scholarly journals Rapid scavenging of 234Th and particulate organic matter in the continental shelf water of the Yellow Sea and East China Sea

2021 ◽  
Author(s):  
Jun Hyeong Seo ◽  
Guebuem Kim ◽  
Jeomshik Hwang
Keyword(s):  
Organic Matter ◽  
Continental Shelf ◽  
East China Sea ◽  
Particulate Organic Matter ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
Shelf Water ◽  
China Sea ◽  
Continental Shelf Water

scholarly journals Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics at the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

2013 ◽  
Vol 10 (6) ◽  
pp. 10143-10188 ◽  
Author(s):  
Y. Umezawa ◽  
A. Yamaguchi ◽  
J. Ishizaka ◽  
T. Hasegawa ◽  
C. Yoshimizu ◽  
...  
Keyword(s):  
Surface Water ◽  
East China Sea ◽  
Yellow Sea ◽  
Cold Water ◽  
The Yellow Sea ◽  
Subsurface Water ◽  
East China ◽  
Nursery Ground ◽  
Shelf Water ◽  
China Sea

Abstract. The northern East China Sea (ECS) serves as a spawning and nursery ground for many species of fish and squid. To clarify the basis of the food web in the northern ECS, we examined the nitrate (NO3) dynamics along four latitudinal transects based on stable nitrogen and oxygen isotopes of NO3 (δ15NNO3 and δ18ONO3) and temperature-salinity dynamics in both winter (February 2009) and summer (July 2009 and July 2011). The δ15NNO3 and δ18ONO3, which were distinctly different among the potential NO3 sources, were useful for clarifying NO3 sources and its actual usage by phytoplankton. In winter, Kuroshio Subsurface Water (KSSW) and the Yellow Sea Mixed Water (YSMW) predominantly contributed to NO3 distributed in the shelf water. In the surface water of the Okinawa Trough, NO3 from the KSSW, along with a temperature increase caused by an intrusion of Kuroshio Surface Water (KSW), seemed to stimulate phytoplankton growth. In summer, Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and KSSW affected the distribution and abundance of NO3 in the northern ECS, depending on precipitation in the Changjiang drainage basin and the development of the YSCWM in the shelf bottom water. Isotopic fractionation during NO3 uptake by phytoplankton seemed to drastically change δ15NNO3 and δ18ONO3, which may indirectly indicate the amount of primary production. And δ15NNO3-ln([NO3]) dynamics and relatively lighter δ15NNO3 suggested that atmospheric nitrogen and nitrification may have contributed to NO3 dynamics, too, in surface and subsurface layers, respectively, during summer, suggesting a tightly coupled nitrogen cycle in the shelf water of the northern ECS.

scholarly journals Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

2014 ◽  
Vol 11 (4) ◽  
pp. 1297-1317 ◽  
Author(s):  
Y. Umezawa ◽  
A. Yamaguchi ◽  
J. Ishizaka ◽  
T. Hasegawa ◽  
C. Yoshimizu ◽  
...  
Keyword(s):  
Surface Water ◽  
East China Sea ◽  
Yellow Sea ◽  
Cold Water ◽  
The Yellow Sea ◽  
Subsurface Water ◽  
East China ◽  
Nursery Ground ◽  
Shelf Water ◽  
China Sea

Abstract. The northern East China Sea (ECS) serves as a spawning and nursery ground for many species of fish and squid. To clarify the basis of the food web in the northern ECS, we examined the nitrate (NO3) dynamics along four latitudinal transects based on stable nitrogen and oxygen isotopes of NO3 (δ15NNO3 and δ18ONO3) and temperature–salinity dynamics in both winter (February 2009) and summer (July 2009 and July 2011). The δ15NNO3 and δ18ONO3, which were distinctly different among the potential NO3 sources, were useful for clarifying NO3 sources and its actual usage by phytoplankton. In winter, Kuroshio Subsurface Water (KSSW) and the Yellow Sea Mixed Water (YSMW) predominantly contributed to NO3 distributed in the shelf water. In the surface water of the Okinawa Trough, NO3 from the KSSW, along with a temperature increase caused by an intrusion of Kuroshio Surface Water (KSW), seemed to stimulate phytoplankton growth. In summer, Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and KSSW affected the distribution and abundance of NO3 in the northern ECS, depending on precipitation in the Changjiang drainage basin and the development of the YSCWM in the shelf bottom water. Although isotopic fractionation during NO3 uptake by phytoplankton seemed to drastically increase δ15NNO3 and δ18ONO3 in summer, relatively light nitrate with δ15NNO3 lower than expected from this fractionation effect might be explained by contribution of atmospheric nitrogen and/or nitrification to NO3 dynamics in the surface and subsurface layers. If the latter were a dominant process, this would imply a tightly coupled nitrogen cycle in the shelf water of the northern ECS.

Morphology of seven Collichthys lucidus populations near the coast of the Yellow Sea and East China Sea

2018 ◽  
Vol 25 (3) ◽  
pp. 576 ◽  
Author(s):  
Shuzhang LIANG ◽  
Wei SONG ◽  
Ming ZHAO ◽  
Wei CHEN ◽  
Yu LI ◽  
...  
Keyword(s):  
East China Sea ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
China Sea ◽  
Collichthys Lucidus

Distribution and influencing factors of dissolved manganese in the Yellow Sea and the East China Sea

2021 ◽  
pp. 104002
Author(s):  
Yuan Zhang ◽  
Lei Li ◽  
Jingling Ren ◽  
Huijun He ◽  
Ruifeng Zhang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
East China Sea ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea
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