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Rachel W. Obbard on Muck Rack

Rachel W. Obbard

As seen in: Color Research & Application, Nature
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Articles

The first physical evidence of subglacial volcanism under the West Antarctic Ice Sheet

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By Ross M. Lieb-Lappen, Nelia W. Dunbar, Rachel W. Obbard, Nels A. Iverson
| Nature Verified
Tephra B contains large particles and has been geochemically correlated to the source volcano Mt. Berlin, which is 670?km from the drill site. Based on SEM observation, the morphology of many of the shards in Tephra B are distinctly magmatic, i.e. more vesiculated and less blocky than those observed in Tephra A and C. Furthermore, the composition is trachytic.
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Synchrotron X-ray fluorescence spectroscopy of salts in natural sea ice

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By Antonio Lanzirotti, Rachel W. Obbard, Ross M. Lieb-Lappen, Katherine V. Nordick, Ellyn J. Golden, Jeremiah R. Leonard, Mathew G. Newville
| Color Research & Application Verified
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.
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