Data Report Tritium and Helium Isotopes: 2015 U.S. GEOTRACES Arctic Cruise GN01 (HLY1502) ...

• Main Authors: Schlosser, Peter, Koffman, Tobias, Newton, Robert, Pasqualini, Angelica
• Format: Dataset
• Language: English
• Published: Interdisciplinary Earth Data Alliance (IEDA) 2023
• Subjects: Regional Continents, Oceans; Arctic Ocean, GEOTRACES, Mass spectrometry, Tritium, Helium Isotopes, Neon Isotopes, Environmental Tracers, Geochemistry, Oceanography; Arctic; Arctic Ocean; Palisades
• Online Access: https://dx.doi.org/10.26022/ieda/112990; https://ecl.earthchem.org/view.php?id=2990

A total of 400 seawater samples from 31 hydrographic stations were collected aboard the U.S.C.G. Icebreaker HEALY between August 12, 2015, and October 7, 2015. He and Ne isotope measurements were conducted in the Noble Gas Laboratory of the Lamont-Doherty Earth Observatory on a dedicated, fully automated VG5400 mass spectrometer following the procedures described by Ludin et al., 1998. He and Ne samples were collected in copper tubes (40 ml) sealed by stainless steel pinch-off clamps. The seawater samples were first degassed in a vacuum extraction unit with an efficiency of ca. 99.9%. Gas extraction procedures are described in detail in Jenkins et al. (1991). Helium isotopes (3He and 4He) were measured using a dedicated He isotope mass spectrometer (MM5400). Air samples and blanks were used to calibrate and monitor the sensitivity changes of the instrument during operation. Measurement precision of He and Ne (units cm3 STP g-1) is ±1% of the measured values. Helium isotope ratios are reported as a δ3He or ... : 1. Ludin, A., R. Weppernig, G. Bönisch, and P. Schlosser (1998), Mass spectrometric measurement of helium isotopes and tritium in water samples, Tech. Rep. 98‐6, 42 pp., Lamont‐Doherty Earth Obs., Palisades, NY. 2. Jenkins, W. J., Lott, D. E., Davis, M.W., Birdwhistell, S. P., & Matthewson, M. O. (1991). Measuring Helium Isotopes and Tritium in Seawater Samples. WOCE Hydrographic Operations and Methods. 3. Clarke, W.B., Jenkins, W. J., & Top, Z. (1976) Determination of Tritium by mass spectrometric measurements of 3He. International Journal of Applied Radiation and Isotopes, 27, p. 515–22. ...