. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Observations of Laminae in Thermocline 117 -1 r 0 1 1 1~ 1 1 1 1— HRS. 1S. 16-17. II. 1969 10°30'N, 43'20W ATEX 69 Figure 5 Depth variation of the 25°-, 20°- and 15°-isotherms for a period of 15 hours on February 16-17, 1969 at 10°30' N and 43°20' W the 15 hour period. Their spacing represents the mean temperature gradient. As seen from the top curve, the surface mixed layer penetrated below 60 meters after 5 hours and remained for the rest of this
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Observations of Laminae in Thermocline 117 -1 r 0 1 1 1~ 1 1 1 1— HRS. 1S. 16-17. II. 1969 10°30'N, 43'20W ATEX 69 Figure 5 Depth variation of the 25°-, 20°- and 15°-isotherms for a period of 15 hours on February 16-17, 1969 at 10°30' N and 43°20' W the 15 hour period. Their spacing represents the mean temperature gradient. As seen from the top curve, the surface mixed layer penetrated below 60 meters after 5 hours and remained for the rest of this time series. To some degree the deepening of the mixed layer is also reflected in the temperature record at 80 meters. The largest amplitude temperature variation is found at 100 and 120 meters with more than5°C amplitude. At and below 140 meters these changes do not exceed more than °C. This is consistent with the mean temperature structure as shown in Figure 2. The small temperature variations at 140 meters can be attributed to the presence of a thick extensive lamina near this level seen in Figure 2. Finally, the depth distributions of features 1 and 2 of Figure 2 have been followed as function of time. Figure 7 shows the vertical extent and depth of the 23° lamina and the 14° lamina. This should be the best evidence avail- able for internal wave studies inasmuch as no specific assumption concerning the local temperature gradient is required in transforming temperature fluctuations at a given level into vertical motions. This record, more than any other, demonstrates little correlation between these two features. Moreover, at times the upper boundary and the lower boundary of either lamina vary with different amplitude and phase. The 23° lamina is growing thicker with time and, at the same time, cooling, while the 14° lamina is decaying and warming. This discussion has been limited to a data presentation; the next step will consist of the detailed analysis
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