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New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations
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| Zeitschriftentitel: | The Cryosphere |
|---|---|
| Personen und Körperschaften: | , , , , , , , , |
| In: | The Cryosphere, 14, 2020, 9, S. 2869-2882 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. |
|---|---|
| author |
Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. |
| spellingShingle |
Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. The Cryosphere New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations Earth-Surface Processes Water Science and Technology |
| author_sort |
jordan, tom a. |
| spelling |
Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. 1994-0424 Copernicus GmbH Earth-Surface Processes Water Science and Technology http://dx.doi.org/10.5194/tc-14-2869-2020 <jats:p>Abstract. Ice shelves play a critical role in the long-term stability of ice sheets through their buttressing effect. The underlying bathymetry and cavity thickness are key inputs for modelling future ice sheet evolution. However, direct observation of sub-ice-shelf bathymetry is time-consuming, logistically risky, and in some areas simply not possible. Here we use new compilations of airborne and marine gravity, radar depth sounding, and swath bathymetry to provide new estimates of sub-ice-shelf bathymetry outboard of the rapidly changing West Antarctic Thwaites Glacier and beneath the adjacent Dotson and Crosson ice shelves. This region is of special interest, as the low-lying inland reverse slope of the Thwaites Glacier system makes it vulnerable to marine ice sheet instability, with rapid grounding line retreat observed since 1993 suggesting this process may be underway. Our results confirm a major marine channel >800 m deep extends tens of kilometres to the front of Thwaites Glacier, while the adjacent ice shelves are underlain by more complex bathymetry. Comparison of our new bathymetry with ice shelf draft reveals that ice shelves formed since 1993 comprise a distinct population where the draft conforms closely to the underlying bathymetry, unlike the older ice shelves, which show a more uniform depth of the ice base. This indicates that despite rapid basal melting in some areas, these recently floated parts of the ice shelf are not yet in dynamic equilibrium with their retreated grounding line positions and the underlying ocean system, a factor which must be included in future models of this region's evolution. </jats:p> New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations The Cryosphere |
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| title |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_unstemmed |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_full |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_fullStr |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_full_unstemmed |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_short |
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_sort |
new gravity-derived bathymetry for the thwaites, crosson, and dotson ice shelves revealing two ice shelf populations |
| topic |
Earth-Surface Processes Water Science and Technology |
| url |
http://dx.doi.org/10.5194/tc-14-2869-2020 |
| publishDate |
2020 |
| physical |
2869-2882 |
| description |
<jats:p>Abstract. Ice shelves play a critical role in the long-term
stability of ice sheets through their buttressing effect. The underlying
bathymetry and cavity thickness are key inputs for modelling future ice
sheet evolution. However, direct observation of sub-ice-shelf bathymetry is
time-consuming, logistically risky, and in some areas simply not possible.
Here we use new compilations of airborne and marine gravity, radar depth
sounding, and swath bathymetry to provide new estimates of sub-ice-shelf
bathymetry outboard of the rapidly changing West Antarctic Thwaites Glacier
and beneath the adjacent Dotson and Crosson ice shelves. This region is of
special interest, as the low-lying inland reverse slope of the Thwaites
Glacier system makes it vulnerable to marine ice sheet instability, with
rapid grounding line retreat observed since 1993 suggesting this process may
be underway. Our results confirm a major marine channel >800 m
deep extends tens of kilometres to the front of Thwaites Glacier, while the
adjacent ice shelves are underlain by more complex bathymetry. Comparison of
our new bathymetry with ice shelf draft reveals that ice shelves formed
since 1993 comprise a distinct population where the draft conforms closely
to the underlying bathymetry, unlike the older ice shelves, which show a more
uniform depth of the ice base. This indicates that despite rapid basal
melting in some areas, these recently floated parts of the ice shelf are not
yet in dynamic equilibrium with their retreated grounding line positions and
the underlying ocean system, a factor which must be included in future
models of this region's evolution.
