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Dausmann, Veit; Frank, Martin; Zieringer, Moritz (2019): Dissolved Hafnium and Neodymium data measured on water samples during METEOR cruise M84/5 in the Bay of Biscay. PANGAEA, https://doi.org/10.1594/PANGAEA.902808, Supplement to: Dausmann, V et al. (2020): Water mass mixing versus local weathering inputs along the Bay of Biscay: Evidence from dissolved hafnium and neodymium isotopes. Marine Chemistry, 224, 103844, https://doi.org/10.1016/j.marchem.2020.103844

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Abstract:
We present dissolved neodymium and hafnium concentrations and radiogenic isotope compositions of surface and deep-water masses from the Bay of Biscay. Neodymium isotope signatures in surface waters of the Bay of Biscay are dominated by local weathering inputs from the surrounding continental margin. Subsurface Eastern North Atlantic Central Water (ENACW) shows a distinct Nd isotope signature (εNd≅‑12.0) at the southwestern-most station and is significantly diluted by mixing with more radiogenic waters on its way north along the European margin. Furthermore, the Nd isotope data clearly show a declining fraction of Mediterranean Outflow Water (MOW) at intermediate depths on its way north indicating that only 40% to 60% of MOW still present in the mixture at the Galician margin arrive at the stations further north in the Bay of Biscay. A potentially seasonal variability of the flow path of MOW is identified when comparing the results of the Nd isotope compositions and salinity data of this study with those of earlier studies from the area.
In agreement with Nd isotope and concentration analyses Hf isotope composition of MOW is affected by large-scale inputs of terrigenous material into the Mediterranean as can be deduced from elevated Hf concentrations at the Galician margin. Hf isotope signatures of all water masses of the Bay of Biscay, moreover, are overprinted by local weathering inputs and do not reflect water mass mixing. However, combined dissolved Nd and Hf isotopes serve as a useful indicator of local weathering influences on signatures expected from long distance admixture.
Coverage:
Median Latitude: 44.232651 * Median Longitude: -5.479520 * South-bound Latitude: 42.991550 * West-bound Longitude: -9.718670 * North-bound Latitude: 46.232500 * East-bound Longitude: -2.616500
Date/Time Start: 2011-06-02T00:00:00 * Date/Time End: 2011-06-17T00:00:00
Minimum DEPTH, water: m * Maximum DEPTH, water: 3250 m
Event(s):
M84/5_559 * Latitude: 43.005000 * Longitude: -9.718670 * Date/Time: 2011-06-02T06:22:00 * Elevation: -2344.0 m * Location: North Atlantic Ocean * Campaign: M84/5 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M84/5_560 * Latitude: 43.005000 * Longitude: -9.718330 * Date/Time: 2011-06-02T09:27:00 * Elevation: -2350.0 m * Location: North Atlantic Ocean * Campaign: M84/5 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M84/5_576 * Latitude: 44.132170 * Longitude: -6.001500 * Date/Time: 2011-06-05T01:01:00 * Elevation: -3295.0 m * Location: Bay of Biscay * Campaign: M84/5 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventDausmann, Veit
2Date/Time of eventDate/TimeDausmann, Veit
3Latitude of eventLatitudeDausmann, Veit
4Longitude of eventLongitudeDausmann, Veit
5Elevation of eventElevationmDausmann, Veit
6Area/localityAreaDausmann, Veit
7DEPTH, waterDepth watermDausmann, VeitGeocode
8VolumeVollDausmann, Veit
9Hafnium 176/Hafnium 177176Hf/177HfDausmann, Veit
10Hafnium 176/Hafnium 177, standard deviation176Hf/177Hf std dev±Dausmann, Veit
11ε-Hafniumε-HfDausmann, Veit
12ε-Hafnium, standard deviationε-Hf std dev±Dausmann, Veit
13ε-Neodymiumε-NdDausmann, Veit
14ε-Neodymium, standard deviationε-Nd std dev±Dausmann, Veit
15Hafnium, dissolvedHf disspmol/kgDausmann, Veit
16Neodymium, dissolvedNd disspmol/kgDausmann, Veit
17Temperature, waterTemp°CDausmann, Veit
18SalinitySalDausmann, Veit
Size:
452 data points

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