Impurity Analysis and Microstructure Along the Climatic Transition From MIS 6 Into 5e in the EDML Ice Core Using Cryo-Raman Microscopy ...
Impurities in polar ice cores have been studied so far mainlyfor the purpose ofreconstructions of past atmospheric aerosol concentrations. However, impurities alsocritically influence physical properties of the ice matrix itself. To improve the data basisregarding thein-situform of incorporation and...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Text |
| Language: | English |
| Published: |
Frontiers Media
2019
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.7892/boris.128737 https://boris.unibe.ch/128737/ |
| Summary: | Impurities in polar ice cores have been studied so far mainlyfor the purpose ofreconstructions of past atmospheric aerosol concentrations. However, impurities alsocritically influence physical properties of the ice matrix itself. To improve the data basisregarding thein-situform of incorporation and spatial distribution of impurities in ice weused micro-cryo-Raman spectroscopy to identify the location, phase and compositionof micrometer-sized inclusions in natural ice samples around the transition from marineisotope stage (MIS) 6 into 5e in the EDML ice core. The combination of Raman resultswith ice-microsctructure measurements and complementaryimpurity data provided bythe standard analytical methods (IC, CFA, and DEP) allows for a more interdisciplinaryapproach interconnecting ice core chemistry and ice core physics. While the interglacialsamples were dominated by sulfate salts—mainly gypsum, sodium sulfate (possiblythenardite) and iron–potassium sulfate (likely jarosite)—the glacial ice contained ... |
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