Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy

Microstructure analysis of ice cores is vital to understand the processes controlling the flow of ice on the microscale. To quantify the microstructural variability (and thus occurring processes) on centimeter, meter and kilometer scale along deep polar ice cores, a large number of sections has to b...

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Main Authors: Binder, Tobias, Weikusat, Ilka, Garbe, Christoph S., Svensson, Anders, Kipfstuhl, Sepp
Format: Conference Object
Language:unknown
Published: 2014
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Online Access:https://epic.awi.de/id/eprint/35486/
https://epic.awi.de/id/eprint/35486/1/EGU2014-12098.pdf
https://hdl.handle.net/10013/epic.43459
https://hdl.handle.net/10013/epic.43459.d001
id ftawi:oai:epic.awi.de:35486
record_format openpolar
spelling ftawi:oai:epic.awi.de:35486 2024-09-15T18:10:09+00:00 Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy Binder, Tobias Weikusat, Ilka Garbe, Christoph S. Svensson, Anders Kipfstuhl, Sepp 2014 application/pdf https://epic.awi.de/id/eprint/35486/ https://epic.awi.de/id/eprint/35486/1/EGU2014-12098.pdf https://hdl.handle.net/10013/epic.43459 https://hdl.handle.net/10013/epic.43459.d001 unknown https://epic.awi.de/id/eprint/35486/1/EGU2014-12098.pdf https://hdl.handle.net/10013/epic.43459.d001 Binder, T. , Weikusat, I. orcid:0000-0002-3023-6036 , Garbe, C. S. , Svensson, A. and Kipfstuhl, S. (2014) Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy , EGU General Assembly 2014, Vienna, 27 April 2014 - 2 May 2014 . hdl:10013/epic.43459 EPIC3EGU General Assembly 2014, Vienna, 2014-04-27-2014-05-02 Conference notRev 2014 ftawi 2024-06-24T04:09:53Z Microstructure analysis of ice cores is vital to understand the processes controlling the flow of ice on the microscale. To quantify the microstructural variability (and thus occurring processes) on centimeter, meter and kilometer scale along deep polar ice cores, a large number of sections has to be analyzed. In the last decade, two different methods have been applied: On the one hand, transmission optical microscopy of thin sections between crossed polarizers yields information on the distribution of crystal c-axes. On the other hand, reflection optical microscopy of polished and controlled sublimated section surfaces allows to characterize the high resolution properties of a single grain boundary, e.g. its length, shape or curvature (further developed by [S. Kipfstuhl et al., 2006, Journal of Glaciology, 52, 398-406]). Along the entire NEEM ice core (North-West Greenland, 2537 m length) drilled in 2008-2011 we applied both methods to the same set of vertical sections. The data set comprises series of six consecutive 6 x 9 cm2 sections in steps of 20 m – in total about 800 images. A dedicated method for automatic processing and matching both image types has recently been developed [T. Binder et al., 2013, Journal of Microscopy, 250, 130-141]. The high resolution properties of the grain boundary network are analyzed. Furthermore, the automatic assignment of c-axis misorientations to visible sublimation grooves enables us to quantify the degree of similarity between the microstructure revealed by both analysis techniques. The reliability to extract grain boundaries from both image types as well as the appearance of sublimation groove patterns exhibiting low misorientations is investigated. X-ray Laue diffraction measurements (yielding full crystallographic orientation) have validated the sensitivity of the surface sublimation method for sub-grain boundaries [I. Weikusat et al., 2011, Journal of Glaciology, 57, 111-120]. We introduce an approach for automatic extraction of sub-grain structures from sublimation ... Conference Object Greenland ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description Microstructure analysis of ice cores is vital to understand the processes controlling the flow of ice on the microscale. To quantify the microstructural variability (and thus occurring processes) on centimeter, meter and kilometer scale along deep polar ice cores, a large number of sections has to be analyzed. In the last decade, two different methods have been applied: On the one hand, transmission optical microscopy of thin sections between crossed polarizers yields information on the distribution of crystal c-axes. On the other hand, reflection optical microscopy of polished and controlled sublimated section surfaces allows to characterize the high resolution properties of a single grain boundary, e.g. its length, shape or curvature (further developed by [S. Kipfstuhl et al., 2006, Journal of Glaciology, 52, 398-406]). Along the entire NEEM ice core (North-West Greenland, 2537 m length) drilled in 2008-2011 we applied both methods to the same set of vertical sections. The data set comprises series of six consecutive 6 x 9 cm2 sections in steps of 20 m – in total about 800 images. A dedicated method for automatic processing and matching both image types has recently been developed [T. Binder et al., 2013, Journal of Microscopy, 250, 130-141]. The high resolution properties of the grain boundary network are analyzed. Furthermore, the automatic assignment of c-axis misorientations to visible sublimation grooves enables us to quantify the degree of similarity between the microstructure revealed by both analysis techniques. The reliability to extract grain boundaries from both image types as well as the appearance of sublimation groove patterns exhibiting low misorientations is investigated. X-ray Laue diffraction measurements (yielding full crystallographic orientation) have validated the sensitivity of the surface sublimation method for sub-grain boundaries [I. Weikusat et al., 2011, Journal of Glaciology, 57, 111-120]. We introduce an approach for automatic extraction of sub-grain structures from sublimation ...
format Conference Object
author Binder, Tobias
Weikusat, Ilka
Garbe, Christoph S.
Svensson, Anders
Kipfstuhl, Sepp
spellingShingle Binder, Tobias
Weikusat, Ilka
Garbe, Christoph S.
Svensson, Anders
Kipfstuhl, Sepp
Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
author_facet Binder, Tobias
Weikusat, Ilka
Garbe, Christoph S.
Svensson, Anders
Kipfstuhl, Sepp
author_sort Binder, Tobias
title Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
title_short Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
title_full Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
title_fullStr Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
title_full_unstemmed Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy
title_sort properties of grain boundary networks in the neem ice core analyzed by combined transmission and reflection optical microscopy
publishDate 2014
url https://epic.awi.de/id/eprint/35486/
https://epic.awi.de/id/eprint/35486/1/EGU2014-12098.pdf
https://hdl.handle.net/10013/epic.43459
https://hdl.handle.net/10013/epic.43459.d001
genre Greenland
ice core
genre_facet Greenland
ice core
op_source EPIC3EGU General Assembly 2014, Vienna, 2014-04-27-2014-05-02
op_relation https://epic.awi.de/id/eprint/35486/1/EGU2014-12098.pdf
https://hdl.handle.net/10013/epic.43459.d001
Binder, T. , Weikusat, I. orcid:0000-0002-3023-6036 , Garbe, C. S. , Svensson, A. and Kipfstuhl, S. (2014) Properties of grain boundary networks in the NEEM ice core analyzed by combined transmission and reflection optical microscopy , EGU General Assembly 2014, Vienna, 27 April 2014 - 2 May 2014 . hdl:10013/epic.43459
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