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)

 

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.