理想化された数値実験に見られるジェットに沿った渦層厚フラックスと「流軸移動モデル」の関係

概要

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Numerical experiments in an idealized, continuously stratified ocean were carried out to investigate the distribution of the mass/thickness flux by mesoscale eddies along isopycnals. The model domain consisted of a rectangular basin, and a narrow eastward jet was imposed on the western boundary. The flux of the thickness between isopycnals induced by eddies is almost parallel to the jet. The distribution of the eddy-induced thickness flux is qualitatively consistent with an 1.5-layer, fluctuating axis model (FAM) by Masuda (2007), in which the whole flow pattern in the vertical cross section of the jet is assumed to shift with the fluctuating jet axis without changing the shape. The assumption used in the FAM is also validated numerically. In the western part of the model domain, the change of the cross sectional structure of the jet by eddies is mostly consistent with that assumed in the FAM. This feature of eddies indicates that the FAM can correctly predict the qualitative features of the eddy-induced thickness flux in this region. In the eastern part of the model domain, where the eddy motions extend to deeper depths than the jet, errors of the eddy-induced thickness flux estimated by the FAM tend to be large.
Research Institute for Applied Mechanics, Kyushu Universityの論文
2007-09-00