Because the layer depth extended to 650-700 feet during this period, 

 all probe depths were modified aboard ship to cope with this unexpected 

 phenomenon . 



The array was designed in the form of three triangles with the apex 

 of each at buoy A. The large triangle was formed by buoys A, B, and C, 

 the length of the sides being 1500 feet. The medium triangle was formed 

 by buoy A and two dan buoys D and E hung from polypropylene rope, 150 

 feet from the apex A. The small triangle was formed by buoy A and two 

 dan buoys F and G hung from polypropylene rope, 50 feet from the apex A. 

 Spongex floats were used to give the electrical cable the necessary 

 buoyancy. The data from the resistance thermometers were printed out on 

 chart paper by two Brown recorders , twenty seconds being required to scan 

 all nineteen probes. Figure 3 shows part of the array streamed from 

 the USS SAN PABLO to one of the mooring buoys and Figure 4 shows a 

 close-up of one of the mooring buoys. 



Another component of the thermal array consisted of a thermistor 

 chain streamed from the USS SAN PABLO. This equipment was fabricated at 

 the Hydrographic Office ,using 14-conductor Vector cable and eleven 

 thermistor probes plus a pressure element. The chain was constructed 

 so that the pressure element and the last thermistor probe could be 

 lowered to at least 1200 feet. Each probe consisted of a previously 

 calibrated bridge circuit and provided a precise voltage to a DYMAC 

 voltage - to - frequency connector, which in turn was counted and then 

 digitally presented on paper tape at the rate of twelve data points 

 every 65 seconds. Five of the thermistor probes malfunctioned so that 

 data were collected at depths of 580, 650, 670, 690, 730, 750 and 770 

 feet, respectively. 



Mechanical 900-foot BT's and paired reversing thermometers on the 

 Nansen bottles were used to supplement the temperature data from the 

 thermal array. 



B. OTHER PARAMETERS 



In order to arrive at a satisfactory technique to obtain solar 

 irradiation measurements at sea, the SAN PABLO was instrumented with 

 pyrheliometers , incident sensing from the stem and deckhouse, and 

 reflected sensing from the stem and port/ starboard booms. Flat-plate 

 radiometers were also utilized at the stem location to record long-wave 

 incoming/reflected values. For this investigation, Days trom-Wes ton 

 Corporation recording instruments, with specially furnished ranges, 

 were installed. The instruments were found to perform well within 

 field requirements and with the flexibility of ranges available, many 

 erratic patterns previously doubtful are now believed to be fully 

 documented. Figure 5 shows the radiation instrument action used. 



The Roberts Current Meter was used to obtain profiles of water 

 movement. The meters presented no problems and a good set of current 



