 |
| Titel |
First investigations of an ice core from Eisriesenwelt cave (Austria) |
| VerfasserIn |
B. May, Christoph Spötl, D. Wagenbach, Y. Dublyansky, J. Liebl |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 1 ; Nr. 5, no. 1 (2011-02-16), S.81-93 |
| Datensatznummer |
250002272
|
| Publikation (Nr.) |
 copernicus.org/tc-5-81-2011.pdf |
|
|
|
| Schlagwörter |
Höhle, Eishöhle, Eiskernung, Kernbohrung, Datierung, Stabile Isotope, Tritiummessungen, Dachsteinkalk, Trias, Mesozoikum, Nördliche Kalkalpen |
| Geograf. Schlagwort |
Österreich, Salzburg, Sankt Johann im Pongau (Bezirk), Eisriesenwelt, Tennengebirge |
| Blattnummer |
94 [Hallein] |
| Blattnummer (UTM) |
3216 [Bischofshofen] |
|
|
|
|
|
| Zusammenfassung |
| Investigations into the genesis and dynamical properties of cave ice are
essential for assessing the climate significance of these underground
glaciers. We drilled an ice core through a 7.1 m-thick ice body filling a
large cavern of the dynamic ice cave Eisenriesenwelt (Austria). In addition
to visual core inspections, quasi-continuous measurements at 2 cm resolution
comprised particulate matter, stable water isotope (δ18O, δD) and electrolytic conductivity profiles supplemented by
specifically selected samples analyzed for tritium and radiocarbon. We found
that recent ablation led to an almost complete loss of bomb-derived tritium
removing any ice accumulated since, at least, the early fifties leaving the
actual ice surface even below the natural tritium level. The small
particulate organic masses rendered radiocarbon dating inconclusive, though
a crude estimate gave a basal ice age in the order of several thousand
years. The visual stratigraphy and all investigated parameters showed a
clear dichotomy between the upper 2 m and the bottom 3 m of the core, which
points to a substantial change in the ice formation process. Main features
of the core comprise the changing appearance and composition of distinct
cryocalcite layers, extremely low total ion content and a surprisingly high
variability of the isotope signature. Co-isotope evaluation (δD
versus δ18O) of the core in comparison with data from
precipitation and karst spring water clearly indicate that ice formation is
governed by (slow) freezing of dripping water. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|