Dissolved radiogenic neodymium, stable oxygen isotopes and rare earth element concentrations of sea ice and snow samples collected during MOSAiC leg 3


Ten sea ice cores were drilled close to each other with a Kovacs 9 cm diameter corer (Kovacs Enterprise, Roseburg, USA) on April 8, 2020, near the main sampling site (MCS) for FYI and SYI during leg 3 of MOSAiC (station PS122/3_35-80). The ice cores were immediately transferred into plastic bags and stored at −20 °C together with a snow sample, which was collected before core extraction. In the home laboratory, the ice cores were rinsed with deionized water and the wet top surface was scraped off before the cores were sectioned into 10 cm pieces and the resulting intervals of the corresponding ice core depths were combined. Samples from one sea-ice core were not merged with the samples from the other nine ice cores to investigate the effects of sample pooling and possible related sources of bias. After melting, the meltwater was filtered through 0.45 µm Merck Millipore® cellulose acetate filters. Following homogenization and sub-sampling for salinity and δ18O analysis, the filtered samples were acidified to pH ≈ 2.2 with ultra-pure concentrated hydrochloric acid. Another aliquot was separated for REE and Nd concentration analyses. The snow sample was treated similarly, excluding the deionized water rinse and sectioning steps. The neodymium isotopes are reported as 143Nd/144Nd and as εNd and were determined at GEOMAR using an multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS). Their internal and external reproducibility is given in the data table. After pooling, the sea ice samples still had concentrations too low for εNd analysis, so two or three ice core intervals had to be combined to allow determination of εNd with relatively small uncertainties. The repeatedly reported εNd values for individual ice core samples are therefore the same measurement, not the same εNd values measured twice. Rare earth element concentrations are given in pmol/kg and were pre-concentrated offline using a SeaFAST system and determined using an inductively coupled plasma mass spectrometer (ICP-MS) at GEOMAR. Their external reproducibility is better than ~11% for La, Ce, Pr, Nd, Sm and Eu, better than ~13% for Gd, Tb and Dy and better than ~30% for Ho, Er, Tm, Yb and Lu. Stable oxygen isotopes were determined at the Stable Isotope Laboratory of the College of Earth, Ocean, and Atmospheric Sciences at Oregon State University using the CO2-water isotope equilibration technique and are reported as the measured 18O/16O ratio normalized to Vienna Standard Mean Ocean Water (V-SMOV) in δ-notation, with an external reproducibility of ± 0.05 ‰ or better.

DOI https://doi.pangaea.de/10.1594/PANGAEA.966225
Related Identifier References https://doi.org/10.1594/PANGAEA.948511
Related Identifier References https://doi.org/10.1594/PANGAEA.958466
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.966225
Creator Laukert, Georgi (ORCID: 0000-0002-8209-763X); Damm, Ellen ORCID logo; Simões Pereira, Patric; Bauch, Dorothea ORCID logo; Hathorne, Ed C ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.13039/501100003207 Crossref Funder ID AFMOSAiC-1_00 Multidisciplinary drifting Observatory for the Study of Arctic Climate; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.13039/501100003207 Crossref Funder ID AWI_PS122_00 Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Resource Type Dataset
Format text/tab-separated-values
Size 539 data points
Discipline Earth System Research
Spatial Coverage (14.631 LON, 84.466 LAT); Arctic Ocean