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 A 36 kyr geochemical record from the Sea of Japan of organic matter flux variations and changes in intermediate water oxygen concentrations

1999 ◽  
Vol 14 (2) ◽  
pp. 248-259 ◽  
Author(s):  
John Crusius ◽  
Thomas F. Pedersen ◽  
Stephen E. Calvert ◽  
Gregory L. Cowie ◽  
Tadamichi Oba
Keyword(s):  
Organic Matter ◽  
Sea Of Japan ◽  
The Sea Of Japan ◽  
Intermediate Water ◽  
Water Oxygen ◽  
Matter Flux ◽  
Oxygen Concentrations

scholarly journals Late Pliocene–early Pleistocene paleoceanographic evolution of the Sea of Japan

2001 ◽  
Vol 172 (1-2) ◽  
pp. 81-98 ◽  
Author(s):  
Akihisa Kitamura ◽  
Osamu Takano ◽  
Hiroyuki Takata ◽  
Hiroko Omote
Keyword(s):  
Sea Of Japan ◽  
Early Pleistocene ◽  
The Sea Of Japan ◽  
Late Pliocene

scholarly journals Faunistic deep-sea investigations in the Northwest Pacific have increased faunal knowledge at the edge of the changing Arctic Ocean

2018 ◽  
Author(s):  
Angelika Brandt ◽  
Marina Malyutina ◽  
Pedro Martinez
Keyword(s):  
Arctic Ocean ◽  
Deep Sea ◽  
Sea Of Okhotsk ◽  
Marine Ecosystem ◽  
Japan Sea ◽  
The Arctic ◽  
Northwest Pacific ◽  
The Sea Of Japan ◽  
Species Invasions ◽  
Pacific Area

In the past seven years, the biology of the bathyal, abyssal and hadal faunas of meio- macro-, and megabenthos of the northwestern (NW) Pacific have been intensively investigated by Russian and German partners. A total of four joint expeditions with both RV Akademik M.A. Lavrentyev as well as RV Sonne have provided data on the systematic, evolution and biogeography of the deep-sea fauna of the Sea of Japan, Sea of Okhotsk, the Kuril-Kamchatka Trench (KKT) and the NW Pacific open abyssal plain. Goals of these expeditions were to study the biodiversity, biogeography and trophic characteristics of the benthic organisms in different NW Pacific deep-sea environments, to compare more isolated deep-sea basins with more easily accessible ones and to test whether the hadal of the KKT isolates the fauna of the Sea of Okhotsk to the fauna of the open NW Pacific area. An outline of some important results in presented. These data build the basis of the Beneficial ( B iog e ography of the n orthwest Pacific fauna. A benchmark study for e stimations o f alien i nvasions into the Ar c tic Ocean i n times of r a pid c l imate chance) project which aims to deliver a sound biogeographic baseline study of the NW Pacific area. These data will serve as a solid basis and benchmark for predicting potential species invasions supported by the retreat of Arctic Ocean sea ice. Thus our data will be beneficial for the assessment of state and quality of the Arctic marine ecosystem in a changing environment.

Molluscan response to early Pleistocene rapid warming in the Sea of Japan

Geology ◽  
2000 ◽  
Vol 28 (8) ◽  
pp. 723-726
Author(s):  
Akihisa Kitamura ◽  
Hiroko Omote ◽  
Motoyoshi Oda
Keyword(s):  
Sea Of Japan ◽  
Early Pleistocene ◽  
The Sea Of Japan

Distribution of methane content and methane fluxes in the Sea of Japan, Sea of Okhotsk, and near-Kuril Pacific

2016 ◽  
Vol 41 (3) ◽  
pp. 205-212 ◽  
Author(s):  
A. I. Obzhirov ◽  
N. L. Pestrikova ◽  
G. I. Mishukova ◽  
V. F. Mishukov ◽  
A. K. Okulov
Keyword(s):  
Sea Of Japan ◽  
Sea Of Okhotsk ◽  
Japan Sea ◽  
Methane Content ◽  
The Sea Of Japan ◽  
Methane Fluxes

scholarly journals Composite Analysis of Polar Mesocyclones over the Western Part of the Sea of Japan

2018 ◽  
Vol 146 (4) ◽  
pp. 985-1004 ◽  
Author(s):  
Shun-ichi I. Watanabe ◽  
Hiroshi Niino ◽  
Wataru Yanase
Keyword(s):  
Sea Of Japan ◽  
Japan Sea ◽  
The Sea Of Japan ◽  
Convergence Zone ◽  
Composite Analysis ◽  
Cold Air ◽  
Cold Air Outbreak ◽  
Pressure Anomaly ◽  
Upper Level ◽  
Inversion Analysis

Polar mesocyclones occur frequently over the Sea of Japan during winter in association with cold air outbreaks from the Eurasian continent. In this study, the general characteristics of polar mesocyclones over the western part of the Sea of Japan are examined using composite analysis. The synoptic-scale environment associated with these mesocyclones is characterized by a negative sea level pressure anomaly to the east that causes a cold air outbreak at low levels. There is also a geopotential height trough moving eastward at upper levels. In the cold air outbreak, a convergence zone known as the Japan Sea polar airmass convergence zone (JPCZ), collocated with a thermal ridge, develops on the lee side of the mountains at the root of the Korean Peninsula. These polar mesocyclones are generated when the upper-level trough approaches the JPCZ from the west. However, the behavior of the JPCZ and the movement of the polar mesocyclones differ depending on the location of the upper-level trough. A piecewise potential vorticity inversion analysis revealed that the circulation associated with the upper-level trough modifies the low-level winds, which affects the direction of extension of the JPCZ as well as the genesis location and the movement of the polar mesocyclones.

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