Table 2. Analytical methods used to measure the carbon system parameters
No. | Cruise name | Period | Dissolved inorganic carbon | Total alkalinitya | CO2 fugacity | pH |
---|---|---|---|---|---|---|
1 | A21/A12 | 1/23/90-3/8/90 | Coulometer | Gas chromatographyb | ||
2 | A09 | 2/10/91-3/23/91 | SOMMAc | Fulld | ||
3 | A16S | 7/11/91-9/2/91 | SOMMA | Full | Infrared analysise | |
4 | A01E | 9/2/91-9/26/91 | SOMMA | Full | ||
5 | A12B | 5/21/92-8/5/92 | Coulometer | |||
6 | A05 | 7/15/92-7/23/92 | Calculated | 1-point | Electrode | |
7 | A10 | 12/27/92-1/31/93 | SOMMA | Full | ||
8 | A11 | 12/22/92-2/1/93 | ||||
9 | A07 | 1/2/93-1/10/93 | Gas chromatography | Gas chromatography | Electrode | |
10 | A06 | 1/2/93-3/19/93 | Gas chromatography | Gas chromatography | Electrode | |
11 | A16N | 7/4/93-8/30/93 | SOMMA | Full | Infrared analysise | Spectrophotometric |
12 | A17 | 1/4/94-3/22/94 | SOMMA | 1-point | Potentiometricf | |
13 | A15 | 4/3/94-5/21/94 | SOMMA | Full | ||
14 | A08 | 3/29/94-5/11/94 | SOMMA | Gas chromatographyg | ||
15 | A13 | 2/20/95-3/2/95 | SOMMA | 1-point | ||
16 | A14 | 1/12/95-2/16/95 | SOMMA | 1-point | Potentiometric | |
17 | A23 | 3/20/95-5/6/95 | Coulometer | Gas chromatographyh | ||
18 | A01W | 6/95-7/95 | Coulometer | Full | ||
19 | A12BR | 3/17/96-5/20/96 | Coulometer | |||
20 | A02 | 6/11/97-7/3/97 | SOMMA | Full | ||
21 | A20 | 7/17/97-8/10/97 | SOMMA | Full | Electrode | |
22 | A22 | 8/15/97-9/3/97 | SOMMA | Full | Electrode | |
23 | A24 | 8/15/97-9/3/97 | SOMMA | Full | Electrode | |
24 | A05R | 1/24/98-2/23/98 | SOMMA | Full | Gas chromatographyg | Spectrophotometric |
25 | A01WR | 6/22/98-7/8/98 | Coulometer | Full | Electrode |
aDetermined by potentiometric titration, either a full curve ("Full") or a single-point ("1-point") titration.
b500-mL samples, analysis by gas chromatography. (Chipman, D. W., J. Marra, and T. Takahashi. Primary production at 47° N and 20° W in the North Atlantic Ocean: A comparison between the 14C incubation method and mixed layer carbon budget observations. Deep-Sea Research II 40, 151-69, 1993.)
cSingle-operator multiparameter metabolic analyzer.
dAnalyzed shoreside.
e500-mL samples, infrared analysis. [Wanninkhof, R., and K. Thoning. Measurement of fugacity of CO2 in surface water using continuous and discrete sampling methods. Mar. Chem. 44 (2-4), 189-205, 1993.]
fA17C only.
g60- or 120-mL samples, analysis by gas chromatography. (Neill, C., K. M. Johnson, E. Lewis, and D. W. R. Wallace. Small volume, batch equilibration measurement of fCO2 in discrete water samples. Limnol. Oceanogr. 42, 1774-83, 1997.)
hMeasured at 4°C.