Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice
Abstract
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 ormore »
- Authors:
-
[1];
[1];
[1];
[1];
[2];
[3]
- 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
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States); Dartmouth College, Hanover, NH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1424016
- Grant/Contract Number:
- FG02-94ER14466; OPP-1043145; EAR-1128799
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Earth and Space Science
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2333-5084
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 47 OTHER INSTRUMENTATION; sea ice; synchrotron; X-ray fluorescence spectroscopy
Citation Formats
Obbard, Rachel W., Lieb-Lappen, Ross M., Nordick, Katherine V., Golden, Ellyn J., Leonard, Jeremiah R., Lanzirotti, Antonio, and Newville, Mathew G. Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice. United States: N. p., 2016.
Web. doi:10.1002/2016EA000172.
Obbard, Rachel W., Lieb-Lappen, Ross M., Nordick, Katherine V., Golden, Ellyn J., Leonard, Jeremiah R., Lanzirotti, Antonio, & Newville, Mathew G. Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice. United States. https://doi.org/10.1002/2016EA000172
Obbard, Rachel W., Lieb-Lappen, Ross M., Nordick, Katherine V., Golden, Ellyn J., Leonard, Jeremiah R., Lanzirotti, Antonio, and Newville, Mathew G. Sun .
"Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice". United States. https://doi.org/10.1002/2016EA000172. https://www.osti.gov/servlets/purl/1424016.
@article{osti_1424016,
title = {Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice},
author = {Obbard, Rachel W. and Lieb-Lappen, Ross M. and Nordick, Katherine V. and Golden, Ellyn J. and Leonard, Jeremiah R. and Lanzirotti, Antonio and Newville, Mathew G.},
abstractNote = {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.},
doi = {10.1002/2016EA000172},
journal = {Earth and Space Science},
number = 11,
volume = 3,
place = {United States},
year = {Sun Oct 23 00:00:00 EDT 2016},
month = {Sun Oct 23 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Microstructural characterization of snow, firn and ice
journal, April 2019
- Baker, Ian
- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2146
A network model for characterizing brine channels in sea ice
journal, January 2018
- Lieblappen, Ross M.; Kumar, Deip D.; Pauls, Scott D.
- The Cryosphere, Vol. 12, Issue 3