Hydrochemistry measured on water bottle samples during METEOR cruise M60/5, supplement to: Tanhua, Toste; Wallace, Douglas WR (2005): Consistency of TTO-NAS inorganic carbon data with modern measurements. Geophysical Research Letters, 32, L14618

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
Main Authors: Tanhua, Toste, Wallace, Douglas WR
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2005
Subjects:
Event label
Date/Time of event
Latitude of event
Longitude of event
Elevation of event
DEPTH, water
Pressure, water
Temperature, water
Salinity
Density, mass density
Freon-11 trichorofluoromethane
Freon-12 dichlorodifluoromethane
Oxygen
Silicate
Nitrate
Nitrite
Phosphate
Carbon, inorganic, dissolved
Alkalinity, total
Tetrachloromethane
CTD/Rosette
Coulometric titration Knap et al., 1996, IOC Manuals and Guides 29, UNESCO
Titration potentiometric
M60/5
Meteor 1986
Surface Ocean Processes in the Anthropocene SOPRAN
Tanhua
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.761653
https://doi.pangaea.de/10.1594/PANGAEA.761653
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 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 higher than those reported in the revised TTO data set. This difference is reduced to 0.7 µmol/kg when our suggested correction to the TTO-NAS alkalinity is applied. These re-calculated DIC values are 2.4 µmol/kg 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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