Change in ice rheology during climate variations - implications for ice flow modelling and dating of the EPICA Dome C core

被引：59

作者：

Durand, G.

Gillet-Chaulet, F.

Svensson, A.

Gagliardini, O.

Kipfstuhl, S.

Meyssonnier, J.

Parrenin, F.

Duval, P.

Dahl-Jensen, D.

机构：

[1] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[2] Lab Glaciol & Geophys Environm, St Martin Dheres, France

[3] Alfred Wegener Inst Polar & Marine Res, D-2850 Bremerhaven, Germany

来源：

CLIMATE OF THE PAST | 2007年 / 3卷 / 01期

关键词：

D O I：

10.5194/cp-3-155-2007

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The study of the distribution of crystallographic orientations ( i.e., the fabric) along ice cores provides information on past and current ice flow in ice- sheets. Besides the usually observed formation of a vertical single maximum fabric, the EPICA Dome C ice core ( EDC) shows an abrupt and unexpected strengthening of its fabric during termination II around 1750 m depth. Such strengthening has already been observed for sites located on an ice- sheet flank. This suggests that horizontal shear could occur along the EDC core. Moreover, the change in the fabric leads to a modification of the effective viscosity between neighbouring ice layers. Through the use of an anisotropic ice flow model, we quantify the change in effective viscosity and investigate its implication for ice flow and dating.

引用

页码：155 / 167

页数：13

共 55 条

[21] Lateral boundary conditions for a local anisotropic ice-flow model [J].