Dataset: Barium concentration and isotopic data collected along the California Coastline during July 2014 from R/V Melville cruise MV1405

ValidatedFinal no updates expectedDOI: 10.1575/1912/bco-dmo.770447.1Version 1 (2019-06-10)Dataset Type:Cruise Results

Principal Investigator: Tristan J. Horner (Woods Hole Oceanographic Institution)

BCO-DMO Data Manager: Shannon Rauch (Woods Hole Oceanographic Institution)


Project: U.S. GEOTRACES Pacific Meridional Transect: Tracing Basin-scale Nutrient Cycling and Carbon Export with Dissolved and Particulate Barium-isotopic Distributions (GEOTRACES PMT Barium)


Abstract

Barium concentration and isotopic data collected along the California Coastline during July 2014 from R/V Melville cruise MV1405.

Samples were collected using GO-FLO Teflon Trace Metal Bottles, filtered to 0.2 μm or 0.45 μm (depending on filter type), acidified to pH ≈ 2 with hydrochloric acid, and stored for several years prior to processing. Aliquots containing five milliliters of seawater were cleanly subsampled from each sample, weighed, and an appropriate quantity of 136Ba–135Ba double spike added. Following spike–sample equilibration, barium was co-precipitated with calcium carbonate via dropwise addition of sodium carbonate. The resultant precipitate was dissolved in hydrochloric acid and twice passed through cation-exchange columns to purify Ba from matrix elements.

Samples were aspirated, desolvated, and analyzed using a 100 μL/min nebulizer, Aridus II desolvation system, and ThermoFisher Neptune multi-collector ICP-MS, respectively. All instrumentation was sitated at the WHOI Plasma Facility. Barium-isotopic compositions were calculated from simultaneous monitoring of ion beams corresponding to m/z 131 (Xe, xenon), 135 (Ba), 136 (Xe; Ba; Ce, cerium), 137 (Ba), 138 (Ba; La, lanthanum; Ce), 139 (La) and 140 (Ce).

Problem Report:
Sample from 1,000 m (Event #42; St. 12b) has an asymmetric uncertainty due to possible evaporative losses; positive uncertainty is +1.4 nmol/kg, whereas negative uncertainty is −6.3 nmol/kg (both are one standard deviation).


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Geyman, B. M., Ptacek, J. L., LaVigne, M., & Horner, T. J. (2019). Barium in deep-sea bamboo corals: Phase associations, barium stable isotopes, & prospects for paleoceanography. Earth and Planetary Science Letters, 525, 115751. doi:10.1016/j.epsl.2019.115751
Related Research

Bates, S. L., Hendry, K. R., Pryer, H. V., Kinsley, C. W., Pyle, K. M., Woodward, E. M. S., & Horner, T. J. (2017). Barium isotopes reveal role of ocean circulation on barium cycling in the Atlantic. Geochimica et Cosmochimica Acta, 204, 286–299. doi:10.1016/j.gca.2017.01.043