TABLES 



1 Depth factors for conversion of linear scale to 



true depth . . . page 8 



2 Time and location of thermistor chain data 



samples used for analysis ... 34 



3 Cumulative distribution of slopes of isotherms . . .46 



4 Autocorrelation (R x ) of successive half-minute 



readings of isotherm depth . . . 49 



5 Slope of log-log relationship between power 



spectrum and frequency . . . 67 



ILLUSTRATIONS 



1 The oceanographic research vessel USS MARYSVILLE 



and thermistor chain ... page 2 



2 Thermistor chain towing technique ... 4 



3 The pattern of thermistor-chain towing ... 5 



4 Two intersecting trains of internal waves . . . 7 



5 Location of thermal structure examples ... 9 



6 Common thermal structure . . . 10 



7 Thermal structure - inversions . . . 11 



8 Thermal structure - cold intrusion area . . . 13 



9 Thermal structure - ridge ... 14 



10 Location of sample sections of thermal 



structure data . . . 17 



11 Smooth thermal structures ... IS 



12 Normal thermal structures . . . 22 



13 Rough thermal structures . . . 26 



14 Irregular thermal structures . . . 30 



15 Location of samples used in analyzing isotherm 



characteristics . . . 32 



16 Sample of original data ... 37 



17 Cumulative percentage distribution of depth 



differences . . . 38 



18 Frequency distribution of slopes . . . 40 



19 Direction of tow vs average median vertical isotherm 



angle of shallow isotherms . . . 42 



20 Direction of tow vs average median vertical isotherm 



angle of deep isotherms . . . 43 



