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.