scholarly journals New Production and F-ratio on the Continental Shelf of the East China Sea: Comparisons Between Nitrate Inputs From the Subsurface Kuroshio Current and the Changjiang River

1999 ◽  
Vol 48 (1) ◽  
pp. 59-75 ◽  
Author(s):  
Y.-L. Lee Chen ◽  
H.-B. Lu ◽  
F.-K. Shiah ◽  
G.C. Gong ◽  
K.-K. Liu ◽  
...  
Keyword(s):  
Continental Shelf ◽  
East China Sea ◽  
Kuroshio Current ◽  
East China ◽  
Changjiang River ◽  
The East China Sea ◽  
New Production ◽  
China Sea ◽  
The Changjiang River

scholarly journals The large variation in organic carbon consumption in spring in the East China Sea

2013 ◽  
Vol 10 (5) ◽  
pp. 2931-2943 ◽  
Author(s):  
C.-C. Chen ◽  
G.-C. Gong ◽  
F.-K. Shiah ◽  
W.-C. Chou ◽  
C.-C. Hung
Keyword(s):  
Low Temperature ◽  
Organic Carbon ◽  
East China Sea ◽  
Phytoplankton Growth ◽  
East China ◽  
Changjiang River ◽  
Carbon Consumption ◽  
The East China Sea ◽  
China Sea ◽  
The Changjiang River

Abstract. A tremendous amount of organic carbon respired by plankton communities has been found in summer in the East China Sea (ECS), and this rate has been significantly correlated with fluvial discharge from the Changjiang River. However, respiration data has rarely been collected in other seasons. To evaluate and reveal the potential controlling mechanism of organic carbon consumption in spring in the ECS, two cruises covering almost the entire ECS shelf were conducted in the spring of 2009 and 2010. These results showed that although the fluvial discharge rates were comparable to the high riverine flow in summer, the plankton community respiration (CR) varied widely between the two springs. In 2009, the level of CR was double that of 2010, with mean (± SD) values of 111.7 (±76.3) and 50.7 (±62.9) mg C m−3 d−1, respectively. The CR was positively correlated with concentrations of particulate organic carbon and/or chlorophyll a (Chl a) in 2009 (all p < 0.01). These results suggest that the high CR rate in 2009 can be attributed to high planktonic biomasses. During this period, phytoplankton growth flourished due to allochthonous nutrients discharged from the Changjiang River. Furthermore, higher phytoplankton growth led to the absorption of an enormous amount of fugacity of CO2 (fCO2) in the surface waters, even with a significant amount of inorganic carbon regenerated via CR. In 2010, even more riverine runoff nutrients were measured in the ECS than in 2009. Surprisingly, the growth of phytoplankton in 2010 was not stimulated by enriched nutrients, and its growth was likely limited by low water temperature and/or low light intensity. Low temperature might also suppress planktonic metabolism, which could explain why the CR was lower in 2010. During this period, lower surface water fCO2 may have been driven mainly by physical process(es). To conclude, these results indicate that high organic carbon consumption (i.e. CR) in the spring of 2009 could be attributed to high planktonic biomasses, and the lower CR rate during the cold spring of 2010 might be likely limited by low temperature in the ECS. This further suggests that the high inter-annual variability of organic carbon consumption needs to be kept in mind when budgeting the annual carbon balance.

Collection of spawning-condition eels of Ariosoma meeki in the Kuroshio Current in the East China Sea

2016 ◽  
Vol 96 (8) ◽  
pp. 1701-1707 ◽  
Author(s):  
Shun Watanabe ◽  
Seishi Hagihara ◽  
Michael J. Miller ◽  
Masamichi Machida ◽  
Kosei Komatsu ◽  
...  
Keyword(s):  
Continental Shelf ◽  
East China Sea ◽  
Seminal Fluid ◽  
Kuroshio Current ◽  
East China ◽  
The East China Sea ◽  
Reproductive Condition ◽  
China Sea ◽  
Gonad Somatic Index ◽  
The Kuroshio

When and where marine eels spawn is poorly known even though species such as those of the family Congridae, Muraenidae and Ophichthidae can be caught in continental shelf habitats. The congrid genus Ariosoma includes small continental shelf eel species whose life histories are not yet known. Mature male and female eels of Ariosoma meeki were observed and captured on 17 August 2009 at the surface at night in the western side of the Kuroshio Current in the East China Sea close to new moon, while they were swimming slowly at the surface and exhibiting apparent reproduction-related behaviour. One male and one sex-unidentified eel (seemingly a male based on body shape) were observed to be chasing one larger female with their heads located near her urogenital pore area. The gonads of the female (540 mm) and the male (410 mm) that were caught by a long-handled dip net were in reproductive condition, because some eggs or seminal fluid were released during handling of the two specimens and high gonad-somatic index (GSI) values of 53 in the female and 20 in the male were recorded. This is one of the few cases in which fully ripe reproductive-condition marine eels have been observed or collected and it provides rare information about the spawning location and timing of this eel species.

