Bendel, Verena

[["dc.bibliographiccitation.firstpage","972"],["dc.bibliographiccitation.issue","217"],["dc.bibliographiccitation.journal","Journal of Glaciology"],["dc.bibliographiccitation.lastpage","980"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Ueltzhoeffer, Kai J."],["dc.contributor.author","Freitag, Johannes"],["dc.contributor.author","Kipfstuhl, Sepp"],["dc.contributor.author","Kuhs, Werner F."],["dc.contributor.author","Garbe, Christoph S."],["dc.contributor.author","Faria, Sergio H."],["dc.date.accessioned","2018-11-07T09:29:35Z"],["dc.date.available","2018-11-07T09:29:35Z"],["dc.date.issued","2013"],["dc.description.abstract","We investigated the large-scale (10-1000 m) and small-scale (mm-cm) variations in size, number and arrangement of air bubbles in the EPICA Dronning Maud Land (EDML) (Antarctica) ice core, down to the end of the bubble/hydrate transition (BHT) zone. On the large scale, the bubble number density shows a general correlation with the palaeo-temperature proxy, delta O-18, and the dust concentration, which means that in Holocene ice there are fewer bubbles than in glacial ice. Small-scale variations in bubble number and size were identified and compared. Above the BHT zone there exists a strong anticorrelation between bubble number density and mean bubble size. In glacial ice, layers of high number density and small bubble size are linked with layers with high impurity content, identified as cloudy bands. Therefore, we regard impurities as a controlling factor for the formation and distribution of bubbles in glacial ice. The anticorrelation inverts in the middle of the BHT zone. In the lower part of the BHT zone, bubble-free layers exist that are also associated with cloudy bands. The high contrast in bubble number density in glacial ice, induced by the impurities, indicates a much more pronounced layering in glacial firn than in modern firn."],["dc.identifier.doi","10.3189/2013JoG12J245"],["dc.identifier.isi","000325385200015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31072"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Int Glaciol Soc"],["dc.relation.issn","1727-5652"],["dc.relation.issn","0022-1430"],["dc.title","High-resolution variations in size, number and arrangement of air bubbles in the EPICA DML (Antarctica) ice core"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","339"],["dc.bibliographiccitation.issue","196"],["dc.bibliographiccitation.journal","Journal of Glaciology"],["dc.bibliographiccitation.lastpage","348"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Ueltzhoeffer, Kai J."],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Freitag, Johannes"],["dc.contributor.author","Kipfstuhl, Sepp"],["dc.contributor.author","Wagenbach, Dietmar"],["dc.contributor.author","Faria, Sergio H."],["dc.contributor.author","Garbe, Christoph S."],["dc.date.accessioned","2018-11-07T08:47:57Z"],["dc.date.available","2018-11-07T08:47:57Z"],["dc.date.issued","2010"],["dc.description.abstract","Air bubbles in ice cores play an essential role in climate research, not only because they contain samples of the palaeoatmosphere, but also because their shape, size and distribution provide information about the past firn structure and the embedding of climate records into deep ice cores. In this context, we present profiles of average bubble size and bubble number for the entire EDML (Antarctica) core and the top 600 m of the EDC (Antarctica) core, and distributions of bubble sizes from selected depths. The data are generated with an image-processing framework which automatically extracts position, orientation, size and shape of an elliptical approximation of each bubble from thick-section micrographs, without user interaction. The presented software framework allows for registration of overlapping photomicrographs to yield accurate locations of bubble-like features. A comparison is made between the bubble parameterizations in the EDML and EDC cores and data published on the Vostok (Antarctica) ice core. The porosity at the firn/ice transition is inferred to lie between 8.62% and 10.48% for the EDC core and between 10.56% and 12.61% for the EDML core."],["dc.identifier.isi","000280258200016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21084"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Int Glaciol Soc"],["dc.relation.issn","0022-1430"],["dc.title","Distribution of air bubbles in the EDML and EDC (Antarctica) ice cores, using a new method of automatic image analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]