P19C

• Nitrate (SIO)
• Phosphate (SIO)
• Silicate (SIO)
• Oxygen (SIO)
• TCO₂(Takahashi - LDEO) - No adjustments recommended.
• Crossovers:
  

  Crossing #	Old #	Latitude	Longitude	Cruise 1	Cruise 1 Sta	Cruise 2	Cruise 2 Sta	Delta	Stdev
  80	40	16° S	86° W	P19	333	P21	49	-3.1	0.9
  81	38	32° S	88° W	P19	299	P6	32,34,36	-0.5	0.1
  82	39	53° S	88° W	P19	256	P17E19S	206	1.8	0.9
  MEAN								-0.6	2.5

• Precision of Duplicate Measurements - Repeated measurements yielded a precision of ± 0.03%.
• CRM Results - Shipboard measurements off by -0.2 ± 2.1. Reported data not adjusted for offset.
• Keeling Replicates - Mean difference for 15 samples was -1.03 ± 1.85.
• Multiparameter Analysis (details) - Mean Difference (estimated - measured) = -3.1 ± 3.4
• Alkalinity (Not Measured)
• fCO₂(Takahashi - LDEO) - No adjustments recommended.
• Crossovers:
  

  Crossover	Longitude	Latitude	Cruise-1	Stations-1	Cruise-2	Stations-2	Δ Salinity	Δ O2	ΔfCO2	Feely et al. #
  82	86° W	55° S	P19C	256	P17E19S	206	-0.001 ± 0.001	0.4 ± 0.2	14.2 ± 4.3	39
  N/A	86° W	13° S	P19C	342	EQF92	88,89	0.012 ± 0.008	0.1 ± 3.8	18.8 ± 47.2	41

  From Feely et al., 1999, ORNL/CDIAC-115 (Δ = Cruise 1 - Cruise 2)
• Precision of Duplicate Measurements - Repeated measurements yielded a precision of ± 0.12%.
• CRM Results - No Information.
• pH (Not Measured)