Relative contributions of local wind and topography to the coastal upwelling intensity in the northern South China Sea

2014 ◽  
Vol 119 (4) ◽  
pp. 2550-2567 ◽  
Author(s):  
Dongxiao Wang ◽  
Yeqiang Shu ◽  
Huijie Xue ◽  
Jianyu Hu ◽  
Ju Chen ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Coastal Upwelling ◽  
Northern South China Sea ◽  
Local Wind ◽  
China Sea ◽  
Upwelling Intensity

Inversion of bio-optical properties in the coastal upwelling waters of the northern South China Sea

2014 ◽  
Vol 85 ◽  
pp. 73-84 ◽  
Author(s):  
Junfang Lin ◽  
Wenxi Cao ◽  
Guifen Wang ◽  
Wen Zhou ◽  
Zhaohua Sun ◽  
...  
Keyword(s):  
Optical Properties ◽  
South China Sea ◽  
South China ◽  
Coastal Upwelling ◽  
Northern South China Sea ◽  
China Sea

Effects of coastal upwelling on picophytoplankton distribution off the coast of Zhanjiang in South China Sea

2014 ◽  
Vol 43 (3) ◽  
Author(s):  
Mei-Lin Wu ◽  
You-Shao Wang ◽  
Dong-Xiao Wang ◽  
Jun-De Dong
Keyword(s):  
South China Sea ◽  
South China ◽  
Coastal Upwelling ◽  
Northern South China Sea ◽  
Euphotic Zone ◽  
Horizontal Gradient ◽  
Vertical Temperature ◽  
The West ◽  
Factors Affecting ◽  
China Sea

AbstractCoastal upwelling occurred along the west coast of Guangdong in the northern South China Sea during the summer of 2006. The effects of upwelling on the vertical and horizontal distributions of Prochlorococcus and Synechococcus were investigated. A distinct vertical temperature difference between the surface water and water at a depth of 30 m was observed in the coastal upwelling region. There was a clear spatial variability of temperature, and an increasingly obvious horizontal gradient was created from the coast to offshore waters. Picophytoplankton communities observed from the coast to offshore waters were significantly different. In the coastal upwelling waters, the picophytoplankton community was dominated by Synechococcus within the euphotic zone. Prochlorococcus dominated the picophytoplankton community in the euphotic zone in the non-upwelling region. This difference in the picophytoplankton community structure was due to different hydrodynamics. The results of canonical correspondence analysis demonstrate that temperature, salinity, and phosphate concentration may be important factors affecting the distribution of Prochlorococcus and Synechococcus.

scholarly journals Coupling of surface <i>p</i>CO<sub>2</sub> and dissolved oxygen in the northern South China Sea: impacts of contrasting coastal processes

2009 ◽  
Vol 6 (3) ◽  
pp. 6249-6269 ◽  
Author(s):  
W. Zhai ◽  
M. Dai ◽  
W. Cai
Keyword(s):  
South China Sea ◽  
Dissolved Oxygen ◽  
South China ◽  
Coastal Upwelling ◽  
Northern South China Sea ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Deep Basin ◽  
Co2 Partial Pressure ◽  
China Sea

Abstract. We examined the relationship between CO2 partial pressure (pCO2) and dissolved oxygen (DO) based on a cruise conducted in July 2004 to the northern South China Sea, spanning from estuarine plume, coastal upwelling and deep basin areas. Distinct relationships between pCO2 and DO saturation were identified in different regimes. In coastal upwelling areas and the Pearl River estuary, biological drawdown of pCO2 and production of O2 were simultaneously observed. The two properties were coupled with each other primarily via photosynthesis and respiration. The stoichiometric relationship of the two properties however, was quite different in these two environments due to different values of the Revelle factor. In the offshore areas, apart from the estuary and upwelling, the dynamics of pCO2 and DO were mainly influenced by air-sea exchange during water mixing. Given the fact that air-sea re-equilibration of O2 is much faster than that of CO2, the observed pCO2-DO relationship deviated from that of the theoretical prediction based on the Redfield relationship in the offshore areas.

scholarly journals Phytoplankton response to a plume front in the northern South China Sea

2018 ◽  
Vol 15 (8) ◽  
pp. 2551-2563 ◽  
Author(s):  
Qian P. Li ◽  
Weiwen Zhou ◽  
Yinchao Chen ◽  
Zhengchao Wu
Keyword(s):  
South China Sea ◽  
South China ◽  
Bottom Water ◽  
Coastal Upwelling ◽  
Frontal Zone ◽  
Northern South China Sea ◽  
River Estuary ◽  
Frontal System ◽  
China Sea ◽  
Plume Water

Abstract. Due to a strong river discharge during April–June 2016, a persistent salinity front, with freshwater flushing seaward on the surface but seawater moving landward at the bottom, was formed in the coastal waters west of the Pearl River estuary (PRE) over the northern South China Sea (NSCS) shelf. Hydrographic measurements revealed that the salinity front was influenced by both the river plume and coastal upwelling. On shipboard nutrient-enrichment experiments with size-fractionation chlorophyll a measurements were taken on both sides of the front as well as in the frontal zone to diagnose the spatial variations of phytoplankton physiology across the frontal system. We also assessed the size-fractionated responses of phytoplankton to the treatment of plume water at the frontal zone and the sea side of the front. The biological impact of vertical mixing or upwelling was further examined by the response of surface phytoplankton to the addition of local bottom water. Our results suggested that there was a large variation in phytoplankton physiology on the sea side of the front, driven by dynamic nutrient fluxes, although P limitation was prevailing on the shore side of the front and at the frontal zone. The spreading of plume water at the frontal zone would directly improve the growth of microphytoplankton, while nano- and picophytoplankton growths could have become saturated at high percentages of plume water. Also, the mixing of bottom water would stimulate the growth of surface phytoplankton on both sides of the front by altering the surface N∕P ratio to make it closer to the Redfield stoichiometry. In summary, phytoplankton growth and physiology could be profoundly influenced by the physical dynamics in the frontal system during the spring–summer of 2016.

scholarly journals Using TPI to Map Spatial and Temporal Variations of Significant Coastal Upwelling in the Northern South China Sea

2021 ◽  
Vol 13 (6) ◽  
pp. 1065 ◽  
Author(s):  
Weian Shi ◽  
Zhi Huang ◽  
Jianyu Hu
Keyword(s):  
South China Sea ◽  
South China ◽  
Coastal Upwelling ◽  
Northern South China Sea ◽  
River Estuary ◽  
Temporal Variations ◽  
Mapping Method ◽  
Chl A ◽  
China Sea ◽  
Influence Area

Based on Himawari-8 Sea Surface Temperature (SST) data and the semi-automatic Topographic Position Index (TPI)-based mapping method, this study maps the significant coastal upwelling in the northern South China Sea (NSCS). The results show that the Minnan coastal upwelling mainly occurs within 100 km off the south coast of Fujian; the Yuedong coastal upwelling appears to the east of Pearl River Estuary, limited to the area shallower than 40 m; and the Qiongdong coastal upwelling occurs most frequently in the area shallower than 75 m off the east coast of Hainan Island. Based on the results, this paper quantitatively describes the temporal and spatial variations of upwelling duration, influence area, upwelling SST anomaly, and chlorophyll-a (Chl-a) increase. Different coastal upwelling regions in the NSCS are significantly different in characteristics. The Qiongdong coastal upwelling has the longest duration and occurs most frequently, the Yuedong coastal upwelling has the largest influence area and Chl-a increase, and the Minnan coastal upwelling is quite strong in the NSCS.

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