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Deduction of surface accumulation history from ice-core age/depth data
Citation
Morland, LW and Jacka, TH, Deduction of surface accumulation history from ice-core age/depth data, Journal of Glaciology, 59, (213) pp. 81-86. ISSN 0022-1430 (2013) [Refereed Article]
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Copyright Statement
Copyright 2013 International Glaciological Society
DOI: doi:10.3189/2013JoG12J102
Abstract
Ice-core data are the only source of ice response on timescales of hundreds to thousands of years, which is necessary to describe polar ice-sheet flows and their interaction with changing climatic conditions. Ice properties, such as a grain growth relation, require knowledge of each ice particle's history since first deposited at the surface, and not simply the present core state. This study is an analysis of 11 'present' ice cores, using their age/depth data and present accumulation, to infer their past accumulation and mean strain rate and, in turn, the strain at each level of the core. These are the ingredients necessary to determine the particle paths and associated evolution of properties. The conventional assumptions of a purely vertical velocity distribution with a uniform compressive strain rate in the core are made, but unlike an earlier analysis which allowed independent surface accumulation and strain-rate histories, it is now assumed that the strain rate is proportional to the accumulation. Determination of the past accumulation and proportionality factor is accomplished by correlation with the present age/depth data, and while good correlations are obtained – a consistent solution – other close correlations can yield quite different accumulation histories and corresponding proportional strain-rate histories.
Item Details
Item Type: | Refereed Article |
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Keywords: | ice-core, surface accumulation history, polar ice-sheet flows |
Research Division: | Earth Sciences |
Research Group: | Physical geography and environmental geoscience |
Research Field: | Glaciology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Jacka, TH (Dr Jo Jacka) |
ID Code: | 93959 |
Year Published: | 2013 |
Deposited By: | CRC-Antarctic Climate & Ecosystems |
Deposited On: | 2014-08-25 |
Last Modified: | 2015-07-13 |
Downloads: | 668 View Download Statistics |
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