The EPOCS 1988 cruise was a continuation of the RITS/CO2 1988 cruise. R/V Oceanographer sailed out of Samoa on 9 May (Day 130) north to the equator. It then continued east along the equator to 140° W and then north to Honolulu, Hawaii on 4 June (Day 156). The temperature, salinity, and oxygen data from CTD measurements made on this cruise are given in Mangum et al. (1993).
Atmospheric f(CO2) was lowest near Samoa (333 µatm) and increased to the north, reaching 345 µatm near 15° N. Surface seawater values were also lowest near Samoa, but increased toward the equator. Supersaturation persisted along equator (~430 µatm), but CO2 concentrations dropped to near-saturation north of 5° N and into Hawaii. The mean percent standard deviation of the standard gases on this leg was 0.21%.
Two values were anomalously high on this track. They are flagged in the data set.