scholarly journals Supplementary material to "Contrasting responses of phytoplankton productivity between coastal and offshore surface waters in the Taiwan Strait and the South China Sea to future CO<sub>2</sub>-induced acidification"

2022 ◽  
Author(s):  
Guang Gao ◽  
Tifeng Wang ◽  
Jiazhen Sun ◽  
Xin Zhao ◽  
Lifang Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Surface Waters ◽  
Taiwan Strait ◽  
The South China Sea ◽  
The South ◽  
Phytoplankton Productivity ◽  
China Sea ◽  
Supplementary Material ◽  
The Taiwan Strait

scholarly journals Contrasting responses of phytoplankton productivity between coastal and offshore surface waters in the Taiwan Strait and the South China Sea to future CO<sub>2</sub>-induced acidification

2022 ◽  
Author(s):  
Guang Gao ◽  
Tifeng Wang ◽  
Jiazhen Sun ◽  
Xin Zhao ◽  
Lifang Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Surface Waters ◽  
Coastal Waters ◽  
The South China Sea ◽  
Surface Seawater ◽  
The South ◽  
China Sea ◽  
The Taiwan Strait ◽  
Induced Changes

Abstract. Future CO2-induced ocean acidification (OA) has been documented to either inhibit or enhance or result in no effect on marine primary productivity (PP). In order to examine effects of OA under multiple drivers, we investigated the influences of OA (a decrease of 0.4 pHtotal units with corresponding CO2 concentrations ranged 22.0–39.7 µM) on PP through deck-incubation experiments at 101 stations in the Taiwan Strait and the South China Sea (SCS), including the coastal zone, the continental shelf and slope, as well as deep-water basin. The daily net primary productivities in surface seawater under incident solar radiation ranged from 17–306 µg C (µg Chl a)−1 d−1, with the responses of PP to OA being region-dependent and the OA-induced changes varying from −88.03 % (inhibition) to 56.87 % (enhancement). The OA-treatment stimulated PP in surface waters of coastal, estuarine and shelf waters, but suppressed it in the South China Sea basin. Such OA-induced changes in PP were significantly related to NOX (the sum of NO3− and NO2−) availability, in situ pH and solar radiation in surface seawater, but negatively related to salinity changes. Our results indicate that phytoplankton cells are more vulnerable to pH drop in oligotrophic waters. Considering high nutrient and low salinity in coastal waters and reduced nutrient availability in pelagic zones with the progressive stratification associated with ocean warming, our results imply that future OA will enhance PP in coastal waters but decrease it in pelagic oligotrophic zones.

scholarly journals Influence of Remote Internal Tides on the Locally Generated Internal Tides upon the Continental Slope in the South China Sea

2021 ◽  
Vol 9 (11) ◽  
pp. 1268
Author(s):  
Zheng Guo ◽  
Anzhou Cao ◽  
Shuya Wang
Keyword(s):  
South China Sea ◽  
Continental Slope ◽  
South China ◽  
Maximum Energy ◽  
The South China Sea ◽  
Internal Tides ◽  
The South ◽  
China Sea ◽  
The Taiwan Strait ◽  
Local Generation

In this paper, the M2 internal tides (ITs) originating from the continental slope in the South China Sea are studied using the CROCO model. The simulation results show that there are two origins of ITs on the continental slope: at 118°–119.5° E along 22° N near the southern entrance of the Taiwan Strait and at 117°–118° E along 20° N near Dongsha Island. The local generation of ITs is greatly influenced by the ITs that radiate from the Luzon Strait (LS). The integrated conversion at the first generation site is increased by 31% to 0.42 GW compared to the case where the LS is excluded from the simulation region. Its maximum energy flux almost doubles to 2.5 kW/m, which is 10% of the westward component. The existence of the other IT beams from Dongsha Island is attributed to the ITs from the LS. The local generation on the continental slope changes when remotely generated ITs alter the amplitudes and phases of the bottom pressure perturbation. These results indicate that the ITs originating from the LS contribute to the spatial variation of ITs in the SCS by modulating the IT generation on the continental slope.

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