3.2. Propagation of temperature front

The propagation and structure of the thermal front can be determined from the temperature variations along the coast. Fig. 4 shows the time series of the temperature variations at stations EN, HI, KA, and JG. The measurements at station KA were carried out at depths of 10, 20 and 30 m, but the temperature variations were not very different among the three records because the measurements were made in the surface mixed layer. The temperature rise is found in all records, but, as expected, the time of the temperature related to the intrusion is clearly different among the four stations. The maximum temperature and its time were 18.6℃ at 0:00 on the 9th at JG, 18.4℃ at 08:00 on the 9th at KA, 17.9℃ at 14:00 on the 9th at HI, and 17.5℃ at 0:00 on the 10th at EN. The maximum temperature clearly shows a time lag, that is, the thermal-front propagation along the coast. In addition, the maximum values at each station gradually decreased from east to west, and the temperature difference before and after the Kyucho was 2.0℃ at EN, 2.5℃ at HI, 2.5℃ at KA, and 3.5℃ at JG.

Fig. 4. Time series of the temperature at 10m depth at EN, at 3m depth at HI, at 10, 20, and 30m depths at KA, and at 3m depth at JG.

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