The extension of the ~3500 km shallow shelf current along the South China Sea: A review
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Abstract: Using literature published from 2010 onwards, this study investigates the ~
3500 km extension of the shallow shelf current in the South China Sea (SCS) during the winter and summer monsoons. This current is later acknowledged as the South China Sea Shallow Shelf Current (SCSSC). This current is primarily driven by monsoonal winds, and influenced by regional river plumes (Pearl River, Hong River, Mekong River) and the prominent South China Sea Warm Current (SCSWC) and South China Sea Western Boundary Current (SCSWBC). The current exhibits significant seasonal variations in both direction and pattern. During winter, it flows along the northern South China Sea’s (NSCS) shelf and splits into two branches at the east of Hainan Island. One branch enters the Beibu-Tonkin Gulf through the Qiongzhou Strait and forms a major cyclonic circulation within the gulf, while the other branch flows southwestward along the southern coast of Hainan Island. These branches converge around 16°N latitude at the east of the Vietnamese shelf, then flow southward along the Sunda Shelf, where they deflect southwestward in “broadband” forms before curving southeastward along the east coast of Peninsular Malaysia (ECPM) and exiting via the Karimata Strait. In summer, the current exhibits a complex pattern. At the Sunda Shelf, it flows northwestward along the ECPM, then deflects northeastward around 6°N latitude, forming the Sunda Shelf’s anti-cyclonic eddy (SSE) and causing upwelling on the east coast of Peninsular Malaysia (ECPMU). Near the eastern Vietnamese shelf, the current splits around 11-12°N latitude into three distinct currents: the southward-flowing Vietnam Current, the northward-flowing Vietnam Meandering Current (VMC), and the southward-flowing SCSWBC. The VMC flows northward and then deflects northeastward south of Hainan Island, continuing northeastward along the NSCS’s shelf and exiting through the Taiwan Strait.-
Key words:
- shallow shelf current /
- South China Sea /
- Sunda Shelf /
- winter monsoon /
- summer monsoon
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Figure 1. Bathymetry and topography map of the South China Sea (SCS). The red-shaded area inside the red dashed line indicates the domain of the whole SCS domain according to Weng et al. (2016). There are three sub-domains inside the SCS justified in this paper, and named as northern of SCS (NSCS), southern of SCS (SSCS), and Sunda Shelf to ease the reference for readers. The black-dashed arrow is the illustration of the ~
3500 km of the boundary current discussed in this article.Figure 2. Observed transects and stations for boundary currents studies in the SCS. All these transects described the velocity or the volume transport by the previous authors, as tabulated in Table 2. The red-shaded area inside the red dashed line indicates the domain of the whole SCS domain according to (Weng et al., 2016). There are three sub-domains inside the SCS justified in this paper, and named as NSCS, SSCS, and Sunda Shelf to ease the reference for readers. The black-dashed arrow is the illustration of the ~
3500 km of the boundary current discussed in this article.Figure 3. As illustrated in the blue arrow, the schematic diagram for the extension of the South China Sea Shallow Shelf Current (SCSSC) during the winter monsoon. The name for each current as numbered in the figure is tabulated in Table 3.
Table 1. List of hydrographic studies in the SCS that focused on different circulation systems and methods applied. The abbreviation of the current system/ topic names is stated after the table.
