Temperature reconstruction from 10 to 120 kyr b2k from the NGRIP ice core

Kindler, Philippe; Guillevic, M.; Baumgartner, Michael Franz; Schwander, Jakob; Landais, A.; Leuenberger, Markus (2014). Temperature reconstruction from 10 to 120 kyr b2k from the NGRIP ice core. Climate of the past, 10(2), pp. 887-902. Copernicus Publications 10.5194/cp-10-887-2014

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Other Institutions > Teaching Staff, Faculty of Science

UniBE Contributor:

Kindler, Philippe; Baumgartner, Michael Franz; Schwander, Jakob and Leuenberger, Markus

Subjects:

500 Science > 530 Physics

ISSN:

1814-9324

Publisher:

Copernicus Publications

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

18 Aug 2014 15:09

Last Modified:

13 Jul 2015 15:01

Publisher DOI:

10.5194/cp-10-887-2014

BORIS DOI:

10.7892/boris.57912

URI:

https://boris.unibe.ch/id/eprint/57912

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