tun3.dat (File 5)
This file provides hydrographic, CO2, and chemical data for the 105 stations occupied during the R/V Thomas Washington TUNES-3 Expedition. Each record contains a station number; cast number; sample number; bottle number; CTD pressure, temperature, salinity, and oxygen; potential temperature; bottle salinity; concentrations of oxygen, silicate, nitrate, nitrite, phosphate, CFC-11, CFC-12, TCO2, and TALK; and data quality flags. The file is sorted by station number and pressure and can be read by using the following FORTRAN 77 code [contained in tun3dat.for (File 3)]:
CHARACTER qualt*13
INTEGER sta, cast, samp, bot
REAL pre, ctdtmp, ctdsal, ctdoxy, theta, sal, oxy, silca
REAL nitrat, nitrit, phspht, cfc11, cfc12, tcarb, talk
10 format (5X, I3, 7X, I1, 6X, I2, 5X, I3, 1X, F7.1, 1X, F7.4,
1 1X, F9.4, 1X, F7.2, 1X, F7.4, 1X, F9.4, 1X, F7.2, 1X, F7.2,
2 1X, F7.2, 1X, F7.2, 1X, F7.2, 1X, F8.3, 1X, F8.3, 1X, F7.1,
3 1X, F7.2, 1X, A13)
Stated in tabular form, the contents include the following:
| Variable | Variable type | Variable width | Starting column | Ending column |
|---|---|---|---|---|
| sta | Numeric | 3 | 6 | 8 |
| cast | Numeric | 1 | 16 | 16 |
| samp | Numeric | 2 | 23 | 24 |
| bot | Character | 2 | 31 | 32 |
| pre | Numeric | 6 | 35 | 40 |
| ctdtmp | Numeric | 7 | 42 | 48 |
| ctdsal | Numeric | 9 | 50 | 58 |
| ctdoxy | Numeric | 7 | 60 | 66 |
| theta | Numeric | 7 | 68 | 74 |
| sal | Numeric | 9 | 76 | 84 |
| oxy | Numeric | 7 | 86 | 92 |
| silca | Numeric | 7 | 94 | 100 |
| nitrat | Numeric | 7 | 102 | 108 |
| nitrit | Numeric | 7 | 110 | 116 |
| phspht | Numeric | 7 | 118 | 124 |
| cfc11 | Numeric | 8 | 126 | 133 |
| cfc12 | Numeric | 8 | 135 | 142 |
| tcarb | Numeric | 7 | 144 | 150 |
| talk | Numeric | 7 | 152 | 158 |
| qualt | Character | 13 | 160 | 172 |
where
| sta | - | is the station number; |
| cast | - | is the cast number; |
| samp | - | is the sample number; |
| bot* | - | is the bottle number; |
| pre | - | is the CTD pressure (dbar); |
| ctdtmp | - | is the CTD temperature (°C); |
| ctdsal* | - | is the CTD salinity [on the Practical Salinity Scale (PSS)]; |
| ctdoxy | - | is the CTD oxygen concentration (µmol/kg); |
| theta | - | is the potential temperature (°C); |
| sal* | - | is the bottle salinity; |
| oxy* | - | is the oxygen concentration (µmol/kg); |
| silca* | - | is the silicate concentration (µmol/kg); |
| nitrat* | - | is the nitrate concentration (µmol/kg); |
| nitrit* | - | is the nitrite concentration (µmol/kg); |
| phspht* | - | is the phosphate concentration (µmol/kg); |
| cfc11* | - | is the trichlorofluoromethane-11 concentration (CC3F) (pmol/kg); |
| cfc12* | - | is the dichlorodifluoromethane-12 concentration (CC3F2) (pmol/kg); |
| tcarb* | - | is the total carbon dioxide concentration (µmol/kg); |
| talk* | - | is the total alkalinity concentration (µmol/kg); |
| qualt | - | is a 13-digit character variable that contains data quality flag codes for parameters flagged by an asterisk (*) in the output file. |
Quality flag definitions:
| 1 | = | Sample for this measurement was drawn from water bottle but analysis was not received; |
| 2 | = | Acceptable measurement; |
| 3 | = | Questionable measurement; |
| 4 | = | Bad measurement; |
| 5 | = | Not reported; |
| 6 | = | Mean of replicate measurements; |
| 7 | = | Manual chromatographic peak measurement; |
| 8 | = | Irregular digital chromatographic peak integration; |
| 9 | = | Sample not drawn for this measurement from this bottle. |