Sea domain Author Year Current system/topic Method applied NSCS's shelf Shu et al. (2018) 2018 1CCC Review 2SCSWC 3SCSWBC Ding et al. (2020) 2020 2SCSWC FVCOM Zhang et al. (2018) 2018 2SCSWC FVCOM Ding et al. (2017). 2017 1CCC FVCOM Liao et al. (2018) 2018 2SCSWC ROMS 1CCC Taiwan Strait Hu et al. (2010) 2010 Review Beibu-Tonkin Gulf Gao et al. (2017) 2017 4BTC Review Qiongzhou Strait Chen et al. (2019) 2019 in-situ Vietnam East’s shelf Chen et al. (2012) 2012 5VC FVCOM Vlasova et al. (2020) 2020 cyclonic-anticyclonic eddy Numerical model Sunda Shelf Tangang et al. (2011) 2011 MASNUM + TOPEX Akhir and Chuen (2011) 2011 In-situ Akhir (2012) 2012 6PMC OCCAM Akhir (2014) 2014 Review Mohd Akhir et al. (2014) 2014 MODIS Pa’suya et al. (2014) 2014 TOPEX/POSEIDON Daryabor et al. (2014) 2014 ROMS Daryabor et al. (2015) 2015 ROMS Kok et al. (2015) 2015 HYCOM+ MODIS Akhir et al. (2015) 2015 in-situ + MODIS Daryabor et al. (2016) 2016 SODA + TOPEX Zainol and Akhir (2016a) 2016a in-situ + MODIS Zainol and Akhir (2016b) 2016b MIKE 3D Kok et al. (2017) 2017 in-situ + HYCOM Gulf of Thailand Buranapratheprat (2008) 2008 7GoT circulation review Sojisuporn et al. (2010) satellite Daud et al. (2016) MIKE 3D Buranapratheprat et al. (2016) In-situ SCS Fang et al. (2012) 2012 3SCSWBC review Wang et al. (2013) 2013 3SCSWBC review Shu et al. (2016a) 2016 3SCSWBC in-situ 8VOC Quan et al. (2016) 2016 3SCSWBC REDOS Zhao and Zhu (2016) 2016 3SCSWBC PIES + TOPEX/POSEIDON Lyu et al. (2016) 2016 3SCSWBC in-situ + satelite Zhou et al. (2017) 2017 3SCSWBC In-situ Zhu et al. (2019) 2019 Multi-layer circulation Review Cai and Gan (2020) 2020 Multi-layer circulation Review Tian et al. (2023) 2017 3SCSWBC AVISO + HYCOM Wang et al. (2023) 2023 3SCSWBC AVISO + in-situ Note: 1CCC = China Coastal Current 2SCSWC = South China Sea Warm Current 3SCSWBC = South China Sea Western Boundary Current 4BTC = Beibu - Tonkin Gulf’s current Circulations 5VC = Vietnam Current 6PMC = Peninsular Malaysia Current 7GoT circulation = Gulf of Thailand Circulations 8VOC = Vietnam Offshore Current Table 2. Detail information of the observed stations and transects as illustrated in Figure 2
Transect @ station Literature Data ADCP sampling details Observation period Max velocity Volume transport range summer winter summer winter 1 Li et al. (2018) shipboard ADCP downward facing Winter (1998) 4.3 Sv 2 Li et al. (2018) shipboard ADCP downward facing Winter (1998) 8.1 Sv 3 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −21.1 Sv 4 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −30.3 Sv 5 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −23.7 Sv 6 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −18.7 Sv 7 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −19.9 Sv 8 Li et al. (2018) shipboard ADCP downward facing Winter (1998) −15.5 Sv 9 Shu et al. (2016a) shipboard ADCP downward facing Summer (2010 - 2011) 0.4 m/s Quan et al. (2016) REDOS Summer and winter (1992 - 2011) − 8.3 ± 3.4 Sv OFES − 4.1 ± 2.3 Sv SODA 3.2 ± 2.7 Sv 10 Shu et al. (2016a) shipboard ADCP ● downward facing
● 1 minute data interval
● 16 m data cell size
● 38 KHz frequencySummer 2010, and 2011 0.2 m/s 11 Shu et al. (2016a) moored ADCP ● upward facing
● 450 - 550 m deployed (1 hour data interval)
● 657 m deployed (30 minutes data interval)
