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| Titel |
NALPS: a precisely dated European climate record 120–60 ka |
| VerfasserIn |
R. Boch, H. Cheng, Christoph Spötl, R. L. Edwards, X. Wang, Ph. Häuselmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 7, no. 4 ; Nr. 7, no. 4 (2011-11-24), S.1247-1259 |
| Datensatznummer |
250004685
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| Publikation (Nr.) |
 copernicus.org/cp-7-1247-2011.pdf |
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| Schlagwörter |
Höhle, Naturdenkmal (Höhle), Klima, Paläoklima, Klimawandel, Stalagmit, Isotopenmessung, Sauerstoffisotope, Datierung, Uran-Thorium-Methode, Geochronologie, Schrattenkalk, Helvetikum |
| Geograf. Schlagwort |
Österreich, Vorarlberg, Bregenz (Bezirk), Schneckenlochhöhle, Bregenzerwald, Schweiz |
| Blattnummer |
111 [Dornbirn], 112 [Bezau] |
| Blattnummer (UTM) |
2219 [Lech], 2224 [Schwaz] |
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| Zusammenfassung |
| Accurate and precise chronologies are essential in understanding the rapid
and recurrent climate variations of the Last Glacial – known as
Dansgaard-Oeschger (D-O) events – found in the Greenland ice cores and
other climate archives. The existing chronological uncertainties during the
Last Glacial, however, are still large. Radiometric age data and stable
isotopic signals from speleothems are promising to improve the absolute
chronology. We present a record of several precisely dated stalagmites from
caves located at the northern rim of the Alps (NALPS), a region that favours
comparison with the climate in Greenland. The record covers most of the
interval from 120 to 60 ka at an average temporal resolution of 2 to 22 yr
and 2σ-age uncertainties of ca. 200 to 500 yr. The rapid and large
oxygen isotope shifts of 1 to 4.5‰ occurred within decades to centuries and
strongly mimic the Greenland D-O pattern. Compared to the updated Greenland
ice-core timescale (GICC05modelext) the NALPS record confirms the timing of
rapid warming and cooling transitions between 118 and 106 ka, but suggests
younger ages for D-O events between 106 and 60 ka. As an exception, the
timing of the rapid transitions into and out of the stadial following GI 22
is earlier in NALPS than in the Greenland ice-core timescale. In addition,
there is a discrepancy in the duration of this stadial between the ice-core
and the stalagmite chronology (ca. 2900 vs. 3650 yr). The short-lived D-O
events 18 and 18.1 are not recorded in NALPS, provoking questions with
regard to the nature and the regional expression of these events. NALPS
resolves recurrent short-lived climate changes within the cold Greenland
stadial and warm interstadial successions, i.e. abrupt warming events
preceding GI 21 and 23 (precursor-type events) and at the end of GI 21 and
25 (rebound-type events), as well as intermittent cooling events during GI
22 and 24. Such superimposed events have not yet been documented outside
Greenland. |
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