scholarly journals Subduction of a low-salinity water mass around the Xisha Islands in the South China Sea

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Zhida Huang ◽  
Wei Zhuang ◽  
Hailong Liu ◽  
Jianyu Hu
Keyword(s):  
South China Sea ◽  
South China ◽  
Water Mass ◽  
The South China Sea ◽  
The South ◽  
Xisha Islands ◽  
China Sea ◽  
Low Salinity ◽  
Low Salinity Water ◽  
Salinity Water

scholarly journals Analysis of Surface Sound Duct in the Northern Shelf of the South China Sea

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Ke Qu ◽  
Shengchun Piao ◽  
Jianbo Zhou ◽  
Fengqin Zhu
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
Near Surface ◽  
Northern Shelf ◽  
China Sea ◽  
Low Salinity ◽  
Low Salinity Water ◽  
Salinity Water

The northern shelf of the South China Sea (NSSCS) is characterized by surface low-salinity water due to discharge from the Pearl River. In such an environment, the surface sound duct (SSD) is the most important duct for near-surface sonar applications. Nevertheless, the mechanism of SSD formation is very complicated and is influenced by salinity, temperature at the air-sea interface, and various additional marine phenomena. In this study, an 8-year conductivity-temperature-depth (CTD) profile of the NSSCS was used to analyze the SSD formation. An advanced diagrammatic method is proposed to provide a quantitative analysis of the contribution of salinity, temperature, and hydrostatic pressure on SSD formation. Large salinity gradient (0.25 psu/m) was shown to play a crucial role in SSD formation when a mixed layer exists. As representative examples, the sea under cold surges, typhoon genesis, and low-salinity lenses were studied. Conversely, the absence of SSDs in low-salinity water was also observed in upwelling regions. This study further showed that highly negative temperature gradients affect SSD formation even in low-salinity water. Furthermore, although the duct depth of a low-salinity SSD is usually less than 10 meters, it still can serve as an effective duct for acoustic propagation.

scholarly journals Recognizing two newHippolytespecies (Decapoda, Caridea, Hippolytidae) from the South China Sea based on integrative taxonomy

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6605 ◽  
Author(s):  
Zhi-Bin Gan ◽  
Xin-Zheng Li
Keyword(s):  
South China Sea ◽  
Phylogenetic Tree ◽  
South China ◽  
Hainan Island ◽  
The South China Sea ◽  
The South ◽  
Xisha Islands ◽  
West Pacific ◽  
China Sea ◽  
The Third

Hippolyteshrimps exhibit abundant biological diversity and display great ecological significance in seaweed bed ecosystems. Dozens ofHippolytespecimens were collected from Hainan Island and the Xisha Islands in the South China Sea. Detailed examination indicates that some of these specimens represent newHippolytespecies. Based on morphological, genetic, and ecological data,Hippolyte chaceisp. nov. andH. nanhaiensissp. nov. are described.H. chaceisp. nov. was collected from theSargassumsp. biotope in Hainan Island and is distinguished from congeners by its unique mandible and the dactylus of the third to fifth pereiopods; this species has a basal position in the Indo-West Pacific species clade in the phylogenetic tree which is reconstructed based on 16S rRNA gene.H. nanhaiensissp. nov. was collected from the biotopes ofGalaxaurasp. orHalimedasp. in the Xisha Islands, and it differs from congeners in a series of characters associated with rostrum, scaphocerite, antennular peduncle, and spines on the dactylus of the third to fifth pereiopods. Additionally, it is sister toH. australiensisin the phylogenetic tree. A key to identifying mature femaleHippolytespecies of the Indo-West Pacific and neighboring seas is provided.

scholarly journals Comparison and validation of global and regional ocean forecasting systems in the South China Sea

2016 ◽  
Author(s):  
Xueming Zhu ◽  
Hui Wang ◽  
Guimei Liu ◽  
Charly Régnier ◽  
Xiaodi Kuang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
In Situ Data ◽  
Operational Forecasting ◽  
Forecasting System ◽  
Salinity Water ◽  
Ocean Forecasting

Abstract. In this paper, the performances of two operational ocean forecasting systems, Mercator Océan (MO) in France and South China Sea Operational Forecasting System (SCSOFS) in China, have been examined. Both systems can provide science-based nowcast/forecast products, such as temperature, salinity, water level and ocean circulations. Based on the observed satellite and in-situ data have been obtained in 2012 in the South China Sea, the comparison and validation of the ocean circulations, the structures of the temperature and salinity, and some mesoscale activities are shown. Comparing with the observation, the ocean circulations and SST of MO show better results than those of SCSOFS. However, the structures of temperature and salinity of SCSOFS are better than those of MO. For the mesoscale activities, SST fronts and SST decreasing during the typhoon Tembin of SCSOFS are better agreement with the previous study or satellite data than those of MO; but both of them show some differences from AVISO data. Finally, according to the results compared in above, some suggestions have been proposed for both systems to improve their performances in the near further.

scholarly journals Impact of Tidal Mixing on Water Mass Transformation and Circulation in the South China Sea

2017 ◽  
Vol 47 (2) ◽  
pp. 419-432 ◽  
Author(s):  
Xiaowei Wang ◽  
Zhiyu Liu ◽  
Shiqiu Peng
Keyword(s):  
South China Sea ◽  
Density Gradient ◽  
South China ◽  
Water Mass ◽  
The South China Sea ◽  
Tidal Mixing ◽  
The South ◽  
China Sea ◽  
Mass Properties ◽  
Water Mass Transformation

AbstractUsing a high-resolution regional ocean model, the impact of tidal mixing on water mass transformation and circulation in the South China Sea (SCS) is investigated through a set of numerical experiments with different configurations of tide-induced diapycnal diffusivity. The results show that including tidal mixing in both the Luzon Strait (LS) and SCS has significant impact on the LS transport and the intermediate–deep layer circulation in the SCS Basin. Analysis of the density field indicates that tidal mixing in both the LS and SCS are essential for sustaining a consistent density gradient and thus a persistent outward-directed baroclinic pressure gradient both between the western Pacific and LS and between the LS and SCS Basin, so as to maintain the strong deep-water transport through the LS. Further analysis of water mass properties suggests that tidal mixing in the deep SCS would strengthen the horizontal density gradient, intensify the basin-scale cyclonic circulation, induce more vigorous overturning, as well as generate the subbasin-scale eddies in the abyssal SCS. The results imply that tidal mixing in both the LS and SCS plays a key dynamic role in controlling water mass properties and deep circulation features in the SCS and thus need to be deliberately parameterized in ocean circulation models for this region.

Temperature, Salinity and Water Mass in the South China Sea

2020 ◽  
pp. 43-75
Author(s):  
Jianyu Hu ◽  
Wei Zhuang ◽  
Jia Zhu ◽  
Zhida Huang ◽  
Shengli Chen ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Water Mass ◽  
The South China Sea ◽  
The South ◽  
China Sea

Coral cover as a proxy of disturbance: A case study of the biodiversity of the hermatypic corals in Yongxing Island, Xisha Islands in the South China Sea

2006 ◽  
Vol 51 (S2) ◽  
pp. 129-135 ◽  
Author(s):  
Hui Huang ◽  
Jiansheng Lian ◽  
Xiaoping Huang ◽  
Liangmin Huang ◽  
Renlin Zou ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Coral Cover ◽  
The South China Sea ◽  
The South ◽  
Xisha Islands ◽  
China Sea ◽  
Hermatypic Corals
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