24 



PROCESSING OCEANOGRAPHIC DATA 



105«,,p: Entries are found from table VI, page 80, 

 at appropriate values of temperature and depth. 

 The quantity 5,.^ represents the part of the specific 

 volume anomaly, S, which is due to simultaneous 

 variation of temperature and pressure from standard 

 values. 



10*«,,c: Entries are found from table VII, page 84, 

 at appropriate values of salinity and depth. The 

 quantity 5,,p represents the part of the specific 

 volume anomaly, 5, which is due to simultaneous 

 variation of salinity and pressure from standard 

 values. 



lO^i: Entries are obtained by adding the three terms 

 "105A,.,," "1055,.„," and "lO^Si.p." The quantity 

 a is the difference between the actual specific volume 

 at each level and a standard value at that level, 

 the standard being the specific volume of water of 

 standard salinity and temperature (35°/oo and 0° C.) 

 at the appropriate pressure. In accordance with the 

 formula given in section D. 3, 



p — «35.0.p- 



,+ «..p + S., 



MEAN 5: By eliminating the factor 10^ the mean value 

 of the anomaly between each two successive levels 

 is found and entered in this column. 



PRESSURE interval: Since the pressure interval in 

 decibars between two levels is very nearly equal 

 to the depth interval in meters, entries for this 

 column are the intervals between successive depths, 

 taken from the first column of the form. 



AD: The anomaly of dynamic height for each layer in 

 dynamic meters. Each entry is the product of the 

 mean specific volume anomaly for the layer and the 

 pressure interval, that is, the product of the entries 

 in the preceding two columns. 



SAD: The anomaly of dynamic height from the surface 

 to each level in dynamic meters. Each entry is the 

 cumulative sum of the anomalies of dynamic depth 

 of the layers above, as given in the preceding column. 

 These values are used to determine relative current 

 as discussed in section D. 3. 



OCEANOGRAPHIC DATA SUMMARY 



To summarize the processed data for plot- 

 ting, analysis, or publication, a fourth form, 

 " Oceanographic Data Summary," is presented 

 as figure 25. This form gives the corrected 

 observed, interpolated, and most common 

 computed values. 

 Explanation of Entries in Columns 

 OBSERVED DATA: 



DEpyH (M): Entries are copied from the last column 

 of Form 2, "ACCEPTED DEPTH," and represent 

 the best determination of depth. 

 temperature (°C) : Entries are copied from the col- 

 umn on Form 2 labeled "AVERAGE T„" and rep- 

 resent the best determination of temperature. 

 SALINITY (°/oo): Entries are taken from results of the 

 chemical analysis of the water sample for salinity. 



ff,: Entries represent, in abbreviated notation, density 

 of the water at salinity and temperature in situ and 

 at atmospheric pressure. ffi=10^ (pj.i.o— !)• Col- 

 umn entries are found by graph, nomogram, special 

 shde rule, or by tables, by using the temperature and 

 salinity given in the preceding two columns. (See 

 sec. D. 3.) 



O2 (ml/L) : Oxygen content of the water at each ob- 

 served level. Entries are taken from the results of 

 the chemical analysis of the water sample for dis- 

 solved oxygen. 



INTERPOLATED DATA: 



depth (M), TEMPERATURE (°C), AND SALINITY (°/oo): 



Entries in these three columns are copied from the 

 first three columns of Form 3. 



ffi: An abbreviated notation for water density at the 

 salinity and temperature of each standard depth and 

 at surface pressure. Entries may be found, as indi- 

 cated above, by the use of graph, nomogram, special 

 slide rule, or tables. However, if ICA,., has been 

 determined for standard depths on Form 3, a, may 

 be found most easily from table VIII. 



02 (ml/L) : Oxygen content of the water at each stand- 

 ard depth. Entries are found by plotting observed 

 values against observed depths, drawing a smooth 

 curve, and reading from the curve the oxygen con- 

 tent at standard depths. 



CALCULATED QUANTITIES (at standard depths) : 

 S: The specific volume anomaly, obtained from the 

 column "10*5" on Form 3 by multiplying by 10-'. 

 (r,,, „: An abbreviated notation for water density in 

 situ, a,,i,p, obtained as follows: Add the specific 

 volume anomaly in the preceding column to the 

 standard specific volume at the appropriate pressurSi 

 found in table IV, to obtain the specific volume in 

 situ. Invert this value to obtain density in situ- 

 Abbreviate this figure by subtracting one and moving 

 the decimal to obtain the value to be entered in this 

 column. 



5+O35.0,l> = 0'j.l.p 



(p..,.p-l)103 = <r.,,,p. 



2AD: The anomaly of dynamic depth from the sur- 

 face to each level, copied directly from the last column 

 of Form 3. 



Blank columns are left under the general head- 

 ings OBSERVED, INTERPOLATED, and 

 COMPUTED for additional data as desired. 



HORIZONTAL CHARTS AND VERTICAL 

 SECTIONS 



The presentation of processed physical ocean- 

 ographic data in graphical form for analysis and 

 publication is most useful, since the oceano- 



