Tanhua, Toste and Wallace, Douglas W.R. (2005) Consistency of TTO-NAS inorganic carbon data with modern measurements. Geophysical Research Letters, 32 . L14618. DOI 10.1029/2005GL023248.

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Abstract

We compare alkalinity and total dissolved inorganic carbon (DIC) measurements made during the Transient Tracers in the Ocean, North Atlantic Study (TTO‐NAS) in 1981 with modern measurements from a TTO reoccupation cruise in 2004 (M60/5). We find that the TTO‐NAS alkalinity values are 3.6 ± 2.3 μmol kg−1 higher than modern alkalinity data tied to Certified Reference Materials. The TTO‐NAS DIC values re‐calculated from original alkalinity and discrete‐pCO2 data using currently accepted constants are 3.8 μmol kg−1 higher than those reported in the revised TTO data set. This difference is reduced to 0.7 μmol kg−1 when our suggested correction to the TTO‐NAS alkalinity is applied. These re‐calculated DIC values are 2.4 μmol kg−1 too low relative to contemporaneous measurements made by the vacuum extraction/manometric Certified method. Application of this correction brings the TTO data into almost perfect agreement with modern measurements for slowly‐ventilated deep water of the eastern Atlantic.

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