Dataset: SF6 and helium data from a tracer release experiment conducted June 2018 in the coastal Baltic Sea during FS Alkor cruise AL510

ValidatedFinal no updates expectedDOI: 10.26008/1912/bco-dmo.915772.1Version 1 (2024-01-10)Dataset Type:Cruise ResultsDataset Type:experimental

Principal Investigator: David T. Ho (University of Hawaiʻi at Mānoa)

Co-Principal Investigator: Peter Schlosser (Arizona State University)

Student: Ryo Dobashi (University of Hawaiʻi at Mānoa)

BCO-DMO Data Manager: Dana Stuart Gerlach (Woods Hole Oceanographic Institution)


Program: United States Surface Ocean Lower Atmosphere Study (U.S. SOLAS)

Program: Ocean Carbon and Biogeochemistry (OCB)

Project: Collaborative Research: Influence of Surfactants on Air-Sea Gas Exchange: 3He/SF6 Experiments in the Baltic Sea (Baltic GasEx)


Abstract

These data are 3He and SF6 from a tracer release experiment conducted in the coastal Baltic Sea. The experiment was conducted in June 2018 and the goal was to determine gas transfer velocities in the Baltic Sea, where it is thought that excess surfactants and limited wind fetch would affect the relationship between wind speed and gas transfer velocity.

A tracer release experiment was conducted in the coastal Baltic Sea during cruise AL510 aboard the research vessel FS Alkor. On June 4th, 2018, we injected 3He and SF6 into the surface ocean (~5 m depth). After the injection, near the center of the SF6 patch, depth profiles of temperature and salinity were measured using a conductivity, temperature, and depth (CTD) sonde and water samples were collected in Niskin bottles.

Discrete SF6 samples (and replicates) were drawn from the Niskin bottles using 550 ml glass bottles with ground-glass stoppers. For discrete 3He samples, ~40 milliliters of seawater were collected in copper tubes mounted in aluminum channels and sealed at the ends with stainless steel clamps.

SF6 samples were taken at the same stations and measured on board the FS Alkor. Concentration of SF6 was measured using a purge-and-trap SF6 analysis system designed following Law et al. (1994). In this system, SF6 was separated from other gases and measured with a gas chromatography electron capture detector (GC-ECD).

3He samples were measured at the Lamont-Doherty Earth Observatory (LDEO) Noble Gas Laboratory.  In the laboratory, 3He samples were extracted from the copper tubes using a vacuum extraction system (Ludin et al., 1998) and measured on a VG-5400 He isotope mass spectrometer. Precision is about 0.5 to 1% in δ3He for samples with high δ3He values (100% < δ3He < 1000%), and 0.2 to 0.5% for samples with lower δ3He values (-1.7% < δ3He < 100%). 


Related Datasets

IsRelatedTo

Dataset: Baltic GasEx (2018) Helium isotopes and Neon
Schlosser, P., Koffman, T. N. (2024) Helium isotope and neon data from seawater samples collected June 2018 during FS Alkor cruise AL510 in the Baltic Sea. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-12-05 doi:10.26008/1912/bco-dmo.915490.1

Related Publications

General

Weiss, R. F. (1971). Solubility of helium and neon in water and seawater. Journal of Chemical & Engineering Data, 16(2), 235–241. doi:10.1021/je60049a019
Methods

Benson, B. B., & Krause, D. (1980). Isotopic fractionation of helium during solution: A probe for the liquid state. Journal of Solution Chemistry, 9(12), 895–909. https://doi.org/10.1007/bf00646402
Methods

Clarke, W. B., Jenkins, W. J., & Top, Z. (1976). Determination of tritium by mass spectrometric measurement of 3He. The International Journal of Applied Radiation and Isotopes, 27(9), 515–522. https://doi.org/10.1016/0020-708x(76)90082-x
Methods

Ho, D. T., Schlosser, P., & Caplow, T. (2002). Determination of Longitudinal Dispersion Coefficient and Net Advection in the Tidal Hudson River with a Large-Scale, High Resolution SF6 Tracer Release Experiment. Environmental Science &amp; Technology, 36(15), 3234–3241. https://doi.org/10.1021/es015814+
Methods

Law, C. S., Watson, A. J., & Liddicoat, M. I. (1994). Automated vacuum analysis of sulphur hexafluoride in seawater: derivation of the atmospheric trend (1970–1993) and potential as a transient tracer. Marine Chemistry, 48(1), 57–69. https://doi.org/10.1016/0304-4203(94)90062-0