scholarly journals Estimated net community production during the summertime at the SEATS time-series study site, northern South China Sea: Implications for nitrogen fixation

2006 ◽  
Vol 33 (22) ◽  
Author(s):  
Wen-Chen Chou ◽  
Yuh-Ling Lee Chen ◽  
David D. Sheu ◽  
Yung-Yen Shih ◽  
Chia-An Han ◽  
...  
Keyword(s):  
Time Series ◽  
Nitrogen Fixation ◽  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
Net Community Production ◽  
Time Series Study ◽  
China Sea ◽  
Series Study ◽  
Community Production

scholarly journals Physical Forcing-Driven Productivity and Sediment Flux to the Deep Basin of Northern South China Sea: A Decadal Time Series Study

2018 ◽  
Vol 10 (4) ◽  
pp. 971 ◽  
Author(s):  
Hon-Kit Lui ◽  
Kuang-Yu Chen ◽  
Chen-Tung Chen ◽  
Bo-Shian Wang ◽  
Hui-Ling Lin ◽  
...  
Keyword(s):  
Time Series ◽  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
Sediment Flux ◽  
Deep Basin ◽  
Time Series Study ◽  
China Sea ◽  
Physical Forcing ◽  
Series Study

scholarly journals High-resolution distributions of O<sub>2</sub>/Ar on the northern slope of the South China Sea and estimates of net community production

2020 ◽  
Author(s):  
Chuan Qin ◽  
Guiling Zhang ◽  
Wenjing Zheng ◽  
Yu Han ◽  
Sumei Liu
Keyword(s):  
High Resolution ◽  
South China Sea ◽  
South China ◽  
Inorganic Nitrogen ◽  
Mixed Layer Depth ◽  
Northern South China Sea ◽  
Net Community Production ◽  
Study Region ◽  
China Sea ◽  
Community Production

Abstract. Net community production (NCP) is a proxy of carbon export from the surface ocean and can be estimated based on O2/Ar. In order to obtain the high-resolution distribution of NCP and improve our understanding of its regulating factors in the slope region of the Northern South China Sea (SCS), we conducted continuous measurements of dissolved O2, Ar, and CO2 by membrane inlet mass spectrometry during cruises in October 2014 and June 2015. An overall autotrophic condition was observed in the study region in both cruises with an average ∆(O2/Ar) of 1.1 % ± 0.9 % in October 2014 and 2.7 % ± 2.8 % in June 2015. NCP was on average 11.5 ± 8.7 mmol C m−2 d−1 in October 2014 and 11.6 ± 12.7 mmol C m−2 d−1 in June 2015. Correlations between dissolved inorganic nitrogen (DIN), ∆(O2/Ar), and NCP were observed in both cruises, indicating that NCP is subject to the nitrogen limitation in the study region. In June 2015, we observed a rapid response of the ecosystem to the episodic nutrient supply induced by eddies. Eddy-entrained shelf water injection, which supplied large amounts of terrigenous nitrogen to the study region, resulted in high productivity along a transect. In addition, upwelling brought large uncertainties to the estimation of NCP at the core region of the cold eddy (cyclone) in June 2015. The correlation between the volumetric NCP (NCPvol) and the mixed layer depth (MLD) indicated that light availability may have also been a factor in influencing NCP in the SCS.

scholarly journals The SouthEast Asian Time-series Study (SEATS) and the biogeochemistry of the South China Sea—An overview

2007 ◽  
Vol 54 (14-15) ◽  
pp. 1434-1447 ◽  
Author(s):  
George T.F. Wong ◽  
Teh-Lung Ku ◽  
Margaret Mulholland ◽  
Chun-Mao Tseng ◽  
Dong-Ping Wang
Keyword(s):  
Time Series ◽  
South China Sea ◽  
South China ◽  
Southeast Asian ◽  
The South China Sea ◽  
The South ◽  
Time Series Study ◽  
China Sea ◽  
Series Study

scholarly journals Seasonal distributions and fluxes of <sup>210</sup>Pb and <sup>210</sup>Po in the northern South China Sea

2014 ◽  
Vol 11 (23) ◽  
pp. 6813-6826 ◽  
Author(s):  
C.-L. Wei ◽  
M.-C. Yi ◽  
S.-Y. Lin ◽  
L.-S. Wen ◽  
W.-H. Lee
Keyword(s):  
Time Series ◽  
South China Sea ◽  
Water Column ◽  
South China ◽  
Time Series Data ◽  
Northern South China Sea ◽  
Sediment Traps ◽  
Series Data ◽  
Secular Equilibrium ◽  
China Sea

