CGC91/1
- Nitrate (SIO)
- Phosphate (SIO)
- Silicate (SIO)
- Oxygen (SIO)
- No adjustment recommended.
- Crossovers:
| Crossing # |
Old # |
Latitude |
Longitude |
Cruise 1 |
Cruise 1 Sta |
Cruise 2 |
Cruise 2 Sta |
Delta |
Stdev |
| 59 |
28 |
40N |
135W |
CGC91 |
10 |
P17N |
37,38,45 |
-7.9 |
1.5 |
| 60a |
55b |
35N |
135W |
CGC91 |
12 |
P17N |
28 |
-3.7 |
5.1 |
| 60b |
56 |
35N |
135W |
CGC91 |
12 |
P17C |
17 |
5.7 |
3.7 |
| |
MEAN |
-2.0 |
7.0 |
- Precision of Duplicate Measurements - No Information.
- CRM Results - CRM batch was bad. Precision 1.2-3 µmol/kg. Data were corrected for by 3 µmol/kg.
- Keeling Replicates- Not Available.
- Multiparameter Analysis (details) - Mean Difference (estimated - measured) = 4.3±3.6
- Isopycnal Analysis -
In the region near 37°N, 135°W, the isopycnal analysis indicated that the P17N data are
consistently higher (range: 6-16 µmol/kg) than the P17C and CGC91 data (Figure). The CGC91 data agree reasonably well with the P17C results at higher densities, but are somewhat higher at the lowest densities. The crossover and MLR analyses of P17N indicate that the P17N data need to be decreased by 3-10 µmol/kg. An average decrease of ~6 µmol/kg in P17N will account for most of the observed differences with P17C and CGC91, but not all of the observed 6-16 µmol/kg range.
The MLR techniques suggest that CGC91 should be increased by 4-5 µmol/kg, but the crossover results are much smaller and none of the techniques indicate a large correction is necessary for P17C. All of these results cannot be reconciled, but a small increase of ~2 µmol/kg in both CGC91 and P17C would minimize all of the observed offsets from the various approaches.
- Alkalinity (Not Measured)
- fCO2 (Not measured)
- pH(Byrne - USF) - We recommend adjusting all spectrophotometric pH values upward by 0.0047 to be internally consistent with the other carbon parameters.
- Crossovers - No Information.
- Precision of Duplicate Measurements - No Information.
- CRM Results - No Information.
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