Early Pleistocene evolution of the Japan Sea Intermediate Water

2009 ◽  
Vol 24 (8) ◽  
pp. 880-889 ◽  
Author(s):  
Akihisa Kitamura
Keyword(s):  
Japan Sea ◽  
Early Pleistocene ◽  
Intermediate Water ◽  
The Japan Sea

scholarly journals High-salinity intermediate water of the Japan Sea in the eastern Japan Basin

2001 ◽  
Vol 106 (C6) ◽  
pp. 11437-11450 ◽  
Author(s):  
Tatsuro Watanabe ◽  
Mitsuyuki Hirai ◽  
Haruya Yamada
Keyword(s):  
High Salinity ◽  
Japan Sea ◽  
Intermediate Water ◽  
Japan Basin ◽  
The Japan Sea ◽  
Eastern Japan

scholarly journals Formation and Circulation Processes of Intermediate Water in the Japan Sea

1999 ◽  
Vol 29 (8) ◽  
pp. 1701-1722 ◽  
Author(s):  
Yutaka Yoshikawa ◽  
Toshiyuki Awaji ◽  
Kazunori Akitomo
Keyword(s):  
Japan Sea ◽  
Intermediate Water ◽  
The Japan Sea

Pleistocene deep-sea ostracods from the Oki Ridge, Sea of Japan (IODP Site U1426) and condition of the intermediate water

2017 ◽  
Vol 88 (3) ◽  
pp. 430-445 ◽  
Author(s):  
Tatsuhiko Yamaguchi ◽  
Kentaro Kuroki ◽  
Katsura Yamada ◽  
Takuya Itaki ◽  
Kaoru Niino ◽  
...  
Keyword(s):  
Sea Of Japan ◽  
Deep Sea ◽  
Japan Sea ◽  
Winter Monsoon ◽  
Early Pleistocene ◽  
Circulation System ◽  
The Sea Of Japan ◽  
Intermediate Water ◽  
Oxygen Isotope Stage ◽  
Integrated Ocean Drilling Program

AbstractThe Sea of Japan (also termed the East Sea) has a circulation system isolated from the Pacific Ocean and East China Sea. The East Asian winter monsoon drives the circulation system and cools the Tsushima Warm Current (TWC) to form the Japan Sea Intermediate–Proper Water (JSIPW). The intermediate water conveys oxygen to deep-sea floors, which is available for benthic animals. During the Pliocene (3.5–2.8 Ma), Temperate Intermediate Water (TIW) was formed under the weak winter monsoon, and extinct ostracod TIW taxa were found. Little is known about early Pleistocene intermediate water and the extinction mode of benthic ostracods. We studied radiolarians and ostracods from deep-sea sediments between 2.0 and 1.3 Ma (Marine Oxygen Isotope Stage [MIS] 77 to MIS 41) at Integrated Ocean Drilling Program Site U1426, Sea of Japan. The ostracod faunas contained TIW and JSIPW taxa. The radiolarian subtropical-water taxa and the JSIPW ostracods indicate a small influx of the TWC and the JSIPW. The TIW occasionally expanded to the middle bathyal zone. By analogy with the relationship between the modern JSIPW and winter monsoon, weak winter monsoon possibly caused gentle temperature gradients in the water column and the expansion of the TIW. The JSIPW taxa expanded their ranges into the deep sea during interglacial periods.

scholarly journals Taxonomy and palaeobiogeographical significance of four new species of <i>Semicytherura</i> (Ostracoda, Crustacea) from the Early Pleistocene Omma Formation of the Japan Sea coast

2008 ◽  
Vol 27 (2) ◽  
pp. 135-146 ◽  
Author(s):  
Hirokazu Ozawa ◽  
Takahiro Kamiya
Keyword(s):  
New Species ◽  
Benthic Fauna ◽  
Japan Sea ◽  
Early Pleistocene ◽  
Late Cenozoic ◽  
Shallow Sea ◽  
Central Japan ◽  
The Japan Sea ◽  
History Of ◽  
Sea Coast

Abstract. The genus Semicytherura (Ostracoda, Crustacea) is distributed widely in shallow-sea areas of the Northern Hemisphere and occurs commonly in Pliocene and Pleistocene strata along the Japan Sea coasts. Four new species -Semicytherura robustundata sp. nov., Semicytherura subslipperi sp. nov., Semicytherura leptosubundata sp. nov. and Semicytherura tanimurai sp. nov. - are described from the Early Pleistocene Omma Formation, central Japan. These species are palaeobiogeographically significant in the history of species diversity changes in Japan Sea benthic fauna during the Late Cenozoic. The geological and geographical occurrences suggest that these four species originated within the Japan Sea from the Late Pliocene, including one species that diversified by heterochronic evolution, and were endemic to the Japan Sea. They became extinct within this sea during the Early Pleistocene.

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