conducted to provide input to a real-time numeri- 

 cal model of the Labrador Current (Kollnieyer, 

 1975). Following occupation of sections A3, 

 A2B, and A'2C, the intensive survey was repeated 

 between 3-G June to allow for the verification of 

 the numerical model. 



The, second segment of the cruise involved n 

 dual ship study of iceberg drift. While the 

 USCGC SHERMAN (WHEC 720) stood by a 

 medium size iceberg as it drifted, the CGC 

 EVERGREEN made four sections, totaling 43 

 STD stations, perpendicular to the path of the 

 iceberg's drift. The final .section occupied coin- 

 cided with IIP standard section AlA. The ice- 

 berg was followed for a period of four days 

 (15-19 June). 



During the final .segment of the .second IIP 

 cruise the current meter array deployed on 13 

 April 1975 was recovered on 27 June 1975. On 

 28 June Standard Monitoring Section Al was 

 occupied beginning at the shallow (West) end. 

 The trackline was then retraced dropping an 

 XBT probe approximately every mile (57 XBT 

 casts) after which section Al was repeated on 

 1 July. 



Hourly XBT measurements were again made 

 for the National Marine Fisheries Service under 

 the same guidelines applied to the first cruise. 

 These data are presented in Cook (1975). 



The scientific party for the second IIP cruise 

 was 



LCDR R. Scobie— Field Party Chief 



MSTC N. Lemoine — Watch Supervisor 



MSTC R. Lindsay — AVatch Supervisor 



MSTl A. Filo 



MSTl M. AUes 



MST3 S. Friday 



MST3 D. Startt 



MST3 S. Popovitch 



SNMST J. Murdy 



SNMST K. Munzert 



SNMST J. Ferguson 



ET2 J. Ogle 



Standard Section Occupations — A2, A3, A4 



The USC(iC CHASE (WHEC 718) occupied 

 standard sections A2, A3, and A4 between 2-17 

 February. The measurements were made using 

 Nansen bottles with deep sea reversing thermom- 

 eters. The CGC CHASE reoccupicd the-sc same 

 sections between 30 Augusts September using 



an STD profiling system. A third <x>cupation 

 of standard sections A2, A3, and A4 was accom- 

 plished by the USCGC HAMILTON (WHEC 

 715) from 15 to 23 November using Nansen 

 liottles witli reversing thermometers. 



INSTRUMENTS AND METHODS 



IIP Cruises: The STD measurement.s were 

 made with a Ples.sey 9040 STD profiling system. 

 The tliree analog FM signals from the STD deck 

 unit (depth, temperature, and salinity) were 

 converted to binary decimal frequency values 

 (integer cycles per second) by General Radio 

 Model 1192 frequency countei-s and digitized by 

 u Sonycraft Co. Digital Data Logger (DDL). 

 The digitized frequency values were then re- 

 corde<l on i^ inch computer compatible seven 

 track magnetic tape by a Kennedy 1600R incre- 

 mental tape recorder. The observations of depth, 

 temperature, and salinity were made simul- 

 taneously at a one second rate antl recorded 

 serially on the magnetic tape. 



The recorded data was processed through a 

 series of three programs on a CDC-3300 com- 

 puter to yield the final data values listed in this 

 report. The original data tape was input to 

 program NEW'DL which converted the frequency 

 data to geophysical units. The converted data 

 was both printed out and written on a separate 

 magnetic tape. From the printout the first and 

 last good data levels were determined, as were 

 values for comparison with quality control 

 samples to derive temperature and salinity cor- 

 rection values (see below). The NEWDL output 

 tape was used as input to program AVMUL. 

 This program deleted all observations in which 

 the depth decreased from the previous obser^'a- 

 tion, applied the quality control correction values, 

 calculated sigma-t for each observation, averaged 

 temperature and salinity values for observations 

 at the .same depth, and from those determined an 

 average sigma-t at each depth. The output of 

 AVMUL was both a printout and a magnetic 

 tape. The printout was reviewed to identify bad 

 data points which resulted in unrealistic insta- 

 bilities in the water column, primarily due to the 

 slow thermometer response time in regions of 

 sharp thermal gradient. The stability criteria 

 used is that established by the National Oceano- 

 grai)hic Data (\*nter. The A\'MUL output tape 

 was input to program FINPT which deleted 

 selected levels, reaveraged the values at common 



