FIELiD PARTY PERSONNEL 



Capt. Barnes Collinson - Master 



Joseph E. King 

 Gunter R. Seckel 

 Robert M. Kodama 

 Roy V. Henrickson 

 Robert L. Pyle 



Field Party Chief 

 Oceanographer 

 Physical Science Aid 

 Fishery Aid 

 Collaborator (Univer- 

 sity of Hawaii) 



ITINERARY OF THE CRUISE 



September 23 

 September 26 

 October 16 



October 20-23 



October 24 

 October 27 



November 23 

 November 24-30 



December 1 



December 9 



December 10 

 December 12 



December 17 



- Departed Pearl Harbor , 



Hawaii. 



- Started plankton and trawl 



stations at 12° N. , 156°W. 



- Suspended station activities 



at 12°N. , 112°W. andheaded 

 for Manzanillo, Mexico. 



- Anchored in Manzanillo har- 



bor, taking on fuel, fresh 

 water, and other stores. 



- Departed Manzanillo. 



- Resumed plankton and trawl 



work and started hydro- 

 graphic and C^"^ stations. 



- Arrived Nuku Hiva, Mar- 



quesas Islands. 



- Conducted a bait survey, 



surface trolling, and scout- 

 ing for tuna in the Marque - 

 sas Islands. 

 -Departed the Marquesas 

 Islands to resume plankton, 

 trawl, and C stations. 



- Arrived Christmas Island, 



Lilne Islands. 



- Departed Christmas Island. 



- Stopped at Palmyra Island 



to pick up four persons 

 from a vessel which had 

 recently run aground off 

 the island. 



- Returned to Pearl Harbor, 



Hawaii. 



ACC OMP LISHMENTS 



Eastbound Leg 



The northern boundary of the Equatorial 

 Countercurrent was crossed eight times on the 

 eastbound leg (fig. 1), with bathythermograph 

 lowerings at 2-hour intervals. Surface samples 

 were collected twice daily for inorganic phos- 

 phate and salinity determinations. 



A total of 42 closing -net hauls with 

 sampling at 3 levels, 42 standard 200 -meter 



oblique hauls, 8 oblique hauls between 200 and 

 300 meters, and 21 midwater trawl hauls were 

 connpleted during this portion of the cruise. 



A GEK measurement of surface currents 

 was made 4 times daily running east of 156°W. 

 longitude, for a total of 48 fixes until the instru- 

 ment became inoperative by failure of the sup- 

 pressor (condenser) assembly. 



At the beginning of the cruise some 

 excellent records of the evening rise in the 

 scattering layer were obtained with the EDO 

 depth sounder. The instrument soon went out 

 of commission, however, and could not be re- 

 paired at sea. 



Westbound Leg 



Thirty-five hydrographic stations were 

 completed on the westbound portion of the cruise 

 with Nansen bottle casts to either 1 , 000 or 1 , 200 

 meters. The oxygen and most of the inorganic 

 phosphate determinations were made at sea; 

 some of the samples were frozen for later phos- 

 phate analysis in the laboratory. Water samples 

 were retained for salinity determinations ashore. 

 Bathythermograph lowerings were made on sta- 

 tion and at 2 -hour intervals between stations. 

 In addition, surface phosphate and salinity sam- 

 ples were taken on runs without full hydrogra- 

 phic stations, 



A total of 72 closing-net hauls with 

 sampling at 3 levels, 80 oblique, open-net hauls 

 between the surface and about 200 meters, 8 

 oblique hauls at 200-300 meters, and 32 mid- 

 water trawrl hauls were connpleted on the iwest- 

 bound leg. 



With e quipment provided by the 

 University of Hawaiii.' , and through the efforts 

 of Mr. Robert Pyle, the rate of carbon fixation 

 was measured at 76 stations (438 samples). 

 Chlorophyll determinations were made either 

 once or twice daily at 44 stations. 



A prominent front with4*F. temperature 

 change was encountered at about 4°N. latitude, 

 120* W. longitude. About 15 hours were spent 

 in the frontal area during which 29 BT casts, 7 

 surface plankton hauls. 1 pelagic trawl haul, 

 and 2 night-light collections were made. 



— This work was supported in part by 

 financial assistance from contract AT-(04-3) -15 

 between the Botany Department of the University 

 of Hawaii and the U. S. Atomic Energy Com- 

 mission. 



