tions was reported. Oxygen concentrations 

 were determined by the modified Winkler 

 method (Thompson and Robinson, 1939). Inor- 

 ganic PO4-P was determined by the procedure 

 of Robinson and Thompson (1948) as modified 

 at the University of Washington. All thermom- 

 eters had been calibrated at HL since April 

 1962. The reported temperatures are esti- 

 mated to be accurate to +0.02° C. Application 

 of corrections to protected and unprotected 

 thermometer readings and computations of 

 thermometric depths and L-Z values were per- 

 formed with an IBM 7040 digital computers/at 

 the University of Hawaii Computing Center with 

 a program written at HL. Depths were deter- 

 mined by the use of values from the L-Z curve 

 for the actual depth. This procedure gave depth 

 estimated to be within +10 m. down to 1,000 m. 

 and within +1 percent below 1,000 m. 



Sigma-t, specific volume anomaly, and the 

 dynamic height were computed on the IBM 7040 

 computer by the program prepared at HL and 

 based on equations given by LaFond (1951). 

 The computer also was used to interpolate all 

 properties at standard depths by means of a 

 subroutine furnished by the University of Wash- 

 ington Oceanography Department and based on 

 the interpolation method outlined by Rattray 

 (1962). 



In the region of study, a sharp thermocline 

 generally separates a surface mixed layer from 

 the subsurface waters. Only infrequently do 

 Nansen casts adequately define this configura- 

 tion, with the result that the interpolation pro- 

 gram provides inaccurate values for tempera- 

 ture. BT data were used to correct the tem- 

 perature-depth curve in the thermocline and 

 the isothermal layer. When necessary, a value 

 of temperature was chosen from the corrected 

 curve at standard depths in the mixed layer and 

 upper thermocline and, with the corresponding 

 salinity value from the T-S curve, was used 

 with the Nansen cast data in the interpolation 

 program. The resulting interpolated values 

 were much nearer the actual oceanographic 

 situation as implied by the BT trace. 



To estimate the validity of values for the 

 surface distribution charts, the surface intake 

 values of temperature and salinity were com- 

 pared, for each cruise, with values from the 

 surface Nansen bottles when available. For 

 temperature, variation was fairly random, so 

 that the mean of the difference between the two 

 values was well within the accuracy of the 

 surface bucket thermometer. Variations were 



large, however, and the root mean square value 

 computed from above differences was as much 

 as 0.5° C. The bucket salinity values also 

 showed large variations with a mean of the 

 differences of about 0.005 °/oo and a root mean 

 square value within 0.12 °/oo for each cruise. 



PRESENTATION OF DATA 



For each of the three cruises the original as 

 well as derived data and section plots for the 

 properties have been included. 



Tables 1, 2, and 3 contain the oceanographic 

 station data for cruises 16, 17, and 21, respec- 

 tively. In addition to the position, date, and 

 time at each station, weather and sea conditions 

 in standard notation have been included in the 

 heading of each station. The first five columns 

 of each station listing show the observed depth, 

 temperature, salinity, oxygen, and phosphate, 

 respectively; the next two columns contain cal- 

 culated sigma-t and specific volume anomaly 

 for the observed data. The next three columns 

 present the interpolated values of temperature 

 and salinity at standard depths and the last 

 three columns contain sigma-t and the specific 

 volume anomaly calculated from the interpo- 

 lated data and the anomaly of dynamic height 

 summed from the surface. The error terms, 

 defined by the Rattray interpolation technique, 

 that exceeded 0.10 for temperature and 0.05 for 

 salinity have been noted below the tabulation 

 for each station. Interpolated and extrapolated 

 values as well as irregularities in the original 

 data are noted in these tables. 



Temperature distribution sections along long. 

 148° W., 151° W., 154° W., and 157° W. based 

 on the 270-m. BT's are included; so are the 

 shorter zonal sections between stations 7 and 

 8, 25 and 26, and 37 and 40. In addition, sur- 

 face temperature and salinities are presented 

 with each section. All the sections were plotted 

 automatically by the model 566 Calcomp plotter 

 with a program designed at HL. These seven 

 BT sections are shown in figures 2 through 7 

 for cruise 16 and figures 8 through 13 for 

 cruise 17. The one BT section along 154° W. 

 from cruise 21 is shown in figure 14. 



The surface temperature distributions, based 

 on intake temperature at each BT cast, are 

 shown in figures 15 and 16 for cruises 16 and 

 17, respectively. 



The surface salinity distributions, based on 

 intake salinity samples at each BT cast, are 



