control correction for that section exceeded the 

 manufacturer's stated accuracy for the STD 

 system (±0.02 C°, ±0.03°/ „,). 



The data were processed using a DDP 116 

 computer on CHINCOTEAGUE and a PDP- 

 8/S computer on COOK INLET. Dynamic 

 heights and geostrophic current data for each 

 section were transmitted to Commander, Inter- 

 national Ice Patrol in New York to provide 

 the necessary real-time information for the pre- 

 diction of iceberg drift. Data from the SHER- 

 MAN and WESTWIND surveys were returned 

 to the Oceanographic Unit for processing. 



The data from all vessels were processed 

 further and quality controlled at the Coast 

 Guard Oceanographic Unit on a PDP-5 com- 

 puter. Dynamic heights and corrections of deep- 

 sea reversing thermometers were computed 

 utilizing programs discussed by O'Hagan 

 (1964). Anomalies of dynamic height in water 

 shallower than the reference level were com- 

 puted in a manner similar to that described 

 by Helland-Hansen (1934); the methods used 

 are described in detail by Kollmeyer (1967). 

 Volume and heat transports were computed for 

 selected sections using the method of subdivid- 

 ing each oceanographic section into solenoids 

 for computations as described by Kollmeyer 

 (1967). 



The data presented in appendix A are repro- 

 duced from computer listings from the National 

 Oceanographic Data Center (NODC) in the 

 cruise listing format. Anomalies of dynamic 

 depth in the listings were computed by NODC 

 but all discussion of dynamic heights and com- 

 putations involving them in this report are 

 based on computations by the Coast Guard 

 Oceanographic Unit. 



The oceanographic work of the first and 

 second Ice Patrol cruises was under the direc- 

 tion of LCDR Martin J. Moynihan, USCG, who 

 was assisted by ENS Henry S. Andersen, 

 USCGR. Chief Marine Science Technician Wil- 

 liam T. O'Brien and Marine Science Tech- 

 nicians William M. Brown, Rex A. Doescher, 

 Richard L. King, and Marshall R. Patmos from 

 the Coast Guard Oceanographic Unit assisted 

 on the first cruise and Marine Science Tech- 

 nicians William E. Heller, Stephan N. Green, 

 Crae W. Hocke, Richard L. King, and Kevin P. 

 McGonigal, and Mr. Mack S. Barber, a student 

 trainee, assisted during the second cruise. The 



program on the CGC SHERMAN was accom- 

 plished by ship's personnel directed from the 

 Coast Guard Oceanographic Unit. The program 

 on the CGC WESTWIND was accomplished by 

 ship's personnel under the direction of ocean- 

 ographers from the Naval Oceanographic 

 Office. 



SURVEYS ON THE GRAND BANKS 



Prior to 1966 the oceanographic operations 

 in support of the International Ice Patrol were 

 conducted to obtain comprehensive areal sur- 

 veys along the eastern slopes of the Grand 

 Banks. In that year the practice of serially re- 

 occupying three standard sections (A2, A3, and 

 A4), rather than conducting a comprehensive 

 areal survey, was instituted. This practice was 

 begun (Wolford, 1969) because experience had 

 shown that large, short-term (1-2 weeks) 

 fluctuations occurred in the volume flow of the 

 Labrador Current, and therefore comprehen- 

 sive areal surveys requiring a timespan com- 

 parable to the period of the short-term fluctua- 

 tions would not be sufficiently synoptic. It was 

 hoped that rapid occupations of the three 

 standard sections would provide synoptic infor- 

 mation which would be adequate, when used 

 with the charts of average monthly surface 

 dynamic topography prepared by Soule (1964), 

 to draw conclusions about the circulation in the 

 Grand Banks region. Although the rapid occu- 

 pations of the three standard sections improved 

 synopticity, the large distances between sec- 

 tions made it difficult to relate features on one 

 standard section with similar features on 

 another standard section. To remedy this short- 

 coming, during the 1969 Ice Patrol season a 

 general survey of the oceanographic conditions 

 along the eastern slope of the Grand Banks was 

 conducted on both cruises from Cape Bonavista, 

 Newfoundland, to south of the Tail of the 

 Banks. These general surveys were followed on 

 each cruise by reoccupations of selected sections 

 to investigate phenomena of particular interest 

 and to obtain information on the persistence of 

 oceanographic features along the eastern slope 

 of the Grand Banks. 



The average surface circulation south and 

 east of the Grand Banks of Newfoundland dur- 

 ing April and May can be inferred from charts 

 of the mean monthly dynamic topography of 

 the sea surface relative to the 1,000-decibar 