Abstract. Vertical distributions of dissolved and particulate 210Pb and 210Po in the water column at the SouthEast Asian Time-series Study (SEATS, 18°00´ N and 116°00´ E) station in the northern South China Sea were determined from four cruises between January 2007 and June 2008. A large deficiency of 210Pb, 379 ± 43 × 103 dpm m−2, from the secular equilibrium was found within the 3500 m water column. On the other hand, a smaller deficiency of 210Po, 100 ± 21 × 103 dpm m−2, relative to 210Pb was found in the water column. Time-series data showed insignificant temporal variability of the 210Pb and 210Po profiles. To balance these deficiencies, the removal fluxes for 210Pb and 210Po via particle settling ranging from 45 to 51 dpm m−2d−1 and from 481 to 567 dpm m−2d−1, respectively, are expected at 3500 m. The 210Pb removal flux is comparable with, whereas the 210Po removal flux is much higher than, the flux directly measured by moored sediment traps. The discrepancy between the modeled 210Po flux and the measured flux suggests that sporadic events that enhance 210Po removal via sinking ballast may occur in the water column at the site.

scholarly journals Nitrate anomaly in the upper nutricline in the northern South China Sea - Evidence for nitrogen fixation

2002 ◽  
Vol 29 (23) ◽  
pp. 12-1-12-4 ◽  
Author(s):  
George T. F. Wong ◽  
Shi-Wei Chung ◽  
Fuh-Kwo Shiah ◽  
Chung-Chi Chen ◽  
Liang-Saw Wen ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
China Sea

Depth distributions of alkalinity, TCO2 and at SEATS time-series site in the northern South China Sea

2007 ◽  
Vol 54 (14-15) ◽  
pp. 1469-1485 ◽  
Author(s):  
W.C. Chou ◽  
D.D. Sheu ◽  
B.S. Lee ◽  
C.M. Tseng ◽  
C.T.A. Chen ◽  
...  
Keyword(s):  
Time Series ◽  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
China Sea ◽  
Depth Distributions

scholarly journals High-resolution distributions of O<sub>2</sub> / Ar on the northern slope of the South China Sea and estimates of net community production

Ocean Science ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 249-264
Author(s):  
Chuan Qin ◽  
Guiling Zhang ◽  
Wenjing Zheng ◽  
Yu Han ◽  
Sumei Liu
Keyword(s):  
High Resolution ◽  
South China Sea ◽  
Mixed Layer ◽  
South China ◽  
Inorganic Nitrogen ◽  
Gross Primary Production ◽  
Net Community Production ◽  
Study Region ◽  
China Sea ◽  
Community Production

Abstract. The dissolved oxygen-to-argon ratio (O2∕Ar) in the oceanic mixed layer has been widely used to estimate net community production (NCP), which is the difference between gross primary production and community respiration; it is a measure of the strength of the biological pump. In order to obtain the high-resolution distribution of NCP and improve our understanding of its regulating factors in the slope region of the northern South China Sea (SCS), we conducted continuous measurements of dissolved O2, Ar, and CO2 with membrane inlet mass spectrometry (MIMS) during two cruises in October 2014 and June 2015. An overall autotrophic condition was observed in the study region in both cruises with an average Δ(O2∕Ar) of 1.1 % ± 0.9 % in October 2014 and 2.7 % ± 2.8 % in June 2015. NCP was on average 11.5 ± 8.7 mmol C m−2 d−1 in October 2014 and 11.6 ± 12.7 mmol C m−2 d−1 in June 2015. Correlations between dissolved inorganic nitrogen (DIN), Δ(O2∕Ar), and NCP were observed in both cruises, indicating that NCP is subject to the nitrogen limitation in the study region. In June 2015, we observed a rapid response of the ecosystem to the episodic nutrient supply induced by eddies. Eddy-entrained shelf water intrusion, which supplied large amounts of terrigenous nitrogen to the study region, promoted NCP in the study region by potentially more than threefold. In addition, upwelling brought large uncertainties to the estimation of NCP in the core region of the cold eddy (cyclone) in June 2015. The deep euphotic depth in the SCS and the absence of correlation between NCP and the average photosynthetically available radiation (PAR) in the mixed layer in the autumn indicate that light availability may not be a significant limitation on NCP in the SCS. This study helps us to understand the carbon cycle in the highly dynamic shelf system.

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