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Stichel, Torben; Frank, Martin; Rickli, Jörg Dominik; Haley, Brian A (2012): (Table 1) Dissolved Hafnium and Neodymium in the South Atlantic measured on water bottle samples during POLARSTERN cruise ANT-XXIV/3. PANGAEA, https://doi.org/10.1594/PANGAEA.773993, Supplement to: Stichel, T et al. (2012): The hafnium and neodymium isotope composition of seawater in the Atlantic sector of the Southern Ocean. Earth and Planetary Science Letters, 317-318, 282-294, https://doi.org/10.1016/j.epsl.2011.11.025

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Abstract:
We present the first combined dissolved hafnium (Hf) and neodymium (Nd) concentrations and isotope compositions of deep water masses from the Atlantic sector of the Southern Ocean. Eight full depth profiles were analyzed for Hf and twelve for Nd. Hafnium concentrations are generally depleted in the upper few hundred meters ranging between 0.2 pmol/kg and 0.4 pmol/kg and increase to relatively constant values of around 0.6 pmol/kg in the deeper water column. At the stations north of the Polar Front (PF), Nd concentrations increase linearly from about 10 pmol/kg at depths of ~ 200 m to up to 31 pmol/kg close to the bottom indicating particle scavenging and release. Within the Weddell Gyre (WG), however, Nd concentrations are essentially constant at 25 pmol/kg at depths greater than ~ 1000 m. The distributions of both elements show a positive correlation with dissolved silicon implying a close linkage to diatom biogeochemistry.
Hafnium essentially shows invariant isotope compositions with values averaging at epsilon-Hf = +4.6, whereas Nd isotopes mark distinct differences between water masses, such as modified North Atlantic Deep Water (NADW, epsilon-Nd = -11 to -10) and Antarctic Bottom Water (AABW, epsilon-Nd = -8.6 to -9.6), but also waters locally advected via the Agulhas Current can be identified by their unradiogenic Nd isotope compositions. Mixing calculations suggest that a small fraction of Nd is removed by particle scavenging during mixing of water masses north of the PF. Nevertheless, the Nd isotope composition has apparently not been significantly affected by uptake and release of Nd from particles, as indicated by mixing calculations. A mixing envelope of an approximated North Pacific and a North Atlantic end-member shows that Nd isotope and concentration patterns in the Lower Circumpolar Deep Water (LCDW) can be fully explained by ~ 30:70 percentage contributions of these respective end-members.
Related to:
Fahrbach, Eberhard; de Baar, Hein J W (2010): The Expedition of the Research Vessel Polarstern to the Antarctic in 2008 (ANT-XXIV/3). Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 606, 232 pp, https://doi.org/10.2312/BzPM_0606_2010
Coverage:
Median Latitude: -57.720357 * Median Longitude: -22.008571 * South-bound Latitude: -69.610000 * West-bound Longitude: -64.430000 * North-bound Latitude: -42.343000 * East-bound Longitude: 8.990000
Date/Time Start: 2008-02-13T00:00:00 * Date/Time End: 2008-04-12T00:00:00
Minimum DEPTH, water: 150 m * Maximum DEPTH, water: 4800 m
Event(s):
PS71/101 * Latitude: -42.343000 * Longitude: 8.990000 * Date/Time: 2008-02-13T00:00:00 * Elevation: -4670.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: Hydrographic station (HYD) * Comment: Composite station
PS71/102 * Latitude: -44.663000 * Longitude: 7.093000 * Date/Time: 2008-02-15T00:00:00 * Elevation: -4600.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: Hydrographic station (HYD) * Comment: Composite station
PS71/104 * Latitude: -47.663000 * Longitude: 4.270000 * Date/Time: 2008-02-17T00:00:00 * Elevation: -4550.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: Hydrographic station (HYD) * Comment: Composite station
Comment:
Errors are given as external errors.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Temperature, water, potentialTpot°CRohardt, GerdCalculated
8SalinitySalRohardt, GerdCTD, SEA-BIRD SBE 911plusPSU
9Neutral densitygamma nkg/m3Stichel, TorbenCalculated
10ε-Neodymiumε-NdStichel, Torbensee reference(s)
11ε-Neodymium, standard deviationε-Nd std dev±Stichel, Torbensee reference(s)2-sigma error
12Neodymium, dissolvedNd disspmol/kgStichel, Torbensee reference(s)
13ε-Hafniumε-HfStichel, Torbensee reference(s)# - Values with higher 176Yb contribution on 176Hf than 0.3% and therefore a manual correction was applied.
14ε-Hafnium, standard deviationε-Hf std dev±Stichel, Torbensee reference(s)2-sigma error
15Hafnium, dissolvedHf disspmol/kgStichel, Torbensee reference(s)
16SilicateSILCATµmol/kgvan Ooijen, Jan CFahrbach and de Baar (2010)
17CommentCommentStichel, TorbenWater mass (equivalent)
Size:
705 data points

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