scholarly journals Benthic fluxes of dissolved organic carbon from gas hydrate sediments in the northern South China Sea

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Chia-Wei Hung ◽  
Kuo-Hao Huang ◽  
Yung-Yen Shih ◽  
Yu-Shih Lin ◽  
Hsin-Hung Chen ◽  
...  
Keyword(s):  
Organic Carbon ◽  
South China Sea ◽  
Dissolved Organic Carbon ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
Benthic Fluxes ◽  
China Sea

scholarly journals Production of Labile Protein-Like Dissolved Organic Carbon Associated With Anaerobic Methane Oxidization in the Haima Cold Seeps, South China Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Tingcang Hu ◽  
Min Luo ◽  
Yunping Xu ◽  
Shanggui Gong ◽  
Duofu Chen
Keyword(s):  
Organic Carbon ◽  
South China Sea ◽  
Dissolved Organic Carbon ◽  
South China ◽  
Northern South China Sea ◽  
Anaerobic Oxidation Of Methane ◽  
Cold Seeps ◽  
Biological Index ◽  
Fluorescence Excitation ◽  
China Sea

Cold seeps where methane-rich fluids escape from the seafloor generally support enormous biomass of chemosynthetic organisms and associated fauna. In addition to transporting a great amount of methane toward the seafloor, cold seeps also contribute to the aged, dissolved organic carbon (DOC) pool in the deep ocean. Here, two sediment cores from the “Haima cold seeps,” northern South China Sea and a nearby reference core were analyzed for pore-water sulfate and DOC concentrations, δ13C of DOC, and optical properties of dissolved organic matter (DOM). High DOC concentrations (0.9–3.7 mM) accompanied by extremely low δ13C values (−43.9 to −76.2‰) suggest the conversion of methane into sedimentary DOC pool in the seep sediments. Parallel factor analysis (PARAFAC) of the fluorescence excitation-emission matrices shows higher fluorescent intensities of labile protein-like components (C2 and C4) and lower fluorescent intensities of refractory humic-like components (C1 and C3) in the seep cores compared to the reference core. The intensity of C2 is positively correlated with DOC concentrations and δ13C-DOC in the seep sediments, suggesting that the labile protein-like DOM was produced by the anaerobic oxidation of methane (AOM). Moreover, low humification index (HIX) and high biological index (BIX) values also indicate intensified production of relatively labile DOM with lower degradation degree in the seep cores compared to the reference core. Hence, we highlight that methane-derived DOC may serve as important carbon and energy sources for heterotrophic microbial communities due to its relatively labile nature.

A complex gas hydrate system imaged jointly using MCS and OBS data from the northern South China Sea

2020 ◽  
Vol 41 (4) ◽  
Author(s):  
Bin Liu ◽  
Xiangchun Wang ◽  
Yunxia Xu ◽  
Pengfei Wen ◽  
Liqing Li ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
China Sea ◽  
Obs Data

Characteristics of phytoplankton communities and their biomass variation in a gas hydrate drilling area in the northern South China Sea

2018 ◽  
Vol 133 ◽  
pp. 606-615 ◽  
Author(s):  
Yu Wang ◽  
Jian-hua Kang ◽  
Qian-yong Liang ◽  
Xue-bao He ◽  
Jian-jun Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
China Sea ◽  
Phytoplankton Communities

N2 fixation impacted by carbon fixation via dissolved organic carbon in the changing Daya Bay, South China Sea

2019 ◽  
Vol 674 ◽  
pp. 592-602 ◽  
Author(s):  
Danyang Li ◽  
Jiaxing Liu ◽  
Run Zhang ◽  
Min Chen ◽  
Weifeng Yang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
South China Sea ◽  
Dissolved Organic Carbon ◽  
South China ◽  
N2 Fixation ◽  
Carbon Fixation ◽  
Daya Bay ◽  
China Sea
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