Journal of Oceanography

, Volume 73, Issue 1, pp 39–54 | Cite as

Numerical simulation of Pacific water intrusions into Otsuchi Bay, northeast of Japan, with a nested-grid OGCM

  • Takashi T. Sakamoto
  • L. Shogo Urakawa
  • Hiroyasu Hasumi
  • Miho Ishizu
  • Sachihiko Itoh
  • Teruhisa Komatsu
  • Kiyoshi Tanaka
Special Section: Original Article Oceanographic observations after the 2011 earthquake off the Pacific coast of Tohoku

Abstract

A numerical simulation of Otsuchi Bay located on the northeast coast of the Honshu, the largest island of Japan, is conducted, using an ocean general circulation model (OGCM) with a nested-grid system in order to illustrate seasonal variability of the circulation in the bay. Through a year, an anticlockwise circulation is dominant in the bay, as observational studies have implied, although it is modified in the bay-mouth-half of the bay in winter. In addition, there is an intense outflow at the surface layer during spring to autumn, influenced by river water discharge. Intrusion of the Pacific water into the bay is influened by mean circulations, but it is also influenced by baroclinic tides from spring to autumn. Pacific water intrusions affected by baroclinic tides may have an impact on the environment in Otsuchi Bay.

Keywords

Baroclinic tide Sanriku coast High-resolution numerical model River discharge Climatological circulation 

Supplementary material

10872_2015_344_MOESM1_ESM.pdf (6.1 mb)
Supplementary material 1 (PDF 6198 kb)

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Copyright information

© The Oceanographic Society of Japan and Springer Japan 2016

Authors and Affiliations

  • Takashi T. Sakamoto
    • 1
  • L. Shogo Urakawa
    • 2
  • Hiroyasu Hasumi
    • 1
  • Miho Ishizu
    • 1
  • Sachihiko Itoh
    • 1
  • Teruhisa Komatsu
    • 1
  • Kiyoshi Tanaka
    • 1
  1. 1.Atmosphere and Ocean Research Institute (AORI)The University of TokyoKashiwaJapan
  2. 2.Meteorological Research InstituteJapan Meteorological AgencyTsukubaJapan

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