Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice

Obbard, Rachel W.; Lieb-Lappen, Ross M.; Nordick, Katherine V.; Golden, Ellyn J.; Leonard, Jeremiah R.; Lanzirotti, Antonio; Newville, Mathew G.

doi:10.1002/2016EA000172

Title: Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice

Journal Article · Sun Oct 23 00:00:00 EDT 2016 · Earth and Space Science

DOI:https://doi.org/10.1002/2016EA000172· OSTI ID:1424016

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^[2]; Lanzirotti, Antonio ^[3];

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Dartmouth College, Hanover, NH (United States). Thayer School of Engineering
Worcester Polytechnic Inst., MA (United States)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources

We describe the use of synchrotron-based X-ray fluorescence spectroscopy to examine the microstructural location of specific elements, primarily salts, in sea ice. This work was part of an investigation of the location of bromine in the sea ice-snowpack-blowing snow system, where it plays a part in the heterogeneous chemistry that contributes to tropospheric ozone depletion episodes. We analyzed samples at beamline 13-ID-E of the Advanced Photon Source at Argonne National Laboratory. Using an 18 keV incident energy beam, we produced elemental maps of salts for sea ice samples from the Ross Sea, Antarctica. The distribution of salts in sea ice depends on ice type. In our columnar ice samples, Br was located in parallel lines spaced roughly 0.5 mm apart, corresponding to the spacing of lamellae in the skeletal region during initial ice growth. The maps revealed concentrations of Br in linear features in samples from all but the topmost and bottommost depths. For those samples, the maps revealed rounded features. Calibration of the Br elemental maps showed bulk concentrations to be 5–10 g/m³, with concentrations ten times larger in the linear features. Through comparison with horizontal thin sections, we could verify that these linear features were brine sheets or layers.

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Research Organization:: Univ. of Chicago, IL (United States); Dartmouth College, Hanover, NH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-94ER14466; OPP-1043145; EAR-1128799

OSTI ID:: 1424016

Journal Information:: Earth and Space Science, Vol. 3, Issue 11; ISSN 2333-5084

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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