fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements