Seasonal/Spatial Variations of the Near-Inertial Oscillations in the Deep Water of the Japan Sea

2005 ◽  
Vol 61 (4) ◽  
pp. 761-773 ◽  
Author(s):  
Kosuke Mori ◽  
Takeshi Matsuno ◽  
Tomoharu Senjyu
Keyword(s):  
Deep Water ◽  
Japan Sea ◽  
Spatial Variations ◽  
Inertial Oscillations ◽  
The Japan Sea

scholarly journals Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Ocean Science ◽  
2018 ◽  
Vol 14 (3) ◽  
pp. 355-369 ◽  
Author(s):  
Taketoshi Kodama ◽  
Taku Wagawa ◽  
Naoki Iguchi ◽  
Yoshitake Takada ◽  
Takashi Takahashi ◽  
...  
Keyword(s):  
Community Structure ◽  
Zooplankton Community ◽  
Japan Sea ◽  
Spatial Variations ◽  
The West ◽  
Zooplankton Community Structure ◽  
Japanese Coast ◽  
Toyama Bay ◽  
The Japan Sea ◽  
Water Species

Abstract. This study evaluates spatial variations in zooplankton community structure and potential controlling factors along the Japanese coast under the influence of the coastal branch of the Tsushima Warm Current (CBTWC). Variations in the density of morphologically identified zooplankton in the surface layer in May were investigated for a 15-year period. The density of zooplankton (individuals per cubic meter) varied between sampling stations, but there was no consistent west–east trend. Instead, there were different zooplankton community structures in the west and east, with that in Toyama Bay particularly distinct: Corycaeus affinis and Calanus sinicus were dominant in the west and Oithona atlantica was dominant in Toyama Bay. Distance-based redundancy analysis (db-RDA) was used to characterize the variation in zooplankton community structure, and four axes (RD1–4) provided significant explanation. RD2–4 only explained < 4.8 % of variation in the zooplankton community and did not show significant spatial difference; however, RD1, which explained 89.9 % of variation, did vary spatially. Positive and negative species scores on RD1 represent warm- and cold-water species, respectively, and their variation was mainly explained by water column mean temperature, and it is considered to vary spatially with the CBTWC. The CBTWC intrusion to the cold Toyama Bay is weak and occasional due to the submarine canyon structure of the bay. Therefore, the varying bathymetric characteristics along the Japanese coast of the Japan Sea generate the spatial variation in zooplankton community structure, and dominance of warm-water species can be considered an indicator of the CBTWC.

Dynamics of the Japan Sea Deep Water Studied with Chemical and Radiochemical Tracers

1993 ◽  
pp. 105-119 ◽  
Author(s):  
Shizuo Tsunogai ◽  
Yutaka W. Watanabe ◽  
Koh Harada ◽  
Shuichi Watanabe ◽  
Shimei Saito ◽  
...  
Keyword(s):  
Deep Water ◽  
Japan Sea ◽  
The Japan Sea

New insights into the latitudinal ventilation variations in the Japan Sea since the Last Glacial Maximum: A radiolarian assemblage perspective

2020 ◽  
Author(s):  
Zhi Dong ◽  
Xuefa Shi ◽  
Jianjun Zou ◽  
Yanguang Liu ◽  
Ruxi Dou ◽  
...  
Keyword(s):  
Deep Water ◽  
Coastal Upwelling ◽  
Sediment Cores ◽  
Japan Sea ◽  
Volume Transport ◽  
The North ◽  
Radiolarian Assemblage ◽  
Basin Scale ◽  
Japan Sea Proper Water ◽  
The Japan Sea

