Consistency of TTO-NAS inorganic carbon data with modern measurements

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...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Tanhua, Toste, Wallace, Douglas W.R.
Format: Article in Journal/Newspaper
Language:English
Published: AGU (American Geophysical Union) 2005
Subjects:
North Atlantic
Online Access:https://oceanrep.geomar.de/id/eprint/2616/
https://oceanrep.geomar.de/id/eprint/2616/1/227_Wallace_2005_ConsistencyOfTtonasInorganicCarbon_Artzeit_pubid6339.pdf
https://doi.org/10.1029/2005GL023248
Description
Summary: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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