Parachute current drogues were launched in sets from sites 1 

 to 5 on 16 and 17 September, 17 to 19 September, 25 and 26 September, 

 29 September to 1 October, and 10 and 11 October, respectively. 



A current meter array was anchored near San Nicholas Island on 

 17 September and was retrieved on 15 October. 



Additional data included 51 sound velocimeter lowerings, 19 bottom 

 sediment samples, photographs from four bottom camera lowerings, 14 

 plankton samples, and 24 ba thy thermograms on Nansen stations 2 through 

 25 during October. 



III. METHODS AND PROCEDURES 



A. Instrumentation and Data Collection. 



1. Nansen Cast . Serial-depth temperatures and salinities were 

 sampled throughout the water column on standard Nansen cast stations. 

 Attempts were made to collect data as close to the bottom as possible. 

 Protected deep sea reversing thermometers were used on each Nansen 

 bottle to obtain in situ water temperatures, and unprotected reversing 

 thermometers were spaced throughout the casts to obtain reversal 

 depths of the Nansen bottles. 



A water sample was drawn from each Nansen bottle and analyzed 

 for salinity aboard ship with an Industrial Instruments inductive 

 salinometer. Salinities are considered accurate to +0.01%>o. 



During September, additional water samples drawn from the Nansen 

 bottles were analyzed for dissolved oxygen content aboard ship using 

 the NAVOCEANO modification of the Winkler method. 



2. Sound Velocimeter . A Ramsay sound velocimeter, with an AOODDS 

 printout system, was used only at anchor stations to supplement hand 

 computed sound velocity data. The velocimeter was lowered every 



two hours and simultaneously with the Nansen casts which were taken 

 every 4 to 6 hours. In the latter case, the 100-pound lead weight, 

 normally used at the end of the oceanographic wire, was replaced 

 by the velocimeter. 



3. Parachute Current Drogu e. At site 1 (Fig. 2), three drogues 

 were launched with parachutes at depths of 5, 25, and 50 meters. 



At sites 2 through 5, four drogues were launched at each site with 

 an additional drogue at 100 meters. 



The drogue assembly, illustrated in Figure 3, included a 30-foot 

 diameter parachute, a styrofoam log as the surface float, and two 

 10-foot aluminum poles connected together with approximately 15 feet 

 extending above the water surface. Attached to the upper portion 

 of the pole was a flag for day and a flashing light for night identification 

 and a radar reflector for tracking the drogue in calm seas. A 3/32-inch 



