Oceanographic Unit via radio teletype about every 

 5 days. In addition, duplicate samples were drawn 

 from the top and bottom bottles of each cast and 

 delivered to the Coast Guard Oceanog;raphic Unit 

 for the purpose of quality control when the vessel 

 returned to port. 



Processed temperature and salinity data for 

 each cruise were recorded on form NODC-EXP- 

 3167/25 (3-64), Physical and Chemical Data form 

 for Oceanographic Data, and delivered to the 

 National Oceanogi-aphic Data Center (NODC), 

 Washington, D.C. The interpolated temperatures, 

 salinities, sigma-t values, geopotential anomalies 

 (AD) and sound velocities for the standard 

 depths were computed by NODC and listings pro- 

 vided for the preparation of tables I- VIII. 



CRUISE NARRATIVES 



The U.S. Coast Guard time-series oceano- 

 graphic project at Ocean Station DELTA was ini- 

 tiated in July 1966 by the USCGC ESCANABA. 

 During the period from 15 July to 2 August 1966 

 the USCGC ESCANABA occupied a total of 18 

 oceanographic stations in the vicinity of Ocean 

 Station DELTA. Two stations had maximum 

 sampling depth of less than 1,000 meters due to 

 very large wire angles. A large number of the 

 stations had wire angles in excess of 40°. The deep 

 cast had a maximum sampling depth of only 2,352 

 meters in a water depth of 5,084 meters due to a 

 failure of the winch during the cast. The USCGC 

 ESCANABA had gi-eat difficulty maintaining 

 position within the Ocean Station gi'id as is evi- 

 denced by the plot of the station positions in 

 figure 2. The data are listed by NODC as Ref. 

 No. 31-699 EN and as table I of this report,. The 

 USCGC ESCANABA also conducted continuous 

 plankton sampling tows to and from Ocean Sta- 

 tion DELTA for the Scottish Marine Biological 

 Association, Edinburgh, Scotland. A total of 871 

 miles of continuous sampling was accomplished 

 and the samples shipped to Scotland for 

 processing. 



During the 27 August to 16 September 1966 

 patrol of the USCGC CAMPBELL at Ocean Sta- 

 tion DELTA, a total of 13 oceanographic stations 

 were successfully occupied. One station had a 

 maximum useful depth of only 172 meters due to 

 the post-tripping of the bottles below this level. 

 Three casts had maximum sample depths of less 

 than 1,200 meters due to large Avire angles. The 

 deep cast had a maximum usefid depth of only 



3,357 meters in a water depth of 4,572 meters as 

 a result of the last two bottles failing to trip. The 

 distribution of all the stations about the center of 

 DELTA is shown in figure 3. The ship re^wrted 

 heavy easterly undercurrents during the first half 

 of the patrol and westerly currents during the 

 latter half. The data are listed by NODC as Ref. 

 No. 31-762 CM and as table II of this report. 



The USCGC HUMBOLDT successfully con- 

 ducted 17 oceanographic casts during the 11 Octo- 

 ber-2 November patrol on DELTA. One cast had 

 a maximum useful depth of only 744 meters as a 

 result of the post-tripping of bottles below this 

 level. Another cast had a maximum useful depth 

 of 1,218 meters due to a very large wire angle 

 (55°). The remainder of the casts had maximum 

 useful depths between 1,300 and 1,900 meters. Two 

 deep casts were accomplished with maximum sam- 

 pling depths of 3,712 and 4,498 meters in water 

 depths of 4,625 and 4,599 meters, respectively. The 

 USCGC HUIVIBOLDT also conducted continuous 

 plankton sampling tows to and from Ocean Station 

 DELTA for the Scottish Marine Biological As- 

 sociation, Edinburg, Scotland. A total of 850 

 miles of continuous plankton sampling was accom- 

 plished and the plankton samples were returned to 

 Scotland for processing. The distribution of the 

 stations about the center of DELTA is shown in 

 figure 4. The data are listed by NODC as Ref. No. 

 31-772 HU and as table III of this report . 



During the 26 November-18 December 1966 

 DELTA patrol, the USCGC CHINCOTEAGUE 

 successfully occupied 16 oceanographic stations. 

 The maximum useful depths ranged from 1,200 

 to 1,700 meters with one cast having a maximum 

 useful depth of 1,111 meters due to the malfunc- 

 tion of the thermometers on the deepest bottle. Two 

 deep casts were accomplished with maximum use- 

 ful depths of 2,519 and 3,574 meters in a water 

 depth of 4,572 meters in both cases. The distribu- 

 tion of the stations about the center of DELTA is 

 shown in figure 5. The data are listed by NODC as 

 Ref. No. 31-826 CC and as table IV of this report. 



The USCGC DUANE successfully occupied 11 

 oceanographic stations during the 10-31 January 

 1967 patrol on DELTA. Two casts had maximum 

 useful depths of only 743 and 748 meters as a 

 result of excessive wire angles causing pretripping 

 of the deeper bottles. The remainder of tlie casts 

 had maximum useful depths ranging from 1,100 

 to 1,600 meters. One deep cast was accomplished 

 with a maximum uesful depth of 3,985 meters in a 



