Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn
The Antarctic and Greenland ice sheets store a significant amount of air within their upper, approximately thousand meters. Research shows how the presence of air inclusions can influence the microdynamical processes that affect the flow of ice (Azuma et al., 2012, Roessiger et al., 2014). The micro...
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ftawi:oai:epic.awi.de:40936 2024-09-15T17:47:06+00:00 Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn Steinbach, Florian Weikusat, Ilka Bons, Paul D. Griera, Albert Llorens Verde, Maria Gema Roessiger, Jens 2016-03-07 application/pdf https://epic.awi.de/id/eprint/40936/ https://epic.awi.de/id/eprint/40936/1/Florian_IPICS2016_FINAL.pdf http://www.ipics2016.org/ https://hdl.handle.net/10013/epic.47920 https://hdl.handle.net/10013/epic.47920.d001 unknown https://epic.awi.de/id/eprint/40936/1/Florian_IPICS2016_FINAL.pdf https://hdl.handle.net/10013/epic.47920.d001 Steinbach, F. , Weikusat, I. orcid:0000-0002-3023-6036 , Bons, P. D. , Griera, A. , Llorens Verde, M. G. and Roessiger, J. (2016) Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn , Second Open Science Conference of the International Partnerships in Ice Core Sciences (IPICS2016), Hobart, Australia, 7 March 2016 - 11 March 2016 . hdl:10013/epic.47920 EPIC3Second Open Science Conference of the International Partnerships in Ice Core Sciences (IPICS2016), Hobart, Australia, 2016-03-07-2016-03-11 Conference notRev 2016 ftawi 2024-06-24T04:14:20Z The Antarctic and Greenland ice sheets store a significant amount of air within their upper, approximately thousand meters. Research shows how the presence of air inclusions can influence the microdynamical processes that affect the flow of ice (Azuma et al., 2012, Roessiger et al., 2014). The microdynamics of pure ice were successfully modelled by e.g. Montagnat et al. (2014) or Llorens et al. (2015), but studies taking into account second phases are scarce. Therefore, polyphase modelling was performed to focus on the implications of bubbles on recrystallisation and deformation. The full-field theory crystal plasticity code (FFT) of Lebensohn (2001), was coupled to the 2D multi-process modelling platform Elle (Bons et al., 2008), following the approach by Griera et al. (2013). FFT calculates the viscoplastic response of polycrystalline materials deforming by dislocation glide, taking into account mechanical anisotropy. Our models further incorporate surface- and strain-energy driven grain boundary migration and intracrystalline recovery. Sequential operation of each process for small time steps enables multi-process modelling of deformation and concurrent recrystallisation. Results show that air inclusions lead to increased strain localization and hence locally enhanced dynamic recrystallisation. This is in accordance with Faria et al. (2014), who theoretically predicted such localization, based on firn data from the EPICA Dronning Maud Land (EDML) deep ice core. Our results confirm that strain-induced grain boundary migration already occurs in the uppermost levels of ice sheets, as observed by Kipfstuhl et al. (2009) and Weikusat et al. (2009) in the EDML core. References Azuma, N., et al. (2012) Journal of Structural Geology, 42, 184-193 Bons, P.D., et al. (2008) Lecture Notes in Earth Sciences, 106 Faria, S.H., et al. (2014) Journal of Structural Geology, 61, 21-49 Griera, A., et al. (2013) Tectonophysics, 587, 4-29 Kipfstuhl, S., et al. (2009) Journal of Geophysical Research, 114, B05204 Lebensohn, R.A. ... Conference Object Antarc* Antarctic Dronning Maud Land EPICA Greenland ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The Antarctic and Greenland ice sheets store a significant amount of air within their upper, approximately thousand meters. Research shows how the presence of air inclusions can influence the microdynamical processes that affect the flow of ice (Azuma et al., 2012, Roessiger et al., 2014). The microdynamics of pure ice were successfully modelled by e.g. Montagnat et al. (2014) or Llorens et al. (2015), but studies taking into account second phases are scarce. Therefore, polyphase modelling was performed to focus on the implications of bubbles on recrystallisation and deformation. The full-field theory crystal plasticity code (FFT) of Lebensohn (2001), was coupled to the 2D multi-process modelling platform Elle (Bons et al., 2008), following the approach by Griera et al. (2013). FFT calculates the viscoplastic response of polycrystalline materials deforming by dislocation glide, taking into account mechanical anisotropy. Our models further incorporate surface- and strain-energy driven grain boundary migration and intracrystalline recovery. Sequential operation of each process for small time steps enables multi-process modelling of deformation and concurrent recrystallisation. Results show that air inclusions lead to increased strain localization and hence locally enhanced dynamic recrystallisation. This is in accordance with Faria et al. (2014), who theoretically predicted such localization, based on firn data from the EPICA Dronning Maud Land (EDML) deep ice core. Our results confirm that strain-induced grain boundary migration already occurs in the uppermost levels of ice sheets, as observed by Kipfstuhl et al. (2009) and Weikusat et al. (2009) in the EDML core. References Azuma, N., et al. (2012) Journal of Structural Geology, 42, 184-193 Bons, P.D., et al. (2008) Lecture Notes in Earth Sciences, 106 Faria, S.H., et al. (2014) Journal of Structural Geology, 61, 21-49 Griera, A., et al. (2013) Tectonophysics, 587, 4-29 Kipfstuhl, S., et al. (2009) Journal of Geophysical Research, 114, B05204 Lebensohn, R.A. ... |
format |
Conference Object |
author |
Steinbach, Florian Weikusat, Ilka Bons, Paul D. Griera, Albert Llorens Verde, Maria Gema Roessiger, Jens |
spellingShingle |
Steinbach, Florian Weikusat, Ilka Bons, Paul D. Griera, Albert Llorens Verde, Maria Gema Roessiger, Jens Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
author_facet |
Steinbach, Florian Weikusat, Ilka Bons, Paul D. Griera, Albert Llorens Verde, Maria Gema Roessiger, Jens |
author_sort |
Steinbach, Florian |
title |
Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
title_short |
Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
title_full |
Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
title_fullStr |
Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
title_full_unstemmed |
Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
title_sort |
microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/40936/ https://epic.awi.de/id/eprint/40936/1/Florian_IPICS2016_FINAL.pdf http://www.ipics2016.org/ https://hdl.handle.net/10013/epic.47920 https://hdl.handle.net/10013/epic.47920.d001 |
genre |
Antarc* Antarctic Dronning Maud Land EPICA Greenland ice core |
genre_facet |
Antarc* Antarctic Dronning Maud Land EPICA Greenland ice core |
op_source |
EPIC3Second Open Science Conference of the International Partnerships in Ice Core Sciences (IPICS2016), Hobart, Australia, 2016-03-07-2016-03-11 |
op_relation |
https://epic.awi.de/id/eprint/40936/1/Florian_IPICS2016_FINAL.pdf https://hdl.handle.net/10013/epic.47920.d001 Steinbach, F. , Weikusat, I. orcid:0000-0002-3023-6036 , Bons, P. D. , Griera, A. , Llorens Verde, M. G. and Roessiger, J. (2016) Microdynamical simulations of polyphase deformation and recrystallisation processes in polar ice and firn , Second Open Science Conference of the International Partnerships in Ice Core Sciences (IPICS2016), Hobart, Australia, 7 March 2016 - 11 March 2016 . hdl:10013/epic.47920 |
_version_ |
1810495718631145472 |