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Publication:
Visual stratigraphy of the North Greenland Ice Core Project (NorthGRIP) ice core during the last glacial period

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dc.contributor.authorSvensson, Anders
dc.contributor.authorNielsen, Søren Wedel
dc.contributor.authorKipfstuhl, Sepp
dc.contributor.authorJohnsen, Sigfus J.
dc.contributor.authorSteffensen, Jørgen Peder
dc.contributor.authorBigler, Matthias
dc.contributor.authorRuth, Urs
dc.contributor.authorRöthlisberger, Regine
dc.date.accessioned2024-09-02T17:44:08Z
dc.date.available2024-09-02T17:44:08Z
dc.date.issued2005
dc.description.abstractA continuous high-resolution record of digital images has been obtained from the North Greenland Ice Core Project (NorthGRIP) ice core (75.1°N, 42.3°W) in the depth interval from 1330 m to the bedrock at 3085 m. The ice core stratigraphy is clearly visible throughout the glacial period with the most frequent and brightest visible layers appearing during the coldest events. Down to a depth of 2600 m the horizontal layering is very regular; below this depth, small irregularities in the layering start to appear, and below 2800 m the visual stratigraphy becomes more uncertain, perhaps because of penetration into climatically warmer ice. Comparison of the visual stratigraphy with high-resolution continuous records of chemical impurities and dust reveals a high degree of correlation, which indicates that the visible layers are caused by these impurities. A new approach is used to automatically determine annual layer thicknesses from the visual stratigraphy record by carrying out a frequency analysis of the most prominent visible layers in the profile. The result gives strong support for the NorthGRIP timescale model.
dc.description.numberOfPages11
dc.description.sponsorshipPhysikalisches Institut, Klima- und Umweltphysik (KUP)
dc.identifier.doi10.48350/158304
dc.identifier.publisherDOI10.1029/2004JD005134
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/43052
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.relation.issn2169-897X
dc.relation.organizationDCD5A442BF29E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::580 - Plants (Botany)
dc.subject.ddc500 - Science::530 - Physics
dc.titleVisual stratigraphy of the North Greenland Ice Core Project (NorthGRIP) ice core during the last glacial period
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage11
oaire.citation.issueD2
oaire.citation.startPage1
oaire.citation.volume110
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oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
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unibe.date.licenseChanged2021-08-19 14:11:44
unibe.description.ispublishedpub
unibe.eprints.legacyId158304
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unibe.subtype.articlejournal

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