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| Titel |
Ultra high resolution cation analysis of NGRIP deep ice via cryo-cell UV-laser-ablation ICPMS |
| VerfasserIn |
Damiano Della Lunga, Wolfgang Müller, Sune Olander Rasmussen, Anders Svensson |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096166
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| Publikation (Nr.) |
 EGU/EGU2014-11660.pdf |
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| Zusammenfassung |
| During glacial periods, Earth experienced abrupt climate change events that led to rapid
natural warming/ cooling over a few years only (Steffensen et al., 2008).
In order to investigate these rapid climate events especially in old thinned ice, highest
spatial/time resolution analysis of climate proxies is required. A recently developed
methodology at Royal Holloway University of London (Müller et al., 2011), which permits in
situ chemical analysis of frozen ice with spatial (and thus time) resolution up to 0.1 mm (100
?m) using cryo-cell UV-laser ablation inductively-coupled-plasma mass spectrometry
(UV-LA-ICPMS), has been optimized and utilized for analysis of (major) elements indicative
of dust and/or sea salt (e.g. Fe, Al, Ca, Mg, Na), while maintaining detection limits in the
low(est) ppb-range.
NGRIP samples of Greenland Stadial GS22 (~86 ka, depth of ~2690 m), representing a
minor δ18O shift (of about ± 4) within the stadial phase of D-O event 22, have been selected
and analysed. With a single storm-event resolution capability, seasonal, annual and
multiannual periodicity of elements have been identified and will be presented with particular
focus on the phasing of the climate proxies. Corresponding results include also an optimized
UV-LA-ICPMS methodology, particularly with reference to depth-profiling, assessing
contamination of the sample surface and standardization. Finally, the location and distribution
of soluble and insoluble micro-inclusions in deep ice have also been assessed concerning
the partitioning of elements between grain boundaries and grain interiors. Results
show that impurities tend to be concentrated along boundaries in clear (winter) ice,
whereas in cloudy bands (‘dirtier’ ice) they distribute equally between boundaries and
interiors.
References
Müller, W., Shelley, J.M.G., Rasmussen, S.O., 2011. Direct chemical analysis of frozen
ice cores by UV-laser ablation ICPMS. J. Anal. At. Spectrom. 26, 2391-2395.
Steffensen, J.P., Andersen, K.K., Bigler, M., Clausen, H.B., Dahl-Jensen, D., Fischer, H.,
Goto-Azuma, K., Hansson, M., Johnsen, S.J., Jouzel, J., Masson-Delmotte, V., Popp, T.,
Rasmussen, S.O., Rothlisberger, R., Ruth, U., Stauffer, B., Siggaard-Andersen, M.L.,
Sveinbjornsdottir, A.E., Svensson, A., White, J.W.C., 2008. High-resolution Greenland Ice
Core data show abrupt climate change happens in few years. Science 321, 680-684. |
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