Technical Report
 

An oceanic microstructure measuring system

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https://ir.library.oregonstate.edu/concern/technical_reports/ww72bc83f

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  • Our primary purpose in developing this instrument is to measure vertical temperature fluctuations in the ocean to the smallest scales at which they exist. This goal dictates the basic concept of the instrument, as C. S. Cox saw in the 1960's. Vertical temperature changes are seen as changes with time of the temperature sensed by a thermistor mounted on a freely-falling instrument. Because the response time of available thermistors presents a limitation, rate of descent must be slow. In order that the time series can be interpreted as a spatial record, the descent must be smooth, as it cannot be if the instrument hangs from a ship. On the other hand, in order for the fluctuations to appear "frozen" as the sensor passes through them, as we would like, the descent rate must be kept substantially faster than the small-scale motions in the water. It turns out that descent rates of 5-15 cm/sec can be profitably used. Another approach is to use a much faster-responding sensor which can resolve the temperature fluctuations while falling much faster (Elliott and Oakey, 1975). This approach has its own set of problems which will not be discussed here.
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