&lt;p&gt;The formation of intermediate and deep water plays a key role in regulating climate changes at a variety of time scales through the heat redistribution and carbon cycling. The Japan Sea has unique water-mass characteristics in the North Pacific with its own deep-water formation within the Sea itself called Japan Sea Proper Water (JSPW). Latitudinal ventilation changes in the Japan Sea were reconstructed using radiolarian assemblage from three sediment cores, extending from the southwestern, central to northwestern Japan Sea. Here, we present downcore faunal records spanning the last 25&amp;#8239;ka as well as other existing ventilation records in the Japan Sea, and provide reliable evidence to evaluate the potential controlling mechanism that lead to onset and interruption of JSPW ventilation. Taking all together, we argue that radiolarian assemblage records have revealed a distinct basin-scale transition in deep-water conditions from anoxic to oxic during the deglaciation related to changing surface hydrography. However, it should be recognized that there is significant potential for bias in the timing of the ventilation changes among regions. Deep ventilation in the central Japan Sea has been in an interglacial mode during the B&amp;#248;lling/Aller&amp;#248;d presumably related to northward volume transport of the Tsushima Warm Current. Moreover, the decrease of JSPW Assemblage at the B/A in southwestern Japan Sea was attributed to higher export productivity, facilitating suboxic deepwater condition through enhanced consumption of oxygen, which was probably caused by coastal upwelling. In contrast, the weakening ventilation of the northwestern Japan Sea during the B/A and YD periods was probably caused by the blocking effect of the sea ice. Note: This study was supported by the National Natural Science Foundation of China (Grant No. 41420104005, U1606401) and National Program on Global Change and Air-Sea Interaction (GASI-GEOGE-04).&lt;/p&gt;

Iron in the Japan Sea and its implications for the physical processes in deep water

2008 ◽  
Vol 35 (2) ◽  
Author(s):  
Hyoe Takata ◽  
Kenshi Kuma ◽  
Yutaka Isoda ◽  
Shigeyoshi Otosaka ◽  
Tomoharu Senjyu ◽  
...  
Keyword(s):  
Deep Water ◽  
Japan Sea ◽  
Physical Processes ◽  
The Japan Sea

scholarly journals Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

2017 ◽  
Author(s):  
Taketoshi Kodama ◽  
Taku Wagawa ◽  
Naoki Iguchi ◽  
Yoshitake Takada ◽  
Takashi Takahashi ◽  
...  
Keyword(s):  
Community Structure ◽  
Zooplankton Community ◽  
Japan Sea ◽  
Spatial Variations ◽  
Coastal Current ◽  
The West ◽  
Zooplankton Community Structure ◽  
Japanese Coast ◽  
Toyama Bay ◽  
The Japan Sea

Abstract. This study evaluates spatial variations in zooplankton community structure and potential controlling factors along the Japanese coast under the influence of the coastal branch of the Tsushima Warm Current (CBTWC). Variations in the density of morphologically-identified zooplankton in the surface layer in May were investigated for a 15-year period. The density of zooplankton (individuals per cubic meter) varied between sampling stations, but there was no consistent west–east trend. Instead, there were different zooplankton community structures in the west and east, with that in Toyama Bay particularly distinct: Corycaeus affinis and Calanus sinicus were dominant in the west and Oithona atlantica was dominant in Toyama Bay. Distance-based redundancy analysis (db-RDA) was used to characterize the variation in zooplankton community structure, and four axes (RD1–4) provided significant explanation. RD2–4 only explained

CFC Indicating Renewal of the Japan Sea Deep Water in Winter 2000–2001

2003 ◽  
Vol 59 (5) ◽  
pp. 685-693 ◽  
Author(s):  
Shizuo Tsunogai ◽  
Kentaro Kawada ◽  
Shuichi Watanabe ◽  
Takafumi Aramaki
Keyword(s):  
Deep Water ◽  
Japan Sea ◽  
The Japan Sea

Origin of deep water in the Japan Sea over the last 145kyr

2012 ◽  
Vol 339-341 ◽  
pp. 25-38 ◽  
Author(s):  
K. Minoura ◽  
K. Akaki ◽  
N. Nemoto ◽  
S. Tsukawaki ◽  
T. Nakamura
Keyword(s):  
Deep Water ◽  
Japan Sea ◽  
The Japan Sea
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