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| Titel |
Palynology as an age-control tool for ice cores. First results of PAMOGIS - Pollen Analyses of the Mt. Ortles Glacier Ice Samples |
| VerfasserIn |
Daniela Festi, Werner Kofler, Paolo Gabrielli, Klaus Oeggl  |
| 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 |
250086696
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| Publikation (Nr.) |
 EGU/EGU2014-609.pdf |
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| Zusammenfassung |
| Glacier ice cores from the mid latitude are capable of retaining essential information on past
climate, environmental and human activities on a seasonal/annual time resolution.
However, for a correct interpretation of the ice record a good chronological control
is essential. Absolute time markers such as 3H peaks and Sahara dust horizons,
together with radiometric methods such as 210Pb, radiocarbon from carbonaceous
aerosol particles and AMS-dating are commonly used to obtain the age depth model
of ice cores. In this frame we present the first pollen-based chronology from the
Eastern Alps. Results of pollen analyses performed on a 10 m firn core taken on
the top of Alto dell’Ortles Glacier (3905 m a.s.l.) will be discussed. Palynological
data are compared and complemented with stable isotopes, major ions and trace
elements analyses. Based on the single species flowering periods, our results show that
the pollen spectrum presents seasonal and inter-annual variability that enables to
distinguish snow accumulated in the three different flowering seasons and winter
snow. According to these four components a seasonal and annual chronology was
established, proving that the 10 m firn core encompasses four years of snow accumulation
and presents a clear seasonal palynological signal. These first results reveal the
potential of pollen content of glacier snow and ice as a chronological tool that can
contribute to the construction of a robust chronological model with a seasonal to
annual resolution. This study is the first step and the base for future research on
deeper ice cores on the Alto dell’Ortles Glacier (Ortles project: www.ortles.org). |
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