Competition between grain growth and grain-size reduction in polar ice

Authors: Roessiger, Jens; Bons, Paul D.; Griera, Albert; Jessell, Mark W.; Evans, Lynn; Montagnat, Maurine; Kipfstuhl, Sepp; Faria, Sérgio H.; Weikusat, Ilka

Source: Journal of Glaciology, Volume 57, Number 205, October 2011 , pp. 942-948(7)

Publisher: International Glaciological Society

Buy & download fulltext article:

OR

Price: $37.61 plus tax (Refund Policy)

Abstract:

Static (or 'normal') grain growth, i.e. grain boundary migration driven solely by grain boundary energy, is considered to be an important process in polar ice. Many ice-core studies report a continual increase in average grain size with depth in the upper hundreds of metres of ice sheets, while at deeper levels grain size appears to reach a steady state as a consequence of a balance between grain growth and grain-size reduction by dynamic recrystallization. The growth factor k in the normal grain growth law is important for any process where grain growth plays a role, and it is normally assumed to be a temperature-dependent material property. Here we show, using numerical simulations with the program Elle, that the factor k also incorporates the effect of the microstructure on grain growth. For example, a change in grain-size distribution from normal to log-normal in a thin section is found to correspond to an increase in k by a factor of 3.5.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/002214311798043690

Publication date: October 1, 2011

More about this publication?
  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
  • Editorial Board
  • Information for Authors
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page