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Ebser, Sven; Kersting, Arne; Stöven, Tim; Feng, Zhongyi; Ringena, Lisa; Schmidt, Maximilian; Tanhua, Toste; Aeschbach-Hertig, Werner; Oberthaler, Markus K (2018): Argon-39 data from water samples during METEOR cruise M116/1. PANGAEA,, Supplement to: Ebser, S et al. (2018): 39Ar dating with small samples provides new key constraints on ocean ventilation. Nature Communications, 9(1),

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Ocean ventilation is the integrated effect of various processes that exchange surface properties with the ocean interior and is essential for oxygen supply, storage of anthropogenic carbon and the heat budget of the ocean, for instance. Current observational methods utilise transient tracers, e.g. tritium, SF6, CFCs and 14C. However, their dating ranges are not ideal to resolve the centennial-dynamics of the deep ocean, a gap filled by the noble gas isotope 39Ar with a half-life of 269 years. Its broad application has been hindered by its very low abundance, requiring 1000 L of water for dating. Here we show successful 39Ar dating with 5 L of water based on the atom-optical technique Atom Trap Trace Analysis. Our data reveal previously not quantifiable ventilation patterns in the Tropical Atlantic, where we find that advection is more important for the ventilation of the intermediate depth range than previously assumed. Now, the demonstrated analytical capabilities allow for a global collection of 39Ar data, which will have significant impact on our ability to quantify ocean ventilation.
Related to:
Tanhua, Toste (2018): Hydrochemistry of water samples during METEOR cruise M116/1. PANGAEA,
German Science Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Median Latitude: 57.350000 * Median Longitude: -22.966000 * South-bound Latitude: 44.000000 * West-bound Longitude: -24.280000 * North-bound Latitude: 82.000000 * East-bound Longitude: -22.000000
Date/Time Start: 2015-05-21T15:05:00 * Date/Time End: 2015-06-02T06:06:00
Minimum DEPTH, water: 11.25 m * Maximum DEPTH, water: 17.58 m
M116/1_517-1 (CTD 44) * Latitude: 11.548830 * Longitude: -22.992170 * Date/Time: 2015-05-21T15:05:00 * Elevation: -4783.0 m * Campaign: M116/1 (OSTRE_IV) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: Argon sample
M116/1_528-1 (CTD 55) * Latitude: 11.249500 * Longitude: -22.000330 * Date/Time: 2015-05-24T14:05:00 * Elevation: -5089.0 m * Campaign: M116/1 (OSTRE_IV) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: Argon sample
M116/1_555-1 (CTD 82) * Latitude: 17.582830 * Longitude: -24.283670 * Date/Time: 2015-06-02T06:06:00 * Elevation: -3604.0 m * Campaign: M116/1 (OSTRE_IV) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: Argon sample
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventTanhua, Toste
2Sample code/labelSample labelTanhua, Toste
3LONGITUDELongitudeTanhua, TosteGeocode
4LATITUDELatitudeTanhua, TosteGeocode
5DEPTH, waterDepth watermTanhua, TosteGeocode
6Pressure, waterPressdbarTanhua, Toste
7SalinitySalTanhua, TostePSS-78
8Temperature, waterTemp°CTanhua, Toste
9Argon-3939Ar10-15 molTanhua, Toste
10Argon-3939Ar10-15 molTanhua, Tostelower limit
11Argon-3939Ar10-15 molTanhua, Tosteupper limit
140 data points

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