scholarly journals Methane Source and Turnover in the Shallow Sediments to the West of Haima Cold Seeps on the Northwestern Slope of the South China Sea

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Junxi Feng ◽  
Shengxiong Yang ◽  
Hongbin Wang ◽  
Jinqiang Liang ◽  
Yunxin Fang ◽  
...  
Keyword(s):  
Steady State ◽  
South China Sea ◽  
South China ◽  
Methane Flux ◽  
The South China Sea ◽  
Cold Seeps ◽  
The South ◽  
The West ◽  
China Sea ◽  
Methane Fluxes

The Haima cold seeps are active cold seep areas that were recently discovered on the northwestern slope of the South China Sea (SCS). Three piston cores (CL30, CL44, and CL47) were collected within an area characterized by bottom simulating reflectors to the west of Haima cold seeps. Porewater profiles of the three cores exhibit typical kink-type feature, which is attributed to elevated methane flux (CL30) and bubble irrigation (CL44 and CL47). By simulating the porewater profiles of SO42-, CH4, PO43-, Ca2+, Mg2+, and dissolved inorganic carbon (DIC) in CL44 and CL47 using a steady-state reaction-transport model, we estimated that the dissolved SO42- was predominantly consumed by anaerobic oxidation of methane (AOM) at rates of 74.3 mmol m−2 yr−1 in CL44 and 85.0 mmol m−2 yr−1 in CL47. The relatively high AOM rates were sustained by free gas dissolution rather than local methanogenesis. Based on the diffusive Ba2+ fluxes and the excess barium contents in the sediments slightly above the current SMTZ, we estimated that methane fluxes at core CL44 and CL47 have persisted for ca. 3 kyr and 0.8-1.6 kyr, respectively. The non-steady-state modeling for CL30 predicted that a recent increase in upward dissolved methane flux was initiated ca. 85 yr ago. However, the required time for the formation of the barium front above the SMTZ at this core is much longer (ca. 2.2-4.2 kyr), which suggests that the depth of SMTZ possibly has fluctuated due to episodic changes in methane flux. Furthermore, using the model-derived fractions of different DIC sources and the δ13CDIC mass balance calculation, we estimated that the δ13C values of the external methane in cores CL30, CL44, and CL47 are -74.1‰, -75.4‰, and -66.7‰, respectively, indicating the microbial origin of methane. Our results suggest that methane seepage in the broader area surrounding the Haima cold seeps probably has persisted at least hundreds to thousands of years with changing methane fluxes.

About the methane flux into the atmosphere in the South-China sea

2019 ◽  
Vol 486 (1) ◽  
pp. 103-107
Author(s):  
R. B. Shakirov ◽  
A. V. Yatsuk ◽  
G. I. Mishukova ◽  
A. I. Obzhirov ◽  
I. G. Yugai ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Methane Flux ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Methane Fluxes ◽  
International Indian Ocean Expedition ◽  
Academy Of Sciences ◽  
Hydrocarbon Deposits

The new results of gasgeochemical studies in the integrated expedition of the Russian Academy of Sciences on R/V “Akademik Boris Petrov” (Cruise 42) along the regional profile (3180 km) in the South China Sea (Bien Dong) from January 10-16, 2017 are presented. The expedition conducted in the frame of the Second International Indian Ocean Expedition (IIOE-2). For the first time, five zones of increased methane fluxes were detected. Zones with maximum values of methane fluxes correlate well with the location of hydrocarbon deposits and tectonic faults.

6. Ecosystems of cold seeps in the South China Sea

2017 ◽  
Author(s):  
Mingyang Niu ◽  
Qianyong Liang ◽  
Dong Feng ◽  
Fengping Wang
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Cold Seeps ◽  
The South ◽  
China Sea

West Sea Special Zone between South Korea and North Korea

2015 ◽  
Vol 3 (1) ◽  
pp. 20-37
Author(s):  
Seokwoo Lee ◽  
Leonardo Bernard
Keyword(s):  
South China Sea ◽  
South China ◽  
Economic Benefits ◽  
The South China Sea ◽  
The South ◽  
The West ◽  
China Sea ◽  
Maritime Boundary ◽  
Maritime Disputes ◽  
Special Zone

