scholarly journals Fortnightly variation of the Tsushima Warm Current on the continental shelf in the southwestern Japan Sea

2021 ◽  
Author(s):  
Tetsutaro Takikawa ◽  
Akihiko Morimoto ◽  
Moeto Kyushima ◽  
Kaoru Ichikawa ◽  
Kei Yufu
Keyword(s):  
Continental Shelf ◽  
Japan Sea ◽  
Tsushima Warm Current ◽  
Warm Current

scholarly journals Transition of the Tsushima Warm Current Path Observed over Toyama Trough, Japan

2017 ◽  
Vol 47 (11) ◽  
pp. 2721-2739 ◽  
Author(s):  
Yosuke Igeta ◽  
Alexander Yankovsky ◽  
Ken-ichi Fukudome ◽  
Satoshi Ikeda ◽  
Noriyuki Okei ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Japan Sea ◽  
Volume Transport ◽  
Tsushima Warm Current ◽  
Northern Coast ◽  
Warm Current ◽  
Positive Vorticity ◽  
Current Path ◽  
Japanese Coast ◽  
Adcp Observations

AbstractMooring, CTD, and ADCP observations were made in 2012 in and around the Toyama Trough (TT) cutting across a continental shelf along the Japanese coast of the Japan Sea between Noto Peninsula (NP) and Sado Island (SI) to investigate spatiotemporal characteristics of path transition of the coastal branch of the Tsushima Warm Current (CBTWC). Around SI, downstream of the TT boundary, a wavelike alongshore current perturbation, accompanied by sea level rise, was observed. This perturbation occurred after the seasonal amplification of the CBTWC around the NP on the upstream boundary of the TT. This process was delineated by the results of numerical experiments performed with a two-layer model using idealized topography. The model showed that a current path of the CBTWC shifted from alongshore mode to offshore mode bridged over the TT in association with the lee eddy development behind the NP toward the SI over the TT. This lee eddy is generated by positive vorticity induced over topographic discontinuity between the continental shelf off the northern coast of the NP and deeper region of the TT. The model indicated the period of eddy formation is 60–90 days if the volume transport is 1 Sv (1 Sv ≡ 106 m3 s−1), whereas the observations showed the formation period was only 47 days at 1.2 Sv of volume transport. To explain this discrepancy, temporal variation of the CBTWC, vortex supply from preexisting eddies, or eddies caused by the scattering of coastal-trapped waves were suggested as new processes that accelerate the growth rate of the lee eddy.

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

Structure of the Tsushima warm current in the northeastern Japan Sea

2006 ◽  
Vol 62 (4) ◽  
pp. 527-538 ◽  
Author(s):  
Tatsuro Watanabe ◽  
Osamu Katoh ◽  
Haruya Yamada
Keyword(s):  
Japan Sea ◽  
Tsushima Warm Current ◽  
Warm Current ◽  
Northeastern Japan

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
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