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| Titel |
Raman spectroscopy on ice cores from Greenland and Antarctica |
| VerfasserIn |
C. Weikusat, S. Kipfstuhl |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064828
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| Zusammenfassung |
| Ice cores are invaluable archives for the reconstruction of the climatic history of the earth.
Besides the analysis of various climatic processes from isotopes and chemical signatures
they offer the unique possibility of directly extracting the past atmosphere from
gaseous inclusions in the ice. Many aspects of the formation and alterations of these
inclusions, e.g. the entrapment of air at the firn-ice-transition, the formation of
crystalline gas hydrates (clathrates) from the bubbles or the structural relaxation during
storage of the cores, need to be better understood to enable reliable interpretations
of the obtained data. Modern micro Raman spectroscopy is an excellent tool to
obtain high-quality data for all of these aspects. It has been productively used for
phase identification of solid inclusions [1], investigation of air clathrates [2] and
high-resolution measurements of N2/O2 mixing ratios inside individual air bubbles
[3,4].
Detailed examples of the various uses of Raman spectroscopy will be presented along
with practical information about the techniques required to obtain high-quality spectra.
Retrieval and interpretation of quantitative data from the spectra will be explained. Future
possibilities for advanced uses of Raman spectroscopy for ice core research will be
discussed.
[1] T. Sakurai et al., 2009, Direct observation of salts as micro-inclusions in the Greenland GRIP ice
core. Journal of Glaciology, 55, 777-783.
[2] F. Pauer et al., 1995, Raman spectroscopic study of nitrogen/oxygen ratio in natural ice clathrates in
the GRIP ice core. Geophysical Research Letters, 22, 969-971.
[3] T. Ikeda-Fukazawa et al., 2001, Variation in N2-O2 ratio of occluded air in Dome Fuji antarctic ice.
Journal of Geophysical Research, 106, 17799-17810.
[4] C. Weikusat et al., Raman spectroscopy of gaseous inclusions in EDML ice core: First results -
microbubbles. Journal of Glaciology, accepted. |
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