# 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 CO_{2}, 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
^{o}C); - theta is the potential temperature (in
^{o}C); - 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.