Table 4 - Comparison Between Hydrographic and Chemical Data Obtained at Pairs of Repeat Stations

The ± values in top two rows for each property indicate the observed precision of measurements at each station (expressed in terms of one standard deviation). The ± values in the third row indicate standard deviation for two stations together when two station data are indistinguishable, whereas those in the parentheses indicate the mean systematic difference between the two stations (the top station - the bottom station). The values in the MEAN column indicate the mean precision of the measurements for all stations. "J", "T" and "S" in front of the station numbers indicate respectively the JUNO, TUNES and S4P expeditions.

Crossover No.	#1	#2	#3	#4	#5	MEAN
Station. No.	J-3	J-119	J-80	J-206	J-229
Station. No.	T-180	T-179	J-128	J-256	S-703
Salinity	±0.001	±0.001	±0.001	±0.001	±0.001	±0.001
	±0.001	±0.001	±0.002	�0.001	±0.001
combined	±0.002	(+0.002)	±0.004	±0.002	(+0.003)
Oxygen	±0.2	±0.2	±1	±0.5	±0.2	±0.4
(�mol/kg)	±0.2	±0.2	±1	±0.5	±0.2
combined	±0.5	±1	±2	±1	(-2)
TCO2	±1	±1	±2	±1	±1.5	±1.6
(�mol/kg)	±1.5	±2	±2.5	±1.5	±1.5
combined	±2.0	(-4)	±2.5	(-2)	±2
PCO2	±2	±3	±2	±2	±2	±2.5
(�atm)	±2	±3	±3	±3	±2
combined	±4	±4	±3	(-7)	(±6)
Alkalinity	±1	±1	±2	±1.5	±1	±1.8
(�eq/kg)	±2	±3	±3	±2	±1.5
combined	±3	(-5)	±3	±2	±2
Silicate	±0.2	±0.2	±1	±0.5	±0.2	±0.4
(�mol/kg)	±0.2	±0.2	±1	±0.5	±0.2
combined	(-3)	(-1.5)	�1.5	±0.7	±0.2
Nitrate	±0.05	±0.07	±0.1	±0.05	±0.05	±0.06
(�mol/kg)	±0.05	±0.05	±0.1	±0.05	±0.05
combined	(+0.2)	(+0.2)	(+0.6)	(-0.3)	(+0.2)
Phosphate	±0.002	±0.005	±0.007	±0.006	±0.005	±0.006
(�mol/kg)	±0.002	±0.005	±0.02	±0.005	±0.005
combined	(+0.01)	(-0.03)	(-0.05)	�0.005	(+0.01)