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Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica
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| Zeitschriftentitel: | Journal of Glaciology |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Journal of Glaciology, 54, 2008, 184, S. 41-48 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew |
|---|---|
| author |
Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew |
| spellingShingle |
Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew Journal of Glaciology Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica Earth-Surface Processes |
| author_sort |
vaughan, david g. |
| spelling |
Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/002214308784409125 <jats:title>Abstract</jats:title><jats:p>Rutford Ice Stream and Carlson Inlet are neighbouring glaciers in West Antarctica. Rutford Ice Stream flows at speeds greater than 350 m a<jats:sup>−1</jats:sup>, whereas Carlson Inlet, which has some similar dimensions and supports a similar driving stress, flows 10–50 times slower. We discuss a range of observations concerning Carlson Inlet, and conclude that there is good indirect evidence that it is a relict ice stream, which ceased streaming more than 240 years BP, but sufficiently recently that its surface morphology, basal water content and basal morphology still retain characteristics produced by streaming. An analysis of expected subglacial drainage pathways indicates that Carlson Inlet is not streaming because it is currently starved of subglacial water, which is currently directed beneath Rutford Ice Stream. This current state of water piracy by Rutford Ice Stream is, however, sensitive to minor thickness changes on the ice streams; a ∼120 m (<4%) thickening of Rutford Ice Stream would divert almost all the subglacial water in the system towards Carlson Inlet and could reactivate its flow. The result highlights the importance of subglacial drainage in controlling ice-stream evolution and the requirement for ice-sheet models to couple ice flow with subglacial drainage.</jats:p> Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica Journal of Glaciology |
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Journal of Glaciology |
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| title |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_unstemmed |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_full |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_fullStr |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_full_unstemmed |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_short |
Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_sort |
flow-switching and water piracy between rutford ice stream and carlson inlet, west antarctica |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/002214308784409125 |
| publishDate |
2008 |
| physical |
41-48 |
| description |
<jats:title>Abstract</jats:title><jats:p>Rutford Ice Stream and Carlson Inlet are neighbouring glaciers in West Antarctica. Rutford Ice Stream flows at speeds greater than 350 m a<jats:sup>−1</jats:sup>, whereas Carlson Inlet, which has some similar dimensions and supports a similar driving stress, flows 10–50 times slower. We discuss a range of observations concerning Carlson Inlet, and conclude that there is good indirect evidence that it is a relict ice stream, which ceased streaming more than 240 years BP, but sufficiently recently that its surface morphology, basal water content and basal morphology still retain characteristics produced by streaming. An analysis of expected subglacial drainage pathways indicates that Carlson Inlet is not streaming because it is currently starved of subglacial water, which is currently directed beneath Rutford Ice Stream. This current state of water piracy by Rutford Ice Stream is, however, sensitive to minor thickness changes on the ice streams; a ∼120 m (<4%) thickening of Rutford Ice Stream would divert almost all the subglacial water in the system towards Carlson Inlet and could reactivate its flow. The result highlights the importance of subglacial drainage in controlling ice-stream evolution and the requirement for ice-sheet models to couple ice flow with subglacial drainage.</jats:p> |
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| author | Vaughan, David G., Corr, Hugh F.J., Smith, Andy M., Pritchard, Hamish D., Shepherd, Andrew |
| author_facet | Vaughan, David G., Corr, Hugh F.J., Smith, Andy M., Pritchard, Hamish D., Shepherd, Andrew, Vaughan, David G., Corr, Hugh F.J., Smith, Andy M., Pritchard, Hamish D., Shepherd, Andrew |
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| description | <jats:title>Abstract</jats:title><jats:p>Rutford Ice Stream and Carlson Inlet are neighbouring glaciers in West Antarctica. Rutford Ice Stream flows at speeds greater than 350 m a<jats:sup>−1</jats:sup>, whereas Carlson Inlet, which has some similar dimensions and supports a similar driving stress, flows 10–50 times slower. We discuss a range of observations concerning Carlson Inlet, and conclude that there is good indirect evidence that it is a relict ice stream, which ceased streaming more than 240 years BP, but sufficiently recently that its surface morphology, basal water content and basal morphology still retain characteristics produced by streaming. An analysis of expected subglacial drainage pathways indicates that Carlson Inlet is not streaming because it is currently starved of subglacial water, which is currently directed beneath Rutford Ice Stream. This current state of water piracy by Rutford Ice Stream is, however, sensitive to minor thickness changes on the ice streams; a ∼120 m (<4%) thickening of Rutford Ice Stream would divert almost all the subglacial water in the system towards Carlson Inlet and could reactivate its flow. The result highlights the importance of subglacial drainage in controlling ice-stream evolution and the requirement for ice-sheet models to couple ice flow with subglacial drainage.</jats:p> |
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| spelling | Vaughan, David G. Corr, Hugh F.J. Smith, Andy M. Pritchard, Hamish D. Shepherd, Andrew 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/002214308784409125 <jats:title>Abstract</jats:title><jats:p>Rutford Ice Stream and Carlson Inlet are neighbouring glaciers in West Antarctica. Rutford Ice Stream flows at speeds greater than 350 m a<jats:sup>−1</jats:sup>, whereas Carlson Inlet, which has some similar dimensions and supports a similar driving stress, flows 10–50 times slower. We discuss a range of observations concerning Carlson Inlet, and conclude that there is good indirect evidence that it is a relict ice stream, which ceased streaming more than 240 years BP, but sufficiently recently that its surface morphology, basal water content and basal morphology still retain characteristics produced by streaming. An analysis of expected subglacial drainage pathways indicates that Carlson Inlet is not streaming because it is currently starved of subglacial water, which is currently directed beneath Rutford Ice Stream. This current state of water piracy by Rutford Ice Stream is, however, sensitive to minor thickness changes on the ice streams; a ∼120 m (<4%) thickening of Rutford Ice Stream would divert almost all the subglacial water in the system towards Carlson Inlet and could reactivate its flow. The result highlights the importance of subglacial drainage in controlling ice-stream evolution and the requirement for ice-sheet models to couple ice flow with subglacial drainage.</jats:p> Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica Journal of Glaciology |
| spellingShingle | Vaughan, David G., Corr, Hugh F.J., Smith, Andy M., Pritchard, Hamish D., Shepherd, Andrew, Journal of Glaciology, Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica, Earth-Surface Processes |
| title | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_full | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_fullStr | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_full_unstemmed | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_short | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| title_sort | flow-switching and water piracy between rutford ice stream and carlson inlet, west antarctica |
| title_unstemmed | Flow-switching and water piracy between Rutford Ice Stream and Carlson Inlet, West Antarctica |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/002214308784409125 |