dc.contributor.author
Montagnat, M.
dc.contributor.author
Azuma, N.
dc.contributor.author
Dahl-Jensen, D.
dc.contributor.author
Eichler, J.
dc.contributor.author
Fujita, S.
dc.contributor.author
Gillet-Chaulet, F.
dc.contributor.author
Kipfstuhl, S.
dc.contributor.author
Samyn, D.
dc.contributor.author
Svensson, A.
dc.contributor.author
Weikusat, I.
dc.date.accessioned
2018-06-08T02:58:35Z
dc.date.available
2014-10-27T09:34:33.931Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/14245
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-18440
dc.description.abstract
Fabric (distribution of crystallographic orientations) along the full NEEM ice
core, Greenland was measured in the field by an automatic ice texture analyzer
every 10 m, from 33 m down to 2461 m depth. The fabric evolves from a slightly
anisotropic fabric at the top, toward a strong single maximum at about 2300 m,
which is typical of a deformation pattern mostly driven by uniaxial
compression and simple shearing. A sharp increase in the fabric strengthening
rate is observed at the Holocene to Wisconsin (HW) climatic transition. From a
simple model we estimate that this depth is located at a transition from a
state dominated by vertical compression to a state dominated by vertical
shear. Comparisons are made to two others ice cores drilled along the same
ridge; the GRIP ice core, drilled at the summit of the ice sheet, and the
NGRIP ice core, drilled 325 km to the NNW of the summit along the ridge, and
365 km upstream from NEEM. This comparison tends to demonstrate that the ice
viscosity change with the HW climatic transition must be associated with the
shear-dominated state to induce the abrupt fabric strengthening observed at
NEEM. This comparison therefore reflects the increasing role of shear
deformation on the coring site when moving NW along the ridge from GRIP to
NGRIP and NEEM. The difference in fabric profiles between NEEM and NGRIP also
evidences a stronger lateral extension associated with a sharper ridge at
NGRIP. Further along the core, centimeter scale abrupt texture (fabric and
microstructure) variations are observed in the bottom part of the core. Their
positions are in good agreement with the observed folding layers in Dahl-
Jensen et al. (2013).
en
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/de/
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie
dc.title
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and
NGRIP ice cores
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
The Cryosphere. - 8, (2014), 4, S. 1129-1138
dcterms.bibliographicCitation.doi
10.5194/tc-8-1129-2014
dcterms.bibliographicCitation.url
http://dx.doi.org/10.5194/tc-8-1129-2014
refubium.affiliation
Geowissenschaften
de
refubium.mycore.fudocsId
FUDOCS_document_000000021203
refubium.note.author
Der Artikel wurde in einer Open-Access-Zeitschrift publiziert.
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000004091
dcterms.accessRights.openaire
open access