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| Titel |
Temperature reconstruction from 10 to 120 kyr b2k from the NGRIP ice core |
| VerfasserIn |
P. Kindler, M. Guillevic, M. Baumgartner, J. Schwander, A. Landais, M. Leuenberger |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2014-04-30), S.887-902 |
| Datensatznummer |
250116960
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| Publikation (Nr.) |
 copernicus.org/cp-10-887-2014.pdf |
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| Zusammenfassung |
| In order to reconstruct the temperature of the North Greenland Ice Core
Project (NGRIP) site, new measurements of δ15N have been performed
covering the time period from the beginning of the Holocene to
Dansgaard–Oeschger (DO) event 8. Together with previously measured and
mostly published δ15N data, we present for the first time a NGRIP
temperature reconstruction for the whole last glacial period from 10 to
120 kyr b2k (thousand years before 2000 AD) including every DO event based
on δ15N isotope measurements combined with a firn densification and
heat diffusion model. The detected temperature rises at the onset of DO
events range from 5 °C (DO 25) up to 16.5 °C (DO 11) with an
uncertainty of ±3 °C. To bring measured and modelled data into
agreement, we had to reduce the accumulation rate given by the NGRIP
ss09sea06bm timescale in some periods by 30 to 35%, especially during the
last glacial maximum. A comparison between reconstructed temperature and
δ18Oice data confirms that the isotopic composition of
the stadial was strongly influenced by seasonality. We evidence
an anticorrelation between the variations of the
δ18Oice sensitivity to temperature (referred to as
α) and obliquity in agreement with a simple Rayleigh distillation
model. Finally, we suggest that α might be influenced by the Northern
Hemisphere ice sheet volume. |
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