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The behavior and the role of the anti-cyclonic eddy in the Kuroshio large meander development

Authors
  • Sakaida, Futoki1
  • Egusa, Daisuke2
  • Kawamura, Hiroshi3
  • 1 Kobe University of Mercantile Marine, 5-1-1, Fukae Minami machi, Kobe, 658, Japan , Kobe
  • 2 ZUKEN Inc., 2-25-1, Edahigashi, Yokohama, 224, Japan , Yokohama
  • 3 Tohoku University, Aoba, Center for Atmospheric and Oceanic Studies, Faculty of Science, Sendai, 980-77, Japan , Sendai
Type
Published Article
Journal
Journal of Oceanography
Publisher
Springer Netherlands
Publication Date
Jan 01, 1998
Volume
54
Issue
1
Pages
101–114
Identifiers
DOI: 10.1007/BF02744384
Source
Springer Nature
Keywords
License
Yellow

Abstract

The processes underlying the development of the Kuroshio large meanders that occurred in 1986 and 1989 are investigated using a satellite SST data set and hydrographic data. In both processes visible on the satellite SST images, a round-shaped, lower SST region with a diameter of about 200 km is found to the east of the Kuroshio small “trigger” meander (Solomon, 1978) until the region became extinguished near theEnshu Nada. The lower SST region can be interpreted as an anti cyclonic eddy, mainly because of the existence of a warm water mass in the subsurface layer of this region. The warm water mass is characterized by a constant temperature of 18–19°C, the maximum thickness of which is about 400 m. The satellite images show that the eddy is closely related to the Kuroshio path transforming into a shape like the letter “S”. This means that the eddy plays an important role in the development of the Kuroshio large meander since this, too, tends to follow an “S”-shaped path. Added to this, the subsurface layer structure of the eddy is similar to that of the warm water mass offShikoku. This similarity, together with the eddy behavior visible on the satellite SST images, implies that the examined eddy corresponds to the warm water mass offShikoku. In other words, the warm water mass offShikoku can be advected near to theEnshu Nada when the Kuroshio large meander occurs.

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