thermometers manufactured by Kicliter and 

 Wiese, Kahl Scientific. Instrument Corp., and 

 Walter H. Kessler Co., Inc. The temperatures 

 were obtained from paired averages and are con- 

 sidered accurate to ±0.01° C. The salinity of 

 each sea water sample collected was measured with 

 an KS-7A inductive salinometer manufactured by 

 Industrial Instruments Corp. It is considered 

 that the precision of measurement was within 

 ±0.005%<. and that the accuracy of the reported 

 salinities is ±0.01%o. Water samples were also 

 obtained for dissolved oxygen analysis by the 

 Modified Winkler method according to the meth- 

 od described by Jacobson et al. (1950). Addi- 

 tional water samples were bottled and frozen for 

 later analyses of the nutrient content by David A. 

 McGill of the Woods Hole Oceanographic Institu- 

 tion, and the results are included as a separate 

 paper. 



The temperature distribution of the water in 

 the upper 400 meters was examined just prior to 

 making a Nansen cast and at many locations be- 

 tween Nansen stations. This was accomplished 

 by using a Hytech Corp., electronic bathytheiTno- 

 graph (ELBT) Model 480 MOD 1. 



A standard Phleger, 1 foot, gravity corer was 

 used to obtain samples of the sediments at selected 

 locations. In areas of rock and sand bottoms, 

 clamshell grabbers and orange peel bucket samples 

 were used. These sample^s are still being analyzed, 

 and therefore the data are not presented herein. 



DATA TREATMENT 



The temperatui'e and salinity data obtained at 

 each station were processed on the Digital Equip- 

 ment Corp. PDP-5 computer as discussed by 

 O'Hagen (1964), and Morse and O'Hagen (1964). 

 This was accomplished shortly after the comple- 

 tion of each station. Values of sigma-t and 

 dynamic heights based on the 1,000-decibar level 

 were detennined at each sample depth. Computer 

 interjDolation for the Ice Patrol standard levels 

 was performed according to Kollmeyer (1964). 



The oceanographic work was under the direc- 

 tion of Lt. Comdr. Eonald C. Kollmeyer, USCG, 

 who was assisted by Mr. Thomas C. Wolford, 

 oceanographer, Lt. (jg.) John Goras, USCGR, 

 and Mr. John Flick, electronic technician. Tech- 

 nical assistants were William H. Harrell, sonar- 

 man first class, David J. Wood, sonarman second 

 class, Edward S. Olszewski, sonarman second 

 class, William F. Heller, aerographer's mate sec- 



ond class, and James D. Brower, aerographer's 

 mate third class. 



Dynamic heights of the sea surface were sum- 

 med using both observed specific volume anomaly 

 values and the interpolated standard deptii values. 

 Determinations of dynamic heights in shallow 

 water were performed in the manner described by 

 Helland-Hansen (1934). This method assumes 

 that level isosteric surfaces extend from the water- 

 sediment interface, on the continental slope, into 

 the bottom of a point directly below the next serial 

 station. This method allows the extension of the 

 pressure surfaces, related to the 1,000-decibar 

 level of no motion, above the shelf as far as the 

 coast. Facilitation of these shallow water com- 

 putations is accomplished by constructing a prop- 

 erty section, along a line of stations, for both 

 temperature and salinity. The isotherms and 

 isohalines are then extended or extrapolated to 

 points along the bottom. Where doubt existed as 

 to isopleth contours near the bottom, vertical dis- 

 tribution curves of temperature and salinity for 

 the questioned stations were drawn and the re- 

 quired bottom data extrapolated. By this pro- 

 cedure, temperature and salinity values at the bot- 

 tom, beneath each station, were established as well 

 as values at significant points of bottom topog- 

 raphy slope changes. Data points were then 

 available for temperature and salinity values at the 

 standard depths and along the bottom to supple- 

 ment the observed values, thereby providing a close 

 approach to completely describing the water 

 column from the surface to the bottom or 1,000 

 meters as the case may be. All of the data points 

 of temperature and salinity were then processed in 

 the computer and the i-elative dynamic lieight at 

 each value point determined. 



Tlie depth values of tlie 26.:2 and '27.0 sigma-t 

 surfaces were interpolated by computer from the 

 complete data array. In addition, the nitrite 

 (NOn — N) concentrations at the depth of these 

 sigma-t surfaces were obtained by computer inter- 

 polation thus allowing prepai'ation of isentropic 

 charts with nitrite concentration contoui's. They 

 are presented in a subsequent section. 



Volume flow computations were accomplished 

 by a computer program specifically written to pro- 

 vide transport information tlirough vertical prop- 

 erty sections. The program provides volume flow 

 information through solenoids which subdivide a 

 property section into small i-ectangles. The so- 

 lenoids are bounded by the data obtained from 