</jats:p> |
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| author | Jordan, Tom A., Porter, David, Tinto, Kirsty, Millan, Romain, Muto, Atsuhiro, Hogan, Kelly, Larter, Robert D., Graham, Alastair G. C., Paden, John D. |
| author_facet | Jordan, Tom A., Porter, David, Tinto, Kirsty, Millan, Romain, Muto, Atsuhiro, Hogan, Kelly, Larter, Robert D., Graham, Alastair G. C., Paden, John D., Jordan, Tom A., Porter, David, Tinto, Kirsty, Millan, Romain, Muto, Atsuhiro, Hogan, Kelly, Larter, Robert D., Graham, Alastair G. C., Paden, John D. |
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| description | <jats:p>Abstract. Ice shelves play a critical role in the long-term stability of ice sheets through their buttressing effect. The underlying bathymetry and cavity thickness are key inputs for modelling future ice sheet evolution. However, direct observation of sub-ice-shelf bathymetry is time-consuming, logistically risky, and in some areas simply not possible. Here we use new compilations of airborne and marine gravity, radar depth sounding, and swath bathymetry to provide new estimates of sub-ice-shelf bathymetry outboard of the rapidly changing West Antarctic Thwaites Glacier and beneath the adjacent Dotson and Crosson ice shelves. This region is of special interest, as the low-lying inland reverse slope of the Thwaites Glacier system makes it vulnerable to marine ice sheet instability, with rapid grounding line retreat observed since 1993 suggesting this process may be underway. Our results confirm a major marine channel >800 m deep extends tens of kilometres to the front of Thwaites Glacier, while the adjacent ice shelves are underlain by more complex bathymetry. Comparison of our new bathymetry with ice shelf draft reveals that ice shelves formed since 1993 comprise a distinct population where the draft conforms closely to the underlying bathymetry, unlike the older ice shelves, which show a more uniform depth of the ice base. This indicates that despite rapid basal melting in some areas, these recently floated parts of the ice shelf are not yet in dynamic equilibrium with their retreated grounding line positions and the underlying ocean system, a factor which must be included in future models of this region's evolution. </jats:p> |
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| spelling | Jordan, Tom A. Porter, David Tinto, Kirsty Millan, Romain Muto, Atsuhiro Hogan, Kelly Larter, Robert D. Graham, Alastair G. C. Paden, John D. 1994-0424 Copernicus GmbH Earth-Surface Processes Water Science and Technology http://dx.doi.org/10.5194/tc-14-2869-2020 <jats:p>Abstract. Ice shelves play a critical role in the long-term stability of ice sheets through their buttressing effect. The underlying bathymetry and cavity thickness are key inputs for modelling future ice sheet evolution. However, direct observation of sub-ice-shelf bathymetry is time-consuming, logistically risky, and in some areas simply not possible. Here we use new compilations of airborne and marine gravity, radar depth sounding, and swath bathymetry to provide new estimates of sub-ice-shelf bathymetry outboard of the rapidly changing West Antarctic Thwaites Glacier and beneath the adjacent Dotson and Crosson ice shelves. This region is of special interest, as the low-lying inland reverse slope of the Thwaites Glacier system makes it vulnerable to marine ice sheet instability, with rapid grounding line retreat observed since 1993 suggesting this process may be underway. Our results confirm a major marine channel >800 m deep extends tens of kilometres to the front of Thwaites Glacier, while the adjacent ice shelves are underlain by more complex bathymetry. Comparison of our new bathymetry with ice shelf draft reveals that ice shelves formed since 1993 comprise a distinct population where the draft conforms closely to the underlying bathymetry, unlike the older ice shelves, which show a more uniform depth of the ice base. This indicates that despite rapid basal melting in some areas, these recently floated parts of the ice shelf are not yet in dynamic equilibrium with their retreated grounding line positions and the underlying ocean system, a factor which must be included in future models of this region's evolution. </jats:p> New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations The Cryosphere |
| spellingShingle | Jordan, Tom A., Porter, David, Tinto, Kirsty, Millan, Romain, Muto, Atsuhiro, Hogan, Kelly, Larter, Robert D., Graham, Alastair G. C., Paden, John D., The Cryosphere, New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations, Earth-Surface Processes, Water Science and Technology |
| title | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_full | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_fullStr | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_full_unstemmed | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_short | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| title_sort | new gravity-derived bathymetry for the thwaites, crosson, and dotson ice shelves revealing two ice shelf populations |
| title_unstemmed | New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations |
| topic | Earth-Surface Processes, Water Science and Technology |
| url | http://dx.doi.org/10.5194/tc-14-2869-2020 |