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Force balance along an inland tributary and onset to Ice Stream D, West Antarctica
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| Zeitschriftentitel: | Journal of Glaciology |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Journal of Glaciology, 48, 2002, 160, S. 20-30 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. |
|---|---|
| author |
Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. |
| spellingShingle |
Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. Journal of Glaciology Force balance along an inland tributary and onset to Ice Stream D, West Antarctica Earth-Surface Processes |
| author_sort |
price, stephen f. |
| spelling |
Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756502781831539 <jats:title>Abstract</jats:title><jats:p>The transition from inland- to streaming-style ice flow near to and upstream from the onset to Ice Stream D, West Antarctica, is investigated using the force-balance technique. Basal drag provides the majority of the flow resistance over the study area but is substantially modified by non-local stress gradients. Lateral drag increases with distance downstream, balancing ∼50–100% of the driving stress at the onset. Longitudinal stress gradients (LSG) are also found to be significant, an observation that distinguishes ice flow in this region from the inland- and streaming-flow regimes that bound it, in which LSG are usually negligible. LSG decrease the spatial variability in basal drag and sliding speed and increase the area of the bed over which frictional melting occurs. Overall, LSG decrease the resistive influence of basal stress concentrations and increase the spatial uniformity of basal sliding. These observations suggest that streaming flow develops as an integrated response to the physical interaction between the ice and its bed over an extended region upstream from the onset, rather than being solely due to changes in basal characteristics at the onset. An implication is that non-steady-flow behavior upstream from the onset may ultimately propagate downstream and result in non-steady behavior at the onset.</jats:p> Force balance along an inland tributary and onset to Ice Stream D, West Antarctica Journal of Glaciology |
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| title |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_unstemmed |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_full |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_fullStr |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_full_unstemmed |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_short |
Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_sort |
force balance along an inland tributary and onset to ice stream d, west antarctica |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756502781831539 |
| publishDate |
2002 |
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20-30 |
| description |
<jats:title>Abstract</jats:title><jats:p>The transition from inland- to streaming-style ice flow near to and upstream from the onset to Ice Stream D, West Antarctica, is investigated using the force-balance technique. Basal drag provides the majority of the flow resistance over the study area but is substantially modified by non-local stress gradients. Lateral drag increases with distance downstream, balancing ∼50–100% of the driving stress at the onset. Longitudinal stress gradients (LSG) are also found to be significant, an observation that distinguishes ice flow in this region from the inland- and streaming-flow regimes that bound it, in which LSG are usually negligible. LSG decrease the spatial variability in basal drag and sliding speed and increase the area of the bed over which frictional melting occurs. Overall, LSG decrease the resistive influence of basal stress concentrations and increase the spatial uniformity of basal sliding. These observations suggest that streaming flow develops as an integrated response to the physical interaction between the ice and its bed over an extended region upstream from the onset, rather than being solely due to changes in basal characteristics at the onset. An implication is that non-steady-flow behavior upstream from the onset may ultimately propagate downstream and result in non-steady behavior at the onset.</jats:p> |
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| author | Price, Stephen F., Bindschadler, Robert A., Hulbe, Christina L., Blankenship, Donald D. |
| author_facet | Price, Stephen F., Bindschadler, Robert A., Hulbe, Christina L., Blankenship, Donald D., Price, Stephen F., Bindschadler, Robert A., Hulbe, Christina L., Blankenship, Donald D. |
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| description | <jats:title>Abstract</jats:title><jats:p>The transition from inland- to streaming-style ice flow near to and upstream from the onset to Ice Stream D, West Antarctica, is investigated using the force-balance technique. Basal drag provides the majority of the flow resistance over the study area but is substantially modified by non-local stress gradients. Lateral drag increases with distance downstream, balancing ∼50–100% of the driving stress at the onset. Longitudinal stress gradients (LSG) are also found to be significant, an observation that distinguishes ice flow in this region from the inland- and streaming-flow regimes that bound it, in which LSG are usually negligible. LSG decrease the spatial variability in basal drag and sliding speed and increase the area of the bed over which frictional melting occurs. Overall, LSG decrease the resistive influence of basal stress concentrations and increase the spatial uniformity of basal sliding. These observations suggest that streaming flow develops as an integrated response to the physical interaction between the ice and its bed over an extended region upstream from the onset, rather than being solely due to changes in basal characteristics at the onset. An implication is that non-steady-flow behavior upstream from the onset may ultimately propagate downstream and result in non-steady behavior at the onset.</jats:p> |
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| imprint_str_mv | International Glaciological Society, 2002 |
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| spelling | Price, Stephen F. Bindschadler, Robert A. Hulbe, Christina L. Blankenship, Donald D. 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756502781831539 <jats:title>Abstract</jats:title><jats:p>The transition from inland- to streaming-style ice flow near to and upstream from the onset to Ice Stream D, West Antarctica, is investigated using the force-balance technique. Basal drag provides the majority of the flow resistance over the study area but is substantially modified by non-local stress gradients. Lateral drag increases with distance downstream, balancing ∼50–100% of the driving stress at the onset. Longitudinal stress gradients (LSG) are also found to be significant, an observation that distinguishes ice flow in this region from the inland- and streaming-flow regimes that bound it, in which LSG are usually negligible. LSG decrease the spatial variability in basal drag and sliding speed and increase the area of the bed over which frictional melting occurs. Overall, LSG decrease the resistive influence of basal stress concentrations and increase the spatial uniformity of basal sliding. These observations suggest that streaming flow develops as an integrated response to the physical interaction between the ice and its bed over an extended region upstream from the onset, rather than being solely due to changes in basal characteristics at the onset. An implication is that non-steady-flow behavior upstream from the onset may ultimately propagate downstream and result in non-steady behavior at the onset.</jats:p> Force balance along an inland tributary and onset to Ice Stream D, West Antarctica Journal of Glaciology |
| spellingShingle | Price, Stephen F., Bindschadler, Robert A., Hulbe, Christina L., Blankenship, Donald D., Journal of Glaciology, Force balance along an inland tributary and onset to Ice Stream D, West Antarctica, Earth-Surface Processes |
| title | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_full | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_fullStr | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_full_unstemmed | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_short | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| title_sort | force balance along an inland tributary and onset to ice stream d, west antarctica |
| title_unstemmed | Force balance along an inland tributary and onset to Ice Stream D, West Antarctica |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756502781831539 |