scholarly journals Chaetognath species-specific responses to climate regime shifts in the Tsushima Warm Current of the Japan Sea

2008 ◽  
Vol 3 (2) ◽  
pp. 86-95 ◽  
Author(s):  
Naoki Nagai ◽  
Kazuaki Tadokoro ◽  
Kazunori Kuroda ◽  
Takashige Sugimoto
Keyword(s):  
Japan Sea ◽  
Regime Shifts ◽  
Tsushima Warm Current ◽  
Climate Regime ◽  
Warm Current ◽  
The Japan Sea ◽  
Species Specific

Millennial-scale fluctuations in water volume transported by the Tsushima Warm Current in the Japan Sea during the Holocene

2019 ◽  
Vol 183 ◽  
pp. 103028
Author(s):  
Keiji Horikawa ◽  
Tomohiro Kodaira ◽  
Ken Ikehara ◽  
Masafumi Murayama ◽  
Jing Zhang
Keyword(s):  
Japan Sea ◽  
Tsushima Warm Current ◽  
Water Volume ◽  
Warm Current ◽  
The Holocene ◽  
The Japan Sea ◽  
Millennial Scale

scholarly journals Behavior of Water Mass Beneath the Tsushima Warm Current in the Japan Sea

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2184
Author(s):  
Xiaorong Fang ◽  
Yutaka Isoda ◽  
Isao Kudo ◽  
Takafumi Aramaki ◽  
Keiri Imai ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Water Mass ◽  
Potential Temperature ◽  
Japan Sea ◽  
Tsushima Warm Current ◽  
Water Masses ◽  
Oxygen Utilization ◽  
Warm Current ◽  
Low Dissolved Oxygen ◽  
The Japan Sea

To better understand the behavior of water mass beneath the Tsushima Warm Current (TWC), we use the vertical cross-sections of potential temperature, salinity and dissolved oxygen in the Japan Sea obtained by the T/V Oshoro Maru of the Hokkaido University during 8–29 June in 2011 to analyze its origins and variations. The results show that the potential temperature and salinity beneath the TWC varies little, but the dissolved oxygen varies largely with the geographical location. There are two deep water masses with different dissolved oxygen content below the TWC. One is on the coastal side with the low dissolved oxygen, and the other is on the offshore side with the high dissolved oxygen. It is inferred that the former one is relatively old water and the latter is the new water. By using the phosphate (PO4) and the apparent oxygen utilization (AOU) relationship, we calculate the PO40 (preformed PO4) as a water mass tracer. These results suggest that the water masses beneath the TWC with high and low dissolved oxygen originate from the same surface water mass in the central Japan Sea.

Surface current structure of the Tsushima Warm Current region in the Japan Sea derived by satellite-tracked surface drifters

2009 ◽  
Vol 65 (6) ◽  
pp. 791-801 ◽  
Author(s):  
Tatsuro Watanabe ◽  
Daisuke Simizu ◽  
Kou Nishiuchi ◽  
Toru Hasegawa ◽  
Osamu Katoh
Keyword(s):  
Surface Current ◽  
Japan Sea ◽  
Tsushima Warm Current ◽  
Warm Current ◽  
Current Structure ◽  
The Japan Sea ◽  
Current Region ◽  
Surface Drifters

Tsushima Warm Current paths in the southwestern part of the Japan Sea

2014 ◽  
Vol 121 ◽  
pp. 83-93 ◽  
Author(s):  
Masashi Ito ◽  
Akihiko Morimoto ◽  
Tatsuro Watanabe ◽  
Osamu Katoh ◽  
Tetsutaro Takikawa
Keyword(s):  
Japan Sea ◽  
Tsushima Warm Current ◽  
Southwestern Part ◽  
Warm Current ◽  
The Japan Sea

Paleoenvironmental and paleoclimatic changes in the Japan Sea since the last glaciation

2020 ◽  
Author(s):  
Xuefa Shi ◽  
Jianjun Zou ◽  
Sergey Gorbarenko
Keyword(s):  
Sea Ice ◽  
Sea Level ◽  
East Asian ◽  
Japan Sea ◽  
Sediment Provenance ◽  
Last Deglaciation ◽  
Central Japan ◽  
Warm Current ◽  
Ice Coverage ◽  
The Japan Sea

<p>The Japan Sea, one of the marginal seas of the North Pacific, communicates with adjacent seas through four shallow straits (<130 m) and the present environment in the Japan Sea is mainly forced by the Tsushima Warm Current (TWC), East Asia Monsoon (EAM) and seasonal sea ice. During the Quaternary, the pronounced effects of glacial eustatic sea level on the hydrography, ocean biogeochemistry and sediment depositions in the Japan Sea over glacial-interglacial cycles. However, the spatial heterogeneity of these forcings exerting on environment of the Japan Sea may results in contrasting response. On the basis of a suite of sediment cores collected during the China-Russia joint expedition in 2010, we investigate the sedimentary processes and paleoenvironment changes in the Japan Sea. We found enhanced extent of seasonal sea-ice coverage in the western Japan Sea, which is synchronous with the intensification of East Asian Winter Monsoon (EAWM) from 15ka to 8ka. During the early last deglaciation (17ka-15ka), perennial sea ice cover at investigated site occurs and thus inhibits the deepwater formation in the Japan Sea. Since 8 ka, increased deep ventilation and dampened sea ice coverage are closely related to enhanced EAWM and invasion of high-salinity TWC into the Japan Sea. In the southern Japan Sea, the sediment provenance is mainly derived from the Yangtze and old yellow rivers, while the terrigenous matter was mainly sourced from the Yangtze River after 7 ka, on the basis of elemental and radiogenic isotopic data (Sr and Nd) of fine-sized (<63 μm) sediments. Abrupt shifts in sediment provenance occurred at ~18 ka and ~7 ka and these time periods are synchronous with changes in surface hydrography and deep ventilation in the Ulleung Basin. In the central Japan Sea, eolian dust sourced from central Asia and Chinese Loess Plateau by westerly was delivered to the central Japan Sea. In addition, deep ventilation in the southern and central Japan Sea evidenced by redox-sensitive elements and ventilation-like radiolarian species suggest intensified ventilation since 8ka and during cold spells of the last deglaciation, which is closely related to the invasion of the Tsushima Warm Current into the Japan Sea. Our data suggest that sea level is a first-order factor in controlling the environment and sediment deposition in the Japan Sea at orbital timescales, while the East Asian Monsoon and Kuroshio Current play a secondary role. Note: This study was supported by the National Natural Science Foundation of China (Grants No. 41420104005, U1606401) and National Program on Global Change and Air-Sea Interaction (GASI-GEOGE-03 &-04).<span> </span></p>

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