ILLUSTRATIONS 



1 Geographic locations of 17 NEL Thermistor Chain tempera- 



ture-data sample areas. . . page 8 



2 Fantail of USS MARYSVILLE and NEL Thermistor Chain and 



chain hoist. . . 10 



3 NEL Thermistor Chain data from Sample Area 8, off the 



southern tip of Baja California. . . 11 



4 Examples of low -pass -filtered NEL Thermistor Chain 



data... 15 



5 Example of vertical -temperature-gradient field. . . 17 



6 Example of horizontal-temperature-gradient field. . . 18 



7 Track of USS MARYSVILLE showing where temperature data 



were collected off the southern tip of Baja California 

 during NEL Thermistor Chain Cruise 8. . . 21 



8 Least-squares fit of a straight line to the logarithms of the 



vertical- and horizontal -temperature gradients from 17 

 sample areas and the envelope of the standard error of 

 estimate. . . 22 



9 Track of USS MARYSVILLE showing locations where tem- 



perature data were collected between San Diego and 

 Honolulu during NEL Thermistor Chain Cruise 4. . . 24 



10 Ensemble average spectrum for NEL Thermistor Chain 



Cruise 4... 25 



11 Ensemble average spectrum for NEL Thermistor Chain 



Cruise 8. . . 26 



12 Wavelength histogram for 17 sample areas. .. 28 



13 Bathythermograph taken 0815, 7 August 1962, during 



Cruise 14 of the NEL Thermistor Chain. . .30 



14 Predicted horizontal-temperature-gradient field 



model. . . 31 



15 Example from Sample Area 1 of the horizontal -temperature- 



gradient field. . . 32 



