Three-dimensional flow influences on radar layer stratigraphy
Variations in the depth of radar-detectable englacial layers (isochrones) are commonly used to assess past variability in accumulation rates, but little is known about the effect of internal and basal flow variations on isochrone deflections (e.g. bumps, troughs). In this paper, we show how the isoc...
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International Glaciological Society
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ftunivzuerich:oai:www.zora.uzh.ch:139521 2024-09-30T14:22:47+00:00 Three-dimensional flow influences on radar layer stratigraphy Leysinger Vieli, Gwendolyn Hindmarsh, Richard C A Siegert, Martin J 2007 application/pdf https://www.zora.uzh.ch/id/eprint/139521/ https://www.zora.uzh.ch/id/eprint/139521/1/2007_Leysinger_a46a162.pdf https://www.igsoc.org/annals/46/a46a162.pdf https://doi.org/10.5167/uzh-139521 https://doi.org/10.3189/172756407782871729 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/139521/1/2007_Leysinger_a46a162.pdf doi:10.5167/uzh-139521 doi:10.3189/172756407782871729 urn:issn:0260-3055 info:eu-repo/semantics/closedAccess Leysinger Vieli, Gwendolyn; Hindmarsh, Richard C A; Siegert, Martin J (2007). Three-dimensional flow influences on radar layer stratigraphy. Annals of Glaciology, 46:22-28. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2007 ftunivzuerich https://doi.org/10.5167/uzh-13952110.3189/172756407782871729 2024-09-18T00:49:48Z Variations in the depth of radar-detectable englacial layers (isochrones) are commonly used to assess past variability in accumulation rates, but little is known about the effect of internal and basal flow variations on isochrone deflections (e.g. bumps, troughs). In this paper, we show how the isochrones are affected by such variation using a three-dimensional flow model to investigate changes in the flow mode and in increased basal melting. We also investigate how transverse flows with lateral velocity gradients affect the development of isochrones. We use the model to visualize how such variations will be seen in radar lines which cross the flow direction. We show that in the presence of lateral gradients in the flow field we can produce bumps and troughs when viewed along transects perpendicular to the flow. The model results show that the influences of flow convergence, melting and changes in flow mode, when coupled together, affect isochrones over the whole depth of the ice sheet. Finally, changes in the near-surface layers cannot be solely attributed to spatial variation in the accumulation rate; there can also be a strong signal from changes in the flow mode. Article in Journal/Newspaper Annals of Glaciology Ice Sheet University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Leysinger Vieli, Gwendolyn Hindmarsh, Richard C A Siegert, Martin J Three-dimensional flow influences on radar layer stratigraphy |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
Variations in the depth of radar-detectable englacial layers (isochrones) are commonly used to assess past variability in accumulation rates, but little is known about the effect of internal and basal flow variations on isochrone deflections (e.g. bumps, troughs). In this paper, we show how the isochrones are affected by such variation using a three-dimensional flow model to investigate changes in the flow mode and in increased basal melting. We also investigate how transverse flows with lateral velocity gradients affect the development of isochrones. We use the model to visualize how such variations will be seen in radar lines which cross the flow direction. We show that in the presence of lateral gradients in the flow field we can produce bumps and troughs when viewed along transects perpendicular to the flow. The model results show that the influences of flow convergence, melting and changes in flow mode, when coupled together, affect isochrones over the whole depth of the ice sheet. Finally, changes in the near-surface layers cannot be solely attributed to spatial variation in the accumulation rate; there can also be a strong signal from changes in the flow mode. |
format |
Article in Journal/Newspaper |
author |
Leysinger Vieli, Gwendolyn Hindmarsh, Richard C A Siegert, Martin J |
author_facet |
Leysinger Vieli, Gwendolyn Hindmarsh, Richard C A Siegert, Martin J |
author_sort |
Leysinger Vieli, Gwendolyn |
title |
Three-dimensional flow influences on radar layer stratigraphy |
title_short |
Three-dimensional flow influences on radar layer stratigraphy |
title_full |
Three-dimensional flow influences on radar layer stratigraphy |
title_fullStr |
Three-dimensional flow influences on radar layer stratigraphy |
title_full_unstemmed |
Three-dimensional flow influences on radar layer stratigraphy |
title_sort |
three-dimensional flow influences on radar layer stratigraphy |
publisher |
International Glaciological Society |
publishDate |
2007 |
url |
https://www.zora.uzh.ch/id/eprint/139521/ https://www.zora.uzh.ch/id/eprint/139521/1/2007_Leysinger_a46a162.pdf https://www.igsoc.org/annals/46/a46a162.pdf https://doi.org/10.5167/uzh-139521 https://doi.org/10.3189/172756407782871729 |
genre |
Annals of Glaciology Ice Sheet |
genre_facet |
Annals of Glaciology Ice Sheet |
op_source |
Leysinger Vieli, Gwendolyn; Hindmarsh, Richard C A; Siegert, Martin J (2007). Three-dimensional flow influences on radar layer stratigraphy. Annals of Glaciology, 46:22-28. |
op_relation |
https://www.zora.uzh.ch/id/eprint/139521/1/2007_Leysinger_a46a162.pdf doi:10.5167/uzh-139521 doi:10.3189/172756407782871729 urn:issn:0260-3055 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.5167/uzh-13952110.3189/172756407782871729 |
_version_ |
1811635544600346624 |