Overview of the multi-layer circulation in the South China Sea

Zhu, Yaohua; Sun, Jiaqiang; Wang, Yonggang; Li, Shujiang; Xu, Tengfei; Wei, Zexun; Qu, Tangdong

doi:10.1016/j.pocean.2019.04.001

Cited by 76 publications

(42 citation statements)

References 71 publications

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“…In the North Natuna Sea, the cyclonic eddy occur from the surface layer to the deep/bottom layer. As reported by Zhu et al (2019), an eddy with sandwiched circulation occurs in the South China Sea connected to Luzon Strait i.e., anticyclonic in the intermediate layer and cyclonic in the upper and deeper layers, However, the spatio-temporal pattern and the driving mechanisms of the the sandwich circulation remain unclear. These become interesting topics for future studies.…”

Section: Seasonal Variation Of Nocmentioning

confidence: 88%

“…Later on, the investigation of circulation pattern by using observational data and numerical models only focus at the South China Sea and mostly on the surface layer. (Guohong et al, 2005;Gan et al, 2006;Wang et al, 2006b;Fang et al, 2009;Tangang et al, 2011;Wei et al, 2016;and Zhu et al, 2019) which made the investigation of NOC was missed in their study. Thus, the vertical variability of NOC has not been well-documented yet.…”

Section: Introductionmentioning

confidence: 99%

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Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

et al. 2021

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During the northwest monsoon (NWM), southerly flow off the Natuna Islands appeared as the extension of the turning Vietnam coastal jet, known as Natuna off-shelf current (NOC). NOC is generated by the interaction of wind stress and the North Natuna Sea’s bottom topography. The purposes of the present study is to investigate the vertical variability of NOC and its relation to El Niňo Southern Oscillation (ENSO) using Marine Copernicus reanalysis data. The vertical variability refers to the spatial distribution of NOC pattern at the surface layer, thermocline layer, and deep/bottom layer. in 2014 as representative of normal ENSO condition. To investigate the effect of ENSO, the spatial distribution of NOC in 2011 and 2016 were compared which represent the La Niňa and El Niňo conditions, respectively. The results show that NOC starts to generate at the southeast monsoon season to the transition I season and peaks in the northwest monsoon season. The occurrence of NOC is identified at all depth layers with the weakened NOC at the deep layer. Related to the ENSO effect, La Niňa tends to strengthen NOC while El Niňo tends to weaken NOC. These are releted with the strengthening and weakening northerly wind speed during La Niňa and El Niňo, Respectively. During La Niňa events, the NOC occurs more frequently than during El Niňo. Thus, beside affecting the magnitude of NOC, ENSO also influence the frequency occurrence of NOC.

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Section: Seasonal Variation Of Nocmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

et al. 2021

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“…Circulation on the northern SCS margin is characterized by three layers of western boundary currents (WBCs), i.e., the upper layer cyclonic (<500-1000 m water depth), the intermediate anticyclonic, and the deep cyclonic (>2000 m water depth) WBCs (Wang et al, 2011;Zhou et al, 2017;Zhu et al, 2019). Shelf-parallel currents also occur, including the Guangdong Coastal Current in the nearshore area, and the SCS Warm Current (SCSWC) mainly between the 200 and 400 m isobaths in the outer shelf to shelf-break zone (Fig.…”

Section: Background and Methodsmentioning

confidence: 99%

Transport and accumulation of plastic litter in submarine canyons—The role of gravity flows

Zhong

Peng

2021

Geology

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Manned submersible dives discovered plastic litter accumulations in a submarine canyon located in the northwestern South China Sea, ~150 km from the nearest coast. These plastic-dominated litter accumulations were mostly concentrated in two large scours in the steeper middle reach of the canyon. Plastic particles and fragments generally occurred on the upstreamfacing sides of large boulders and other topographic obstacles, indicating obstruction during down-valley transportation. Most of the litter accumulations were distributed in the up-valley dipping slopes downstream of the scour centers. This pattern is tentatively linked to turbidity currents, which accelerated down the steep upstream slopes of the scours and underwent a hydraulic jump toward the scour centers before decelerating on the upstream-facing flank. Associated seabed sediment consisted of clayey and sandy silts, with unimodal or bimodal grain-size distributions, which are typical for turbidites. The focused distribution of the litter accumulations is therefore linked to turbidity currents that episodically flush the canyon. Our findings provide evidence that litter dispersion in the deep sea may initially be governed by gravity flows, and that turbidity currents efficiently transfer plastic litter to the deeper ocean floor.

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“…It is generally suggested that the SCS contains three-layers of western boundary currents (WBC), which are the upper layer, the intermediate, and the deep WBCs, respectively (Su, 2004;Wang et al, 2011;Tian and Qu, 2012;Zhou et al, 2017;Wang et al, 2019;Zhu et al, 2019). On the northern SCS margin, the upper layer and deep WBCs are cyclonic and flow southwestward, while the intermediate WBC is anticyclonic and flows northeastward (Fig.…”

Section: Oceanographical Backgroundmentioning

confidence: 99%

Supplemental Material: Transport and accumulation of plastic litter in submarine canyons—The role of gravity flows

Zhong¹,

Peng²

2021

Preprint

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Overview of the multi-layer circulation in the South China Sea

Cited by 76 publications

References 71 publications

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

Transport and accumulation of plastic litter in submarine canyons—The role of gravity flows

Supplemental Material: Transport and accumulation of plastic litter in submarine canyons—The role of gravity flows

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