P02

• Nitrate
• Phosphate
• Silicate
• Oxygen
• TCO₂ - Adjustment of -4 µmol/kg recommended.
• Crossovers:
  

  Crossing #	Latitude	Longitude	WOCE Line	Station(s) used	Crosses with	Station(s) used	Delta TCO2	Stdev TCO2
  10	30° N	148° E	P2	74,77	P10	37	2.8	1.0
  23	30° N	165° E	P2	54,55	P13	48	5.5	2.1
  28	30° N	178° E	P2	63	P14	58	-0.5	2.7
  36	30° N	165° W	P2	52,54	P15N	65	5.7	4.4
  49	30° N	152° W	P2	30,31,32	P16	70	7.6	3.0
  61	30° N	135° W	P2	26	P17	78	3.1	4.6
  MEAN							4.0	2.8

• Precision of Duplicate Measurements - No Information.
• CRM Results - No Information.
• Multiparameter Analysis (details) - Mean Difference (estimated - measured) = -4.3 ± 5.4
• Isopycnal Analysis - Results of our isopycnal analysis of P2 and P16N TCO₂ near 30° N, 152° W indicates consistently higher TCO₂ values (8-10 µmol/kg) in deep water on the P2 line as with P16N (Figure). The P14 data along 179W also show slightly higher deep water values (mean = 4 µmol/kg) than the P16N results. In the previous crossover and MLR analyses P14 showed no obvious offsets, whereas the P2 were generally found to be high and the P16N data were consistently low. The results of the isopycnal analysis can be reconciled with the findings of the other methods if the P16N data are increased by ~4 µmol/kg and the P2 data are decreased by 4-6 µmol/kg.
• Alkalinity- Adjustment of +14 µmol/kg recommended.
• Crossovers:
  

  Crossing #	Old #	Latitude	Longitude	Cruise 1	Cruise 1 Sta	Cruise 2	Cruise 2 Sta	TALK Delta Stdev
  10		30° N	148° E	P10	74,77	P2	37	16.9 ± 9.7 (graph)
  23		30° N	165° E	P13	54,55	P2	48	12.9 ± 1.2 (graph)
  28		30° N	178° E	P14N	63	P2	58	8.4 ± 2.4 (graph)
  36		30° N	165° W	P15N	52,54	P2	65	14.8 ± 6.7 (graph)
  49		30° N	152° W	P16N	30,31,32	P2	70	3.2 ± 0.2 (graph)
  AVERAGE								11.2 ± 5.5

• Precision of Duplicate Measurements - No Information.
• CRM Results - No Information.
• Multiparameter Analysis (details) - Mean Difference (estimated - measured) = 17.1 ± 4.2
• Isopycnal Analysis - An isopycnal analysis was used to evaluate the P2 data relative to the meridional cruises that it crosses. The P2 data were plotted as a function of longitude for three isopycnal intervals representing data between 3000 and 4000 m (Figure). Values from P10, P13N, P14N and P15N, with latitudes between 25 and 35° N, were consistently higher than the P2 data indicating that a significant positive correction is necessary for this cruise.
• fCO₂ (Not Measured)
• pH - No adjustment recommended.
• Crossovers - No Information.
• CRM Results - No Information.