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:

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.