cgc90.dat (File 5)

This file provides hydrographic, carbon dioxide, and nitrate data for the 63 stations occupied during R/V Malcolm Baldrige CGC-90 Cruise in the Southwest Pacific. Each line of the file consists of a station number, sample ID, CTD pressure, CTD temperature, potential temperature, CTD salinity, bottle salinity, sigma-t, sigma-theta, nitrate, total CO2, and data quality flags. The file is sorted by station number and pressure and can be read using the following FORTRAN 77 code [contained in cgc90dat.for (File 3)]:

            INTEGER  sta, samp, qcfl
            REAL pres, temp, theta, ctdsal, botsal, sigma, sigmat
            REAL no3, tco2
            read (1, 10,end=999) sta, samp, pres, temp, theta, ctdsal,
          1 botsal, sigma, sigmat, no3, tco2, qcfl
     10    format (7X,I2,4X,I5,3X,F6.1,3X,F6.3,3X,F6.3,3X,F6.3,1X,F8.3,
          1 3X,F6.3,3X,F6.3,1X,F8.3,2X,F7.1,7X,I3)

Stated in tabular form, the contents include the following:

Variable Variable Type Variable Width Starting Column Ending Column
sta Numeric 2 8 9
samp Numeric 5 14 18
pres Numeric 6 22 27
temp Numeric 6 31 36
theta Numeric 6 40 45
ctdsal Numeric 6 49 54
botsal Numeric 8 56 63
sigma Numeric 6 67 72
sigmat Numeric 6 76 81
no3 Numeric 8 83 90
tco2 Numeric 7 93 99
qcfl Numeric 3 107 109

where

  • sta is the station number;
  • samp is the sample number;
  • pres is the CTD pressure (in dbar);
  • temp is the CTD temperature (in oC);
  • theta is the potential temperature (in oC);
  • ctdsal is the CTD salinity (in PSS);
  • botsal* is the bottle salinity (in PSS);
  • sigma is sigma-theta (in sigma units);
  • sigmat is sigma-t (in sigma units);
  • no3* is the nitrate concentration (in µmol/kg);
  • tco2* is the total carbon dioxide concentration (in µmol/kg);
  • qcfl is a 3-digit variable that contains data quality flag codes for parameters flagged by an asterisk in the output file.
  • Quality flags definitions:
    • 2 = Acceptable measurement;
    • 3 = Questionable measurement;
    • 5 = Not reported;
    • 9 = Sample not drown for this measurement from this bottle.

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