tun2.dat (File 5)
This file provides hydrographic, carbon dioxide, and chemical data for the 97 stations occupied during the R/V Thomas Washington TUNES-2 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, and TCO2; TALK; pCO2; pCO2 temperature; and data quality flags. The file is sorted by station number and pressure and may be read by using the following FORTRAN 77 code [contained in tun2dat.for (File 3)]:
CHARACTER qualt*14
INTEGER sta, cast, samp, bot
REAL pre, ctdtmp, ctdsal, ctdoxy, theta, sal, oxy, silca
REAL nitrat, nitrit, phspht, cfc11, cfc12, tcarb, talk
REAL pco2, pco2tmp
read (1, 10, end=999) sta, cast, samp, bot, pre, ctdtmp,
1 ctdsal, ctdoxy, theta, sal, oxy, silca, nitrat, nitrit,
2 phspht, cfc11, cfc12, tcarb, talk, pco2, pco2tmp, qualt
10 format (5X, I3, 7X, I1, 6X, I2, 5X, I3, 1X, F7.1, 1X, F7.4,
1 1X, F7.4, 1X, F7.1, 1X, F7.4, 1X, F9.4, 1X, F7.1, 1X, F7.2,
2 1X, F7.2, 1X, F7.2, 1X, F7.2, 1X, F8.3, 1X, F8.3, 1X, F7.1,
3 1X, F7.1, 1X, F7.2, 1X, F7.2, 1X, A14)
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 | 3 | 30 | 32 |
| pre | Numeric | 7 | 35 | 40 |
| ctdtmp | Numeric | 7 | 42 | 48 |
| ctdsal | Numeric | 7 | 50 | 56 |
| ctdoxy | Numeric | 7 | 58 | 64 |
| theta | Numeric | 7 | 66 | 72 |
| sal | Numeric | 9 | 74 | 82 |
| oxy | Numeric | 7 | 84 | 90 |
| silca | Numeric | 7 | 92 | 98 |
| nitrat | Numeric | 7 | 100 | 106 |
| nitrit | Numeric | 7 | 108 | 114 |
| phspht | Numeric | 7 | 116 | 122 |
| cfc11 | Numeric | 8 | 124 | 131 |
| cfc12 | Numeric | 8 | 133 | 140 |
| tcarb | Numeric | 7 | 142 | 148 |
| talk | Numeric | 7 | 150 | 156 |
| pco2 | Numeric | 7 | 158 | 164 |
| pco2tmp | Numeric | 7 | 166 | 172 |
| qualt | Character | 14 | 174 | 187 |
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 (oC); |
| ctdsal* | - | is the CTD salinity [on the Practical Salinity Scale (PSS)]; |
| ctdoxy | - | is the CTD oxygen concentration (µ mol/kg); |
| theta | - | is the potential temperature (oC); |
| sal* | - | is the bottle salinity; |
| xy* | - | is the oxygen concentration (µ mol/kg); |
| silca* | - | is the silicate concentration (µ mol/kg); |
| nitrat* | - | is the nitrate concentration (µ mol/kg); |
| nitrit* | - | is the nitrite concentration (µ mol/kg); |
| phspht* | - | is the phosphate concentration (µ mol/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 (µ mol/kg); |
| talk* | - | is the total alkalinity concentration (µ mol/kg); |
| pco2* | - | is the partial pressure of CO2 (µ atm); |
| pco2tmp | - | is the temperature of equilibration of the pCO2 samples in the equilibrator (oC); |
| qualt | - | is a 14-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. |
