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Thick-section images of the EDML ice core from 2300 to 2400 m depth

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.552368
Keywords
  • Calculated Average/Mean Values
  • Dml28C01_00
  • Edml
  • Epica
  • Epica-Campaigns
  • Epica Drill
  • European Project For Ice Coring In Antarctica
  • File Size
  • Focus Level Below Section Surface
  • Height
  • Kohnen Station
  • Number Of Pictures In Row
  • Number Of Rows
  • Optical Microscopy
  • Sample Code/Label
  • Section
  • Section Length
  • Section Thickness
  • Section Width
  • Uniform Resource Locator/Link To Metadata File
  • Uniform Resource Locator/Link To Raw Data File
  • Vernier Caliper
  • Width
  • Xy-Stage

Abstract

t12J245 972..980 High-resolution variations in size, number and arrangement of air bubbles in the EPICA DML (Antarctica) ice core Verena BENDEL,1� Kai J. UELTZHO¨FFER,2 Johannes FREITAG,3 Sepp KIPFSTUHL,3 Werner F. KUHS,1 Christoph S. GARBE,2 Se´rgio H. FARIA1;4;5 1Department of Crystallography, Geoscience Centre, University of Go¨ttingen, Go¨ttingen, Germany E-mail: [email protected] 2Interdisciplinary Centre for Scientific Computing, University of Heidelberg, Heidelberg, Germany 3Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany 4Basque Centre for Climate Change (BC3), Bilbao, Spain 5IKERBASQUE, Basque Foundation for Science, Bilbao, Spain ABSTRACT. We investigated the large-scale (10–1000m) 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, dd18O, 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. 1. INTRODUCTION Polar ice cores are essential

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