Dissolved neodymium concentrations and neodymium isotope compositions for deep water (≥1500 m) samples of R/V SONNE cruise SO245-UltraPac in the South Pacific

• Main Authors: Waltemathe, Henning, Struve, Torben, Rehbein, Matthias, Pahnke, Katharina
• Format: Dataset
• Language: English
• Published: PANGAEA
• Subjects: Bottle number; Calculated; Cruise/expedition; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH; water; Dissolved neodymium concentrations; Dissolved neodymium isotope composition; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Hydrothermal influence; Identification; Inductively coupled plasma mass spectrometer (ICP-MS); Thermo Finnigan; Element 2; coupled with Desolvation introduction system; Teledyne CETAC Technologies; Aridus 2; ThermoFisher Scientific; Neptune Plus; LATITUDE; LONGITUDE; Neodymium; dissolved; uncertainty; Neodymium-143/Neodymium-144 ratio; standard error; Propagated uncertainty; Radiogenic isotopes; Relative standard deviation; RSD%; Sample ID; SO245; SO245_10-1; SO245_12-2; SO245_14-2; SO245_15-13; SO245_2-2; SO245_4-1; SO245_6-1; SO245_8-1; Sonne_2; South Pacific; Southern Ocean; Pacific; New Zealand
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.968708

This dataset includes seawater neodymium (Nd) concentrations and Nd isotope signatures (expressed as ε-Nd) obtained from a zonal deep-water (1500 – 5321 m water depth) transect across the oligotrophic South Pacific gyre (transect between Antofagasta, Chile, and Wellington, New Zealand). The samples were collected during cruise SO245 with R/V Sonne as part of the GEOTRACES process study GPpr09. Across 8 stations, dissolved Nd ranges from 10.76 to 31.1 pmol/kg with an overall increase with water depth, but slightly lower concentrations in the deep southeast Pacific compared to the southwest Pacific. The isotope composition shows ε-Nd values ranging from -3.9 to -8.5 with lowest ε-Nd (ε-Nd = -7.5 to -8.5) in the deep Pacific west of the EPR and more radiogenic ε-Nd values (ε-Nd = -4 to -6) east of the EPR. The ε-Nd values can be largely explained by the mixing of deep water masses from the Southern Ocean and the North Pacific, whereas Nd show the influence of non-conservative processes expressed in a distinct mid-depth depletion across the transect.