Waltemathe, Henning; Struve, Torben; Rehbein, Matthias; Pahnke, Katharina: Dissolved neodymium concentrations and neodymium isotope compositions for deep water (≥1500 m) samples of R/V SONNE cruise SO245-UltraPac in the South Pacific [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.968708 (dataset in review)
Abstract:
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. The samples were collected during cruise SO245 with R/V Sonne as part of the GEOTRACES process study GPpr09 from February 17th 2015, to January 28th 2016. The samples were processed and analysed following the GEOTRACES protocols. 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 -8.5 to -3.9 with lowest ε-Nd (ε-Nd = -8.5 to -7.5) in the deep Pacific west of the East Pacific Rise (EPR) and more radiogenic εNd values (εNd = -6 to -4) east of the EPR.
Keyword(s):
Supplement to:
Waltemathe, Henning; Struve, Torben; Rehbein, Matthias; Pahnke, Katharina (accepted): Influence of water mass mixing and hydrothermal processes on the distribution of dissolved Nd isotopes and concentrations in the South Pacific. Earth and Planetary Science Letters
Related to:
Ferdelman, Timothy G (2016): RV SONNE SO245 Cruise Report / Fahrtbericht, Antofagasta, Chile: 17. December 2015, Wellington, New Zealand: 28. January 2016, SO245 - UltraPac: Process oriented biogeochemical, microbiological and ecological investigations of the ultraoligotrophic South Pacific Gyre. Max-Planck-Institut für marine Mikrobiologie, Bremen, 104 pp, https://doi.org/10.2312/cr_so245
References:
Jacobsen, Stein B; Wasserburg, Gerald J (1980): Sm-Nd isotopic evolution of chondrites. Earth and Planetary Science Letters, 50(1), 139-155, https://doi.org/10.1016/0012-821X(80)90125-9
Pahnke, Katharina; van de Flierdt, Tina; Jones, Kevin M; Lambelet, Myriam; Hemming, Sidney R; Goldstein, Steven L (2012): GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 2: Systematic tests and baseline profiles. Limnology and Oceanography-Methods, 10(4), 252-269, https://doi.org/10.4319/lom.2012.10.252
Tanaka, Tsuyoshi; Togashi, Shigeko; Kamioka, Hikari; Amakawa, Hiroshi; Kagami, Hiroo; Hamamoto, Takuji; Yuhara, Masaki; Orihashi, Yuji; Yoneda, Shigekazu; Shimizu, Hiroshi; Kunimaru, Takanori; Takahashi, Kazuya; Yanagi, Takeru; Nakano, Takanori; Fujimaki, Hirokazu; Shinjo, Ryuichi; Asahara, Yoshihiro; Tanimizu, Masaharu; Dragusanu, Cristian (2000): JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium. Chemical Geology, 168(3-4), 279-281, https://doi.org/10.1016/S0009-2541(00)00198-4
Project(s):
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03G0245A: UltraPac Expedition SO245
German Research Foundation (DFG), grant/award no. 243019516: Distribution of neodymium isotopes and trace elements in the West Pacific: sources, sinks, and water mass signatures
Coverage:
Median Latitude: -31.275827 * Median Longitude: -153.287987 * South-bound Latitude: -39.999900 * West-bound Longitude: 117.618800 * North-bound Latitude: -23.491700 * East-bound Longitude: -90.029400
Date/Time Start: 2015-12-27T10:49:00 * Date/Time End: 2016-01-24T09:00:00
Minimum DEPTH, water: 1498 m * Maximum DEPTH, water: 5231 m
Event(s):
SO245_2-2 * Latitude: -23.491900 * Longitude: -90.029850 * Date/Time: 2015-12-27T07:25:00 * Elevation: -3890.9 m * Location: South Pacific Ocean * Campaign: SO245 (UltraPac, GEOTRACES) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO245_4-1 * Latitude: -23.500120 * Longitude: -100.000080 * Date/Time: 2015-12-30T19:03:00 * Elevation: -3879.8 m * Location: South Pacific Ocean * Campaign: SO245 (UltraPac, GEOTRACES) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO245_6-1 * Latitude: -23.500100 * Longitude: -110.049470 * Date/Time: 2016-01-03T09:21:00 * Elevation: -3612.8 m * Location: South Pacific Ocean * Campaign: SO245 (UltraPac, GEOTRACES) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Cruise/expedition | Expedition | ||||
| 3 | Station label | Station | ||||
| 4 | Identification | ID | Station | |||
| 5 | Bottle number | Bottle | # | |||
| 6 | Sample ID | Sample ID | ||||
| 7 | DATE/TIME | Date/Time | Geocode – CTD back on deck | |||
| 8 | LATITUDE | Latitude | Geocode | |||
| 9 | LONGITUDE | Longitude | Geocode | |||
| 10 | DEPTH, water | Depth water | m | Geocode | ||
| 11 | Neodymium, dissolved | Nd diss | pmol/kg | Pahnke, Katharina | Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Finnigan, Element 2; coupled with Desolvation introduction system, Teledyne CETAC Technologies, Aridus 2 | |
| 12 | Neodymium, dissolved, uncertainty | Nd diss unc | ± | Pahnke, Katharina | Relative standard deviation according to Pahnke et al. (2012) (RSD%) | 1 RSD % calculated from repeatedly processed and analysed GEOTRACES seawater standard SAFe (3000 m, Pahnke et al. (2012)) |
| 13 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Waltemathe, Henning | Normalised (Tanaka et al. 2000) | normalised to the accepted value of 0.512115 from Tanaka et al., 2000 | |
| 14 | Neodymium-143/Neodymium-144 ratio, standard error | 143Nd/144Nd std e | ± | Waltemathe, Henning | Calculated, 2 standard error (2SE) | internal 2SE error |
| 15 | ε-Neodymium | ε-Nd | Waltemathe, Henning | Multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS), ThermoFisher Scientific, Neptune Plus; coupled with Desolvation introduction system, Teledyne CETAC Technologies, Aridus 2 | calculated relative to the Chondritic Uniform Reservoir (CHUR) value of 143Nd/144Nd=0.512638 (Jacobsen and Wasserburg, 1980) | |
| 16 | ε-Neodymium, standard deviation | ε-Nd std dev | ± | Waltemathe, Henning | Calculated, 2 standard deviation (2SD) | external uncertainty (2SD) derived from repeated measurements of USGS rock reference material BCR-2 (Columbia River Basalt 2) |
| 17 | ε-Neodymium, error | ε-Nd e | ± | Waltemathe, Henning | Calculated, 2 sigma | propagated error calculated from the internal 2SE error and external 2SD error |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
670 data points