Intrusion events of the intermediate Oyashio Water into Sagami Bay, Japan

Tomoharu Senjyu, Noriko Asano, Masaji Matsuyama, Takashi Ishimaru

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Intermediate intrusion of low salinity water (LSW) into Sagami Bay was investigated on the basis of CTD data taken in Sagami Bay and off the Boso Peninsula in 1993-1994. In October 1993, water of low temperature (<7.0°C), low salinity (<34.20 psu) and high dissolved oxygen concentration (>3.5 ml I-1) intruded along the isopycnal surface of σθ = 26.8 at depths of 320-500 m from the Oshima East Channel to the center of the bay. On the other hand, the LSW was absent in Sagami Bay in the period of September-November 1994, though it was always found to the south off the Boso Peninsula. Salinity and dissolved oxygen distributions on relevant isopycnal surfaces and water characteristics of LSW cores revealed that the LSW intruded from the south off the Boso Peninsula to Sagami Bay through the Oshima East Channel. The LSW cores were distributed on the continental slope along 500-1000 m isobaths and its onshore-offshore scales were two to three times the internal deformation radius. Initial phosphate concentrations in the LSW revealed its origin in the northern seas. These facts suggest that the observed LSW is the submerged Oyashio Water and it flows southwestward along the continental slope as a density current in the rotating fluid. The variation of the LSW near the center of Sagami Bay is closely related to the Kuroshio flow path. The duration of LSW in Sagami Bay is 0.5 to 1.5 months.

Original languageEnglish
Pages (from-to)29-44
Number of pages16
JournalJournal of Oceanography
Volume54
Issue number1
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

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intermediate water
continental slope
rotating fluid
water salinity
density current
water
dissolved oxygen
phosphate
salinity

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

Intrusion events of the intermediate Oyashio Water into Sagami Bay, Japan. / Senjyu, Tomoharu; Asano, Noriko; Matsuyama, Masaji; Ishimaru, Takashi.

In: Journal of Oceanography, Vol. 54, No. 1, 01.01.1998, p. 29-44.

Research output: Contribution to journalArticle

Senjyu, Tomoharu ; Asano, Noriko ; Matsuyama, Masaji ; Ishimaru, Takashi. / Intrusion events of the intermediate Oyashio Water into Sagami Bay, Japan. In: Journal of Oceanography. 1998 ; Vol. 54, No. 1. pp. 29-44.
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