Influence of the Changjiang River Flood on Synechococcus Ecology in the Surface Waters of the East China Sea

2013 ◽  
Vol 67 (2) ◽  
pp. 273-285 ◽  
Author(s):  
Chih-Ching Chung ◽  
Chin-Yi Huang ◽  
Gwo-Ching Gong ◽  
Yun-Chi Lin
Keyword(s):  
East China Sea ◽  
Surface Waters ◽  
East China ◽  
Changjiang River ◽  
The East China Sea ◽  
China Sea ◽  
The Changjiang River ◽  
River Flood

scholarly journals The large variation in organic carbon consumption in spring in the East China Sea

2012 ◽  
Vol 9 (11) ◽  
pp. 16533-16564
Author(s):  
C.-C. Chen ◽  
G.-C. Gong ◽  
F.-K. Shiah ◽  
W.-C. Chou ◽  
C.-C. Hung
Keyword(s):  
Organic Carbon ◽  
East China Sea ◽  
Phytoplankton Growth ◽  
East China ◽  
Community Respiration ◽  
Changjiang River ◽  
Carbon Consumption ◽  
The East China Sea ◽  
China Sea ◽  
The Changjiang River

Abstract. A tremendous amount of organic carbon respired by planktonic communities has been found in summer in the East China Sea (ECS), and this rate has been significantly correlated with fluvial discharge from the Changjiang River. However, data related to this issue in other seasons have rarely been collected. To evaluate and reveal the potential controlling mechanism of organic carbon consumption in spring in the ECS, research using stations covering almost the entire ECS shelf was conducted in the spring of 2009 and 2010. During both periods, the fluvial discharges were similar, and these rates were comparable to high riverine flow in summer. Interestingly, planktonic community respiration (CR) varied widely in both springs; in 2009, the level of CR was double that of 2010, with mean (± SD) values of 111.7 (± 76.3) and 50.7 (± 62.9) mg C m−3 d−1, respectively. The CR was positively linearly regressed with concentrations of particulate organic carbon and/or chlorophyll a (Chl a) in 2009 (all p< 0.01). These results suggest that the rate was dependent on planktonic activities, especially that of phytoplankton, in 2009. During this period, phytoplankton growth flourished due to allochthonous nutrients discharged from the Changjiang River. Furthermore, higher phytoplankton growth leaded to the absorption of an enormous amount of fugacity of CO2 (fCO2) in the surface waters, even with a significant amount of inorganic carbon regenerated via CR. In 2010, there were even more riverine runoff nutrients into the ECS than in 2009. Surprisingly, the growth of phytoplankton in 2010 was not stimulated by enriched nutrients, and its growth was likely limited by low water temperature and/or low light intensity. Low temperature might also suppress planktonic metabolism, and this could explain why the CR was lower in 2010. During this period, lower surface water fCO2 might have mainly been driven by physical process(es). To conclude, these results indicate that organic carbon consumption (i.e. CR) in the ECS in spring might be controlled by the magnitude of planktonic activities and physical factor (e.g. temperature), and that the latter is especially important during a cold spring season. This further suggests that the high intraseasonal variability of organic carbon consumption needs to be kept in mind when budgeting the annual carbon balance.

Changes in the Synechococcus Assemblage Composition at the Surface of the East China Sea Due to Flooding of the Changjiang River

2015 ◽  
Vol 70 (3) ◽  
pp. 677-688 ◽  
Author(s):  
Chih-Ching Chung ◽  
Gwo-Ching Gong ◽  
Chin-Yi Huang ◽  
Jer-Young Lin ◽  
Yun-Chi Lin
Keyword(s):  
East China Sea ◽  
East China ◽  
Changjiang River ◽  
The East China Sea ◽  
Assemblage Composition ◽  
China Sea ◽  
The Changjiang River

The impact of the Changjiang River plume extension on the nanoflagellate community in the East China Sea

2010 ◽  
Vol 89 (1) ◽  
pp. 21-30 ◽  
Author(s):  
An-Yi Tsai ◽  
Gwo-Ching Gong ◽  
Robert W. Sanders ◽  
Ciou-Jyu Wang ◽  
Kuo-Ping Chiang
Keyword(s):  
East China Sea ◽  
River Plume ◽  
East China ◽  
Changjiang River ◽  
The East China Sea ◽  
China Sea ◽  
The Changjiang River ◽  
The Impact

Monitoring of the Changjiang River Plume in the East China Sea using a Wave Glider

2018 ◽  
Vol 85 ◽  
pp. 26-30 ◽  
Author(s):  
Taejun Moh ◽  
Jin Hyung Cho ◽  
Seom-Kyu Jung ◽  
Sang-Hyun Kim ◽  
Young Baek Son
Keyword(s):  
East China Sea ◽  
River Plume ◽  
East China ◽  
Changjiang River ◽  
The East China Sea ◽  
China Sea ◽  
The Changjiang River ◽  
Wave Glider
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