Intrusion of the Oyashio water into the eastern mouth of Tsugaru Strait in early summer, 2003

Hydrographic observations based on XBT, XCTD, CTD, and ADCP were performed around the eastern mouth of the Tsugaru Strait in June 2003. This study aims to describe the hydrographic structure of the eastern mouth focusing on the subarctic Oyashio water occupying the northern part, and to discuss the...

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Bibliographic Details
Published in:Continental shelf research 2012-01, Vol.32, p.36-46
Main Authors: Kuroda, Hiroshi, Isoda, Yutaka, Takeoka, Hidetaka, Kuma, Kenshi, Honda, Satoshi, Matsuura, Hiromi, Saitoh, Yukiyo, Takata, Hyoe, Iwade, Shoei, Wagawa, Taku, Kobayashi, Naoto
Format: Article
Language:English
Subjects:
Continental shelves
Diapycnal mixing
Focusing
Inflow
Intrusion
Marine
Modified Oyashio water
Mouth
Near-bottom water
Outflow
Salinity
Straits
Tsugaru strait
Tsugaru Warm Current water
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Summary:Hydrographic observations based on XBT, XCTD, CTD, and ADCP were performed around the eastern mouth of the Tsugaru Strait in June 2003. This study aims to describe the hydrographic structure of the eastern mouth focusing on the subarctic Oyashio water occupying the northern part, and to discuss the intrusion pathway of this water and its modification after the intrusion. Residual and absolute geostrophic velocities show a nearly barotropic inflow (0–25cm/s) and outflow (0–80cm/s) structures in the northern and southern parts of the strait mouth, respectively. In the north, the Oyashio water, classified as the near-bottom and modified Oyashio waters in this study, inflows into the strait. It is inferred that the near-bottom water is changed to the modified Oyashio water after the intrusion by diapycnal mixing and outflow as the modified Oyashio water from underneath of the Tsugaru Warm Current (TWC) water in the deepest part of the strait mouth, together with the TWC water. Horizontal salinity distribution suggests that the near-bottom water is supplied along the isopycnal surface from the subsurface of Hidaka Bay deeper than the strait. ► We examine hydrography around the eastern mouth of Tsugaru Strait in June 2003. ► The subarctic water inflows into the north of the strait from Hidaka Bay. ► The Tsugaru Warm Current (TWC) water outflows from the south of the strait. ► The subarctic water is modified by diapycnal mixing with the TWC water. ► The mixed water is inferred to outflow from the deepest part of the strait.
ISSN:0278-4343
1873-6955
DOI:10.1016/j.csr.2011.10.012