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Tanhua, Toste; Wallace, Douglas WR (2005): Hydrochemistry measured on water bottle samples during METEOR cruise M60/5. PANGAEA, https://doi.org/10.1594/PANGAEA.761653, Supplement to: Tanhua, T; Wallace, DWR (2005): Consistency of TTO-NAS inorganic carbon data with modern measurements. Geophysical Research Letters, 32, L14618, https://doi.org/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 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.
Coverage:
Median Latitude: 32.395065 * Median Longitude: -43.106870 * South-bound Latitude: 19.495000 * West-bound Longitude: -65.997000 * North-bound Latitude: 41.982000 * East-bound Longitude: -10.188000
Date/Time Start: 2004-03-11T00:00:00 * Date/Time End: 2004-04-13T06:52:00
Minimum DEPTH, water: 5.95 m * Maximum DEPTH, water: 5680.26 m
Event(s):
M60/5_156 (06MT60_5/156) * Latitude: 19.495000 * Longitude: -61.967000 * Date/Time: 2004-03-11T00:00:00 * Elevation: -5587.0 m * Location: North Atlantic sub-tropical gyre * Campaign: M60/5 (06MT60_5) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M60/5_157 (06MT60_5/157) * Latitude: 20.797000 * Longitude: -62.260000 * Date/Time: 2004-03-11T00:00:00 * Elevation: -5592.0 m * Location: North Atlantic sub-tropical gyre * Campaign: M60/5 (06MT60_5) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M60/5_158 (06MT60_5/158) * Latitude: 22.963000 * Longitude: -63.230000 * Date/Time: 2004-03-12T00:00:00 * Elevation: -5490.0 m * Location: North Atlantic sub-tropical gyre * Campaign: M60/5 (06MT60_5) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Pressure, waterPressdbarTanhua, Toste
8Temperature, waterTemp°CTanhua, Toste
9SalinitySalTanhua, Toste
10Density, mass densityDensitykg/m3Tanhua, Toste
11Freon-11 (trichorofluoromethane)CFC-11pmol/lTanhua, Toste
12Freon-12 (dichlorodifluoromethane)CFC-12pmol/lTanhua, Toste
13OxygenO2µmol/lTanhua, Toste
14SilicateSi(OH)4µmol/lTanhua, Toste
15Nitrate[NO3]-µmol/lTanhua, Toste
16Nitrite[NO2]-µmol/lTanhua, Toste
17Phosphate[PO4]3-µmol/lTanhua, Toste
18Carbon, inorganic, dissolvedDICµmol/lTanhua, TosteCoulometric titration (Knap et al., 1996, IOC Manuals and Guides 29, UNESCO)sample volume 21 ml
19Alkalinity, totalATmmol(eq)/lTanhua, TosteTitration potentiometricsample volume 93.4 ml
20TetrachloromethaneCCl4pmol/lTanhua, Toste
Size:
14852 data points

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