TY - JOUR
T1 - The behavior and the role of the anti-cyclonic eddy in the Kuroshio large meander development
AU - Sakaida, Futoki
AU - Egusa, Daisuke
AU - Kawamura, Hiroshi
PY - 1998/2
Y1 - 1998/2
N2 - 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 hydrographie 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 the Enshu 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 off Shikoku. This similarity, together with the eddy behavior visible on the satellite SST images, implies that the examined eddy corresponds to the warm water mass off Shikoku. In other words, the warm water mass off Shikoku can be advected near to the Enshu Nada when the Kuroshio large meander occurs.
AB - 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 hydrographie 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 the Enshu 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 off Shikoku. This similarity, together with the eddy behavior visible on the satellite SST images, implies that the examined eddy corresponds to the warm water mass off Shikoku. In other words, the warm water mass off Shikoku can be advected near to the Enshu Nada when the Kuroshio large meander occurs.
KW - Anti-cyclonic eddy
KW - Kuroshio
KW - Large meander development
KW - Satellite SST images
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U2 - 10.1007/BF02744384
DO - 10.1007/BF02744384
M3 - Article
AN - SCOPUS:0031814553
VL - 54
SP - 101
EP - 114
JO - Journal of Oceanography
JF - Journal of Oceanography
SN - 0916-8370
IS - 1
ER -