● 8 m data cell size
● 75 KHz frequency
● Linear intepolation on data gapsJune 2007 - December 2013 0.4 m/s 0.4 m/s 12 Zhao and Zhu (2016) pressure recording inverted echo sounders (PIES) winter (2015 - 2016) − 5.2 Sv 13 Quan et al. (2016) AVISO Summer and Winter (1992 - 2011) 0.6 ± 6.3 −13.0 ± 3.1 Sv REDOS Summer and Winter (1992 - 2011) −4.6 ± 6.6 Sv −13.6 ± 3.6 Sv Li et al. (2018) shipboard ADCP winter (1998) −27.4 Sv 14 Lyu et al. (2016) moored ADCP ● upward facing
● Deployed at 500 m depth
● 1hour, and 30 minutes data interval
● 8 m data cell size
● A 48-h low-pass filter was applied to remove the high- frequency signal in the ADCP raw dataMay 2004 - September 2005 0.13 m/s 15 Fang et al. (2012) SODA summer (1987 - 2008) 0.5 m/s 16 Akhir (2012) OCCAM August (2003), November (2003) 0.4 m/s 0.6 m/s 17 Zainol and Akhir (2016a) shipboard ADCP ● downward facing
● 1 minute data interval
● 1 m data cell size
● 1 MHz frequencypre-summer, summer (2014) 1 m/s Daryabor et al. (2014) ROMS and SODA Summer (2000 - 2005) 0.8 m/s 18 Akhir (2012) OCCAM August (2003), November (2003) 0.4 m/s 1.2 m/s 19 Daryabor et al. (2016) ROMS and SODA Summer and Winter (2000 - 2006) 3 Sv −6 Sv Table 3. Details on the currents systems as illustrated in Figure 3 and Figure 4
No. Acronym Name of currents 1 CCC China coastal current 2 SCSWC South China Sea Warm Current 3 SCSWBC South China Sea Western Boundary Current 4 QRC* Qiongzhou Strait Residual Current 5 SHC* Southern Hainan Current 6 NVSC* Northern of Vietnam’s east shelf Current 7 SVSC* Southern of Vietnam’s east shelf Current 8 PMC* Peninsular Malaysia Current 9 PRP Pearl River Plume 10 HRP Hong River Plume 11 MRP Mekong River Plume 12 SSCSE* Southern South China Sea Eddy 13 NSCSE* Northern South China Sea Eddy 14 KI Kuroshio Intrusion 15 BTC Beibu-Tonkin’s Gulf Circulation 16 VMC* Vietnam Meandering Current 17 VOC Vietnam Offshore Current 18 SSE* Sunda Shelf anti-cyclonic Eddy * = The ocean currents or circulations which newly acknowledged in this paper Table 4. Volume transport (1 Sv = 1,000,000 m³/s) at four major straits of SCS from previous literatures
Straits Annual
meanSummer Winter Spring Autumn Observational period Reference Approach Taiwan 1.65 Sv 2.1 Sv 1.33 Sv 2.13 Sv 1.04 Sv 1968 - 2008 Yu et al. (2012) Numerical model 0.78 Sv 1.91 Sv −0.31 Sv 1.22 Sv 0.37 Sv 2005 - 2008 Zhang et al. (2014) Numerical model 1.29 Sv ~ 3 Sv ~ 0 Sv 2009 Chen et al. (2016) In-situ observation 1.39 Sv 2010 1.28 Sv 2011 Luzon 5.5 Sv 5 - 14 July 2007 Yang et al. (2010) In-situ observation 4.37 Sv
(at 120 ° E)
−2.68 Sv
(at 120.5 °E)21 June - 5 July 2009 Chen et al. (2011) In-situ observation 4 Sv October 2008 Yuan et al. (2012) In-situ observation −4.54 Sv −2.83 Sv −6.44 Sv −4.4 Sv −4.37 Sv 2014 - 2018 Sun et al. (2023) In-situ observation Karimata −2.75 Sv 2010 Anwar et al. (2017) Numerical model 0.36 Sv −0.66 Sv 2010 - 2014 Anwar et al. (2018) Numerical model −0.74 Sv 0.69 Sv −1.99 Sv 2008 - 2015 Wang et al. (2019) In-situ observation −0.78 ± 0.12 Sv 0.47 ± 0.20 Sv −1.98 ± 0.23 Sv 1993 - 2017 Xu et al. (2021) Regression model −0.96 Sv 2001 - 2015 Kok et al. (2021) Numerical model Mindoro −0.07 Sv 0.87 Sv −1.32 Sv 0.45 Sv −0.24 Sv 2008 Sprintall et al. (2012) In-situ observation -
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