Citation:

PANGAEA.989250

Name: Dissolved neodymium concentrations and isotopic composition from the full water column in the South Pacific Ocean during SONNE cruise SO289 (GEOTRACES section GP21)
Published: 2026-01-16
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Nd concentration; Nd isotopic composition; ocean circulation; South Pacific Ocean

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Published: 2026-01-16 • DOI registered: 2026-02-14

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Abstract:

This dataset contains dissolved neodymium (Nd) concentrations and radiogenic Nd isotope compositions from full water-column seawater profiles collected in the South Pacific Ocean during the GEOTRACES section GP21 (Chile to New Caledonia) aboard R/V SONNE (cruise SO289) between 23 February and 4 April 2022.

Between 10 and 40 L of seawater were collected using 10 L Niskin bottles mounted on a stainless-steel CTD rosette. Beginning at Station 18, an additional 40 L of surface seawater was collected using a trace-metal-clean tow-fish to enable Nd isotope measurements at expected low concentrations.

Samples for Nd isotope analysis were pre-concentrated onboard by coprecipitation with Fe hydroxide and later purified in the home laboratory before analysis by MC-ICP-MS (Thermo Neptune Plus). Nd concentrations were determined from 1 L acidified seawater aliquots spiked with a ¹⁵⁰Nd spike, processed via Fe-hydroxide coprecipitation and AG 50W-X8 cation exchange purification, and measured by isotope-dilution MC-ICP-MS with external reproducibility better than 0.2%.

Keyword(s):

Nd concentration; Nd isotopic composition; ocean circulation; South Pacific Ocean

Supplement to:

Zhang, Zhouling; Xu, Antao; Chen, Xue-Gang; Hathorne, Edmund; Gutjahr, Marcus; Frank, Martin (2026): Conservative Behavior of Radiogenic Neodymium Isotopes in the South Pacific Interior. Earth and Planetary Science Letters, 678, https://doi.org/10.1016/j.epsl.2026.119850

Coverage:

Median Latitude: -29.481221 * Median Longitude: -131.586838 * South-bound Latitude: -33.607520 * West-bound Longitude: 172.045300 * North-bound Latitude: -25.718100 * East-bound Longitude: -71.728980

Date/Time Start: 2022-02-23T17:18:00 * Date/Time End: 2022-04-03T21:10:00

Minimum DEPTH, water: 5 m * Maximum DEPTH, water: 5984 m

Event(s):

SO289_0_Underway-3 * Latitude Start: -33.603980 * Longitude Start: -71.732800 * Latitude End: -25.832970 * Longitude End: 171.998950 * Date/Time Start: 2022-02-23T17:39:00 * Date/Time End: 2022-04-03T21:10:00 * Elevation Start: -112.5 m * Elevation End: -3391.7 m * Location: South Pacific Ocean * Campaign: (GEOTRACES GP21) * Basis: * Method/Device: Fish undulating, recording system tow (FISH) * Comment: Towed Trace Metal Clean Fish for trace metal analysis

SO289_1-2 * Latitude: -33.607520 * Longitude: -71.728980 * Date/Time: 2022-02-23T17:18:00 * Elevation: -109.4 m * Location: South Pacific Ocean * Campaign: (GEOTRACES GP21) * Basis: * Method/Device: (CTD-RO) * Comment: CTD-SS

SO289_2-2 * Latitude: -33.090230 * Longitude: -71.825300 * Date/Time: 2022-02-23T22:21:00 * Elevation: -163.2 m * Location: South Pacific Ocean * Campaign: (GEOTRACES GP21) * Basis: * Method/Device: (CTD-RO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Zhang, Zhouling
2	Date/Time of event	Date/Time		Zhang, Zhouling
3	Station label	Station		Zhang, Zhouling
4	LATITUDE	Latitude		Zhang, Zhouling		Geocode
5	LONGITUDE	Longitude		Zhang, Zhouling		Geocode
6	Depth, bathymetric	Bathy depth	m	Zhang, Zhouling
7	DEPTH, water	Depth water	m	Zhang, Zhouling	CTD	Geocode
8	Pressure, water	Press	dbar	Zhang, Zhouling	CTD
9	Temperature, water	Temp	°C	Zhang, Zhouling	CTD
10	Salinity	Sal		Zhang, Zhouling	CTD
11	Density, sigma, in situ	Sigma in situ	kg/m³	Zhang, Zhouling	CTD
12	Neutral density	gamma n	kg/m³	Zhang, Zhouling	CTD
13	Oxygen	O2	µmol/kg	Zhang, Zhouling	CTD
14	Neodymium, dissolved	Nd diss	pmol/kg	Zhang, Zhouling	CTD
15	ε-Neodymium	ε-Nd		Zhang, Zhouling
16	ε-Neodymium, standard error	ε-Nd std e	±	Zhang, Zhouling		2SD
17	ε-Neodymium, standard deviation	ε-Nd std dev	±	Zhang, Zhouling		2SD

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2596 data points

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