was left on station in an attempt to obtain use- 

 ful data on the near-surface conditions, but it 

 was never recovered because it apparently was 

 carried away in one of the severe gales that 

 crossed the Grand Banks during May 1968. The 

 surface buoy washed ashore near Skull, Ireland 

 in early January 1969. Station data acquired 

 during the monitoring of the buoy system are 

 presented in the Tables of Oceanographic Data 

 (Appendix A) ; no analysis is presented at this 

 time. 



A third cruise was scheduled due to the pro- 

 longed iceberg threat on the Grand Banks. It 

 included two surveys of Standard Sections A2, 

 A3, and A4 consisting of stations 10255 through 

 10324, conducted between 18 June and 27 June 

 1968. 



During a Naval Oceanographic Office ice fore- 

 cast survey (24-26 October 1968) on the 

 USCGC EASTWIND ( WAGB 279) , 15 stations 

 were occupied on the Ice Patrol transect across 

 the Labrador Sea from South Wolf Island, 

 Labrador to Cape Farewell, Greenland. 



DATA ACQUISITION AND TREATMENT 



The primary sampling instrument for the 

 1968 Ice Patrol cruises was a Bissett-Berman 

 Model 9006N Salinity-Temperature-Depth 

 (STD) sensor system. The STD data were 

 quality controlled by comparison with Nansen 

 bottle samples obtained just above the STD 

 sensor at the bottom of selected deep casts. Be- 

 cause quality control samples were obtained on 

 only 29 stations, averaged corrections were ap- 

 plied to groups of STD casts where the differ- 

 ences between the STD data and the associated 

 quality control samples exceeded the manufac- 

 turer's stated accuracy for the STD system 

 (±0.020°; ±0.03°/oo) . The quality control pro- 

 gram was severely hampered by weather and 

 sea conditions that jeopardized the STD sensor 

 when attempts were made to attach the sam- 

 pling bottle on the cable above it. 



Data processing was accomplished at sea 

 during the spring Ice Patrol with a PDP-8/S 

 computer. Dynamic heights relative to 1000 

 decibars and corrections of the quality-conti'ol 

 temperatures were computed utilizing programs 

 described by O'Hagan (1964). Anomalies of 

 dynamic height in water shallower than the 

 reference level were computed in a manner 

 similar to that described by Helland-Hansen 



(1934) ; the method is described in detail by 

 Kollmeyer (1967). Current velocities at se- 

 lected levels between adjacent oceanographic 

 stations were computed using the geostrophic 

 equation. Volume transports were computed 

 through the solenoids formed by the intersec- 

 tion of the selected levels and the oceanographic 

 casts (method described in detail by Kollmeyer, 

 1967). 



The temperature and salinity data acquired 

 during the October occupation of the section 

 between South Wolf Island, Labrador and Cape 

 Farewell, Greenland were obtained by Nansen 

 bottle casts and processed later at the Coast 

 Guard Oceanographic Unit in Washington, 

 D.C., with a PDP-5 computer. The treatment 

 of the data was similar to that accorded the 

 three cruises in operational support of the Ice 

 Patrol, except that dynamic heights were com- 

 puted relative to 1500 decibars, and salt and 

 heat transport were computed in addition to 

 volume transports. The methods used to com- 

 pute salt and heat transports are described in 

 detail by Kollmeyer (1967). 



The data presented in the Tables of Ocean- 

 ographic Data (Appendix A) are reproduced 

 from computer listings from the National 

 Oceanographic Data Center (Cruise Nos. 31- 

 8039 and 31-1353). Anomalies of dynamic 

 height in the listings were computed by NODC, 

 but all discussion of dynamic heights in the text 

 and related computations in this report are 

 based on dynamic heights computed by the 

 Oceanographic Unit. 



The oceanographic work of the first Ice Pa- 

 trol cruise was directed by Lt. James M. Sea- 

 brooke, USCG, who was assisted by Lt. Charles 

 W. Morgan, USCG. Lieutenant Morgan directed 

 the second and third cruises assisted by Ens. 

 Henry S. Andersen, USCGR, and Mr. Joseph 

 Shuhy, Oceanographer. Technical assistants for 

 the Ice Patrol season were Sonarman First 

 Class William T. O'Brien, Aerographer's Mate 

 First Class Peter R. San Jule, Aerographer's 

 Mate First Class William E. Heller, Aerog- 

 rapher's Mate Third Class Michael L. Combs, 

 Aerographer's Mate Third Class Rex Allen C. 

 Doescher, Sonarman Third Class Kenneth L. 

 Mitchell, Aeoragrapher's Mate Third Class 

 Marshall R. Patmos, Aerographer's Mate Third 

 Class Kenneth D. Thoeni, and Sonarman Third 

 Class Calvin C. Wood. 



