A predictive horizontal-temperature-gradient model of the upper 750 feet of the ocean: derived from towed-thermistor-chain data taken in 17 geographical areas of the Eastern North Pacific
Time-dependent horizontal-temperature gradients were computed from vertical-temperature cross sections taken with the towed thermistor chain in 17 areas of the eastern North Pacific. The horizontal gradients were found to be generally smaller than the vertical gradients by two orders of magnitude. The horizontal-gradient field alternated regularly in sign, implying a dominant frequency of internal waves or convection cells (with a corresponding wavelength of 0.72 nautical mile). The horizontal gradient in the thermocline can be predicted from the measured vertical gradient by means of the equation: dT/dx = 0.0047(dT/dz) to the 0.71 power. On the basis of these results, plus a single bathythermograph lowering, a simplified predictive model of the horizontal-temperature gradients was constructed. (Author).
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17 sample areas 70th percentile acoustic intensity Acoustical Society analysis Baja California bathythermograph C/ft CD CD Celsius CN o CN computed contoured convection cells cycle per minute data sections depth ranges dominant frequency Ensemble average spectrum field for Sample Figure gradient field gradient increases gradient-strength Hid3Q Hld3Q horizontal gradients internal waves interval isotherm depth isothermal surfaces July Laboratory Report LaFond and LaFond low-pass filtering low-pass-filtered mean wavelength microstructure Microther modal distribution nautical mile ocean orders of magnitude power spectrum Predicted horizontal-temperature-gradient pycnocline ro o CN slope smoothed structure SMOOTHED TEMPERATURE STRUCTURES Society of America southern tip spectral standard deviation temperature data temperature gradient thermal structure Thermistor Chain Cruise Thermistor Chain data thermocline Time-dependent horizontal-temperature gradients tip of Baja towing depth U.S. Navy upper 750 feet values vertical and horizontal vertical gradient vertical stability vertical variations vertical-temperature gradient vertical-temperature-gradient field waves or convection