States currently involved in maritime disputes in the South China Sea can learn from the experience of the Koreas in creating a framework for the “Special Peace and Cooperation Zone in the West Sea.” Like the nll, the maritime boundary issues in the South China Sea are unlikely to be resolved in the near future by direct negotiations. Formal adjudication, while a possibility, is probably unlikely. Clearly, war will benefit no one. Thus, the most viable alternative may be to pursue joint economic projects, similar to the West Sea Special Zone that will grant each party economic benefits while building confidence and reducing tension in the region.

scholarly journals KONDISI OSEANOGRAFI DI SELAT MATAK KABUPATEN KEPULAUAN ANAMBAS MELALUI MODEL HIDRODINAMIKA

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Agung Riyadi ◽  
Nusa Idaman Said ◽  
Matih Santos
Keyword(s):  
South China Sea ◽  
Flow Velocity ◽  
South China ◽  
High Tide ◽  
Maximum Flow ◽  
Flow Patterns ◽  
The South China Sea ◽  
The South ◽  
The West ◽  
China Sea

This paper describes some of the general condition of the oceanographic parameters in the Strait Matak, Anambas Archipelago. The data flow is obtained by direct measurement by using a current meter types RCM-7. Simulation models using Mike 21. Mike flow pattern is divided into two seasons, namely west season (January) and the east season (August) and flow patterns ahead of the tide when the season is generally moving west to wards the south, it demonstrates the role of strong tidal influence the movement of waterin the study area. Flow velocity in the strait just before the tide on the west season reaches 1m/s.  Flow patterns at high tide on the west season looks still moving toward sthe south. The maximum flow velocity in the strait when the tide reaches 0.32 m/s, while the average speed in the area of the model is 0.12 m/s. Low tide towards the current pattern is still moving towards the south, it reinforces the notion that in addition to tidal windsare also very significant role in moving the flow, in this case that the current is moving toward the south. Flow velocity just before low tide reaches 0.85 m/s. Flow patterns at low tide shows the differences in the three previous conditions, the current in the strait to move out to the north toward the South China Sea. In condition slow tide, the tida lmore dominantly than the wind, this proved to even though the wind toward the south, the currents inthestraitis moving toward snorth along the tidal flow leading to the South China Sea. Flow velocity is quite varied location of modeling; flow velocity at low tide reaches 0.5m/s, with the average 0.15 m/s. Keywords: current and direction, wind, tide, model.

The Boat People of Vietnam. Rescue on the South China Sea

1990 ◽  
Vol 76 (1) ◽  
pp. 49-51
Author(s):  
T. J. Hayes ◽  
D. Thomas ◽  
E. P. Dewar
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Economic Conditions ◽  
The South ◽  
The West ◽  
China Sea ◽  
Boat People ◽  
Political Refugees ◽  
Large Numbers

AbstractPoor economic conditions in Vietnam have encouraged large numbers of people seeking a better life in the West to join the flow of political refugees leaving the country as “boat people”. We report the events surrounding one such group of people who were rescued from the South China Sea by the Outback 88 Task Group.

Different roles of Ekman pumping in the west and east segments of the South China Sea Warm Current

2011 ◽  
Vol 30 (3) ◽  
pp. 1-13 ◽  
Author(s):  
Qiang Wang ◽  
Yinxia Wang ◽  
Hong Bo ◽  
Weidong Zhou ◽  
Dongxiao Wang
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Ekman Pumping ◽  
The South ◽  
The West ◽  
Warm Current ◽  
China Sea

Recent brachiopods from the South China Sea, NW Pacific

Zootaxa ◽  
2017 ◽  
Vol 4306 (2) ◽  
pp. 287 ◽  
Author(s):  
MARIA ALEKSANDRA BITNER ◽  
MARCO ROMANIN
Keyword(s):  
South China Sea ◽  
Northern Hemisphere ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
The West ◽  
West Pacific ◽  
China Sea ◽  
Recent Brachiopods ◽  
First Time

Three articulated brachiopod species have been recognized in material collected during the 2014 French-Taiwanese cruise DongSha to the South China Sea, NW Pacific: Terebratulina japonica (Sowerby, 1846), Macandrevia sp. and Nipponithyris afra Cooper, 1973. Nipponithyris afra is noted for the first time from the Northern Hemisphere and the genus Macandrevia is reported for the first time from the West Pacific. All species are reported for the first time from the South China Sea, extending their biogeographical range. 

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