author_facet Jacobel, Robert W.
Robinson, Audrey E.
Bindschadler, Robert A.
Jacobel, Robert W.
Robinson, Audrey E.
Bindschadler, Robert A.
author Jacobel, Robert W.
Robinson, Audrey E.
Bindschadler, Robert A.
spellingShingle Jacobel, Robert W.
Robinson, Audrey E.
Bindschadler, Robert A.
Annals of Glaciology
Studies of the grounding-line location on Ice Streams D and E, Antarctica
Earth-Surface Processes
author_sort jacobel, robert w.
spelling Jacobel, Robert W. Robinson, Audrey E. Bindschadler, Robert A. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/1994aog20-1-39-42 <jats:p>Landsat Thematic Mapper (TM) images were used prior to the 1991–92 field season to infer the position of the grounding line at the mouths of Ice Streams D and E, West Antarctica. Our field plan for mass-balance studies was based on this determination, and thus the imagery played a central role in both the scientific and logistics planning. A radar profile along the flow direction was made across the inferred grounding line at one location, and ice-thickness measurements together with surface surveying enable us to compare the hydrostatic surface and the actual topography to determine the point at which the ice becomes grounded. The profile transits from floating to grounded ice at the same location as the grounding line inferred from the imagery. Changes in the radar-echo strength also occur at this location, giving further support to this interpretation. Tilt studies of the ice flexure caused by tidal variations at locations on either side of this grounding point give additional evidence that grounding is occurring close by. The combination of these three measurements therefore confirms the grounding-line location derived from the satellite imagery and supports the use of this technique to determine grounding.</jats:p> Studies of the grounding-line location on Ice Streams D and E, Antarctica Annals of Glaciology
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title Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_unstemmed Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_full Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_fullStr Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_full_unstemmed Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_short Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_sort studies of the grounding-line location on ice streams d and e, antarctica
topic Earth-Surface Processes
url http://dx.doi.org/10.3189/1994aog20-1-39-42
publishDate 1994
physical 39-42
description <jats:p>Landsat Thematic Mapper (TM) images were used prior to the 1991–92 field season to infer the position of the grounding line at the mouths of Ice Streams D and E, West Antarctica. Our field plan for mass-balance studies was based on this determination, and thus the imagery played a central role in both the scientific and logistics planning. A radar profile along the flow direction was made across the inferred grounding line at one location, and ice-thickness measurements together with surface surveying enable us to compare the hydrostatic surface and the actual topography to determine the point at which the ice becomes grounded. The profile transits from floating to grounded ice at the same location as the grounding line inferred from the imagery. Changes in the radar-echo strength also occur at this location, giving further support to this interpretation. Tilt studies of the ice flexure caused by tidal variations at locations on either side of this grounding point give additional evidence that grounding is occurring close by. The combination of these three measurements therefore confirms the grounding-line location derived from the satellite imagery and supports the use of this technique to determine grounding.</jats:p>
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author Jacobel, Robert W., Robinson, Audrey E., Bindschadler, Robert A.
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author_sort jacobel, robert w.
container_start_page 39
container_title Annals of Glaciology
container_volume 20
description <jats:p>Landsat Thematic Mapper (TM) images were used prior to the 1991–92 field season to infer the position of the grounding line at the mouths of Ice Streams D and E, West Antarctica. Our field plan for mass-balance studies was based on this determination, and thus the imagery played a central role in both the scientific and logistics planning. A radar profile along the flow direction was made across the inferred grounding line at one location, and ice-thickness measurements together with surface surveying enable us to compare the hydrostatic surface and the actual topography to determine the point at which the ice becomes grounded. The profile transits from floating to grounded ice at the same location as the grounding line inferred from the imagery. Changes in the radar-echo strength also occur at this location, giving further support to this interpretation. Tilt studies of the ice flexure caused by tidal variations at locations on either side of this grounding point give additional evidence that grounding is occurring close by. The combination of these three measurements therefore confirms the grounding-line location derived from the satellite imagery and supports the use of this technique to determine grounding.</jats:p>
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spelling Jacobel, Robert W. Robinson, Audrey E. Bindschadler, Robert A. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/1994aog20-1-39-42 <jats:p>Landsat Thematic Mapper (TM) images were used prior to the 1991–92 field season to infer the position of the grounding line at the mouths of Ice Streams D and E, West Antarctica. Our field plan for mass-balance studies was based on this determination, and thus the imagery played a central role in both the scientific and logistics planning. A radar profile along the flow direction was made across the inferred grounding line at one location, and ice-thickness measurements together with surface surveying enable us to compare the hydrostatic surface and the actual topography to determine the point at which the ice becomes grounded. The profile transits from floating to grounded ice at the same location as the grounding line inferred from the imagery. Changes in the radar-echo strength also occur at this location, giving further support to this interpretation. Tilt studies of the ice flexure caused by tidal variations at locations on either side of this grounding point give additional evidence that grounding is occurring close by. The combination of these three measurements therefore confirms the grounding-line location derived from the satellite imagery and supports the use of this technique to determine grounding.</jats:p> Studies of the grounding-line location on Ice Streams D and E, Antarctica Annals of Glaciology
spellingShingle Jacobel, Robert W., Robinson, Audrey E., Bindschadler, Robert A., Annals of Glaciology, Studies of the grounding-line location on Ice Streams D and E, Antarctica, Earth-Surface Processes
title Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_full Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_fullStr Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_full_unstemmed Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_short Studies of the grounding-line location on Ice Streams D and E, Antarctica
title_sort studies of the grounding-line location on ice streams d and e, antarctica
title_unstemmed Studies of the grounding-line location on Ice Streams D and E, Antarctica
topic Earth-Surface Processes
url http://dx.doi.org/10.3189/1994aog20-1-39-42