INTRODUCTION 
This report descvzibes the results of the second of a series of 
experiments v.hich are being conducted with the tvofold aim of obtaining 
extended temperature measurements in the ocean and of diveloping reli- 
able equipment for such measuvements. Temperature measuvements are 
impovtant in understanding such features of near-su~face ocean behavior 
as internal waves or surface sound channel propagation, 
Early experinents have quite often led to the conclusion that 
the observed temperatuve fluctuations could be described as a simple 
harmonic wave o~ as a combination of a few such waves Usually these 
analyses have been pe-formed on data of inadequate duration o~ with im- 
propevly designed instvuments. 
More recent experiments, of adequate time duration, show markedly 
different zesults. The first, Operation STANDSTILL, utilizing BT's taken 
every half-hour for 25 days from an anchoved ship, finds peaks at periods 
of one and five days in the power grrecine 2 The second, utilizing data 
taken by thermistors placed on the ocean bottom near Bermuda, for many 
months, finds a spect7um which decveases monotonically with frequency as 
-3 3 . a s Sle 
ft as vell as evidence for the existence of a peak at the principal 
lunar tide and a peak at O 5 cycles per none. 8 
The experiment described here is for data of one day's duration 
taken at two-minute intervals and hence yields information on the power 
spectra of the temperature fluctuations to a higher» frequency range than 
given in the references cited in Footnotes 1 and 2. 
2 Brown, Corton. and Simpson, Power Spectrum Analysis of Internal Waves 
f-om Operation STANDSTILL (U. S. Navy Hyd-ographic Office, 1955), 
Technical Report TR-26 
Hauzwitz, Storimel, and Munk, On the thermal unrest in the ocean. In 
Rossby Memorial Volume (Rockefelle> Institute P~ess, New York, 1959). 
