Abstract
Fine structures and their generating processes observed in the seasonal thermocline of the northeast Atlantic during JASIN were analysed. A comparison of the temperature and density fields as well as the stratification parameters showed the dominance of vertical processes, particularly internal wave strain or turbulent mixing. Intrusive and double-diffusive processes were seldom observed. In comparison to numerous intrusions in the main thermocline of the JASIN area, the vertical scales of the fine structure in the seasonal thermocline were smaller. The ratio of the vertical to the horizontal scales was 1:100. To discriminate between reversible and irreversible fine structure, data sets were compared with different theoretical models. The measurements from R.V. Meteor along an oceanic front showed numerous irreversible fine structures, while the observations of R.V. Planet outside the front showed more reversible structures.
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