External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010
The Mertz Glacier Tongue (MGT) in East Antarctica lost ~55% of its floating length in February 2010, when it calved large tabular iceberg C28 (78 × 35 km). We analyze the behavior of the MGT over the preceding 12 years using a variety of satellite data (synthetic aperture radar and Landsat imagery a...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/14317 2024-01-14T10:00:06+01:00 External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 Massom, Robert A. Giles, A. Barry Warner, Roland C. Fricker, Helen A. Legrésy, Benoit Hyland, Glenn Lescarmontier, Lydie Young, Neal http://hdl.handle.net/1885/14317 https://doi.org/10.1002/2014JF003223 unknown Wiley 2169-9003 http://hdl.handle.net/1885/14317 doi:10.1002/2014JF003223 © 2015. Australian Antarctic Division, Commonwealth of Australia Journal of Geophysical Research: Earth Surface Journal article ftanucanberra https://doi.org/10.1002/2014JF003223 2023-12-15T09:34:42Z The Mertz Glacier Tongue (MGT) in East Antarctica lost ~55% of its floating length in February 2010, when it calved large tabular iceberg C28 (78 × 35 km). We analyze the behavior of the MGT over the preceding 12 years using a variety of satellite data (synthetic aperture radar and Landsat imagery and Ice, Cloud, and land Elevation Satellite laser altimetry). Contact of its northwestern tip with the eastern flank of shoals from 2002/2003 caused eastward deflection of the ice flow by up to ~47°. This change contributed to opening of a major rift system ~80 km to the south, along which iceberg C28 eventually calved. Paradoxically, the seabed contact may have also held the glacier tongue in place to delay calving by ~8 years. Our study also reveals the effects of other, more localized external influences on the MGT prior to calving. These include an abrupt sideways displacement of the glacier tongue front by at least ~145 m following an apparent collision with iceberg C08 in early 2002 and calving of numerous small icebergs from the advancing northwestern front due to the "chiseling" action of small grounded icebergs and seabed contact, resulting in the loss of ~36 km2 of ice from 2001 to 2006. The example of the MGT confirms the need for accurate bathymetry in the vicinity of ice shelves and glacier tongues and suggests that the cumulative effect of external factors might be critical to understanding and modeling calving events and ice shelf stability, necessarily on a case-specific basis. This work was supported by the Australian Government’s Cooperative Research Centre (CRC) program through the Antarctic Climate & Ecosystems CRC, and Australian Antarctic Science Projects 3024 and 4116 and contributes to WCRP Climate and Cryosphere (CliC) project Targeted Activity Interactions Between Cryosphere Elements. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Iceberg* Mertz Glacier Australian National University: ANU Digital Collections Antarctic The Antarctic East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Mertz Glacier Tongue ENVELOPE(145.500,145.500,-67.167,-67.167) Journal of Geophysical Research: Earth Surface 120 3 490 506 |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
unknown |
description |
The Mertz Glacier Tongue (MGT) in East Antarctica lost ~55% of its floating length in February 2010, when it calved large tabular iceberg C28 (78 × 35 km). We analyze the behavior of the MGT over the preceding 12 years using a variety of satellite data (synthetic aperture radar and Landsat imagery and Ice, Cloud, and land Elevation Satellite laser altimetry). Contact of its northwestern tip with the eastern flank of shoals from 2002/2003 caused eastward deflection of the ice flow by up to ~47°. This change contributed to opening of a major rift system ~80 km to the south, along which iceberg C28 eventually calved. Paradoxically, the seabed contact may have also held the glacier tongue in place to delay calving by ~8 years. Our study also reveals the effects of other, more localized external influences on the MGT prior to calving. These include an abrupt sideways displacement of the glacier tongue front by at least ~145 m following an apparent collision with iceberg C08 in early 2002 and calving of numerous small icebergs from the advancing northwestern front due to the "chiseling" action of small grounded icebergs and seabed contact, resulting in the loss of ~36 km2 of ice from 2001 to 2006. The example of the MGT confirms the need for accurate bathymetry in the vicinity of ice shelves and glacier tongues and suggests that the cumulative effect of external factors might be critical to understanding and modeling calving events and ice shelf stability, necessarily on a case-specific basis. This work was supported by the Australian Government’s Cooperative Research Centre (CRC) program through the Antarctic Climate & Ecosystems CRC, and Australian Antarctic Science Projects 3024 and 4116 and contributes to WCRP Climate and Cryosphere (CliC) project Targeted Activity Interactions Between Cryosphere Elements. |
format |
Article in Journal/Newspaper |
author |
Massom, Robert A. Giles, A. Barry Warner, Roland C. Fricker, Helen A. Legrésy, Benoit Hyland, Glenn Lescarmontier, Lydie Young, Neal |
spellingShingle |
Massom, Robert A. Giles, A. Barry Warner, Roland C. Fricker, Helen A. Legrésy, Benoit Hyland, Glenn Lescarmontier, Lydie Young, Neal External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
author_facet |
Massom, Robert A. Giles, A. Barry Warner, Roland C. Fricker, Helen A. Legrésy, Benoit Hyland, Glenn Lescarmontier, Lydie Young, Neal |
author_sort |
Massom, Robert A. |
title |
External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
title_short |
External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
title_full |
External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
title_fullStr |
External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
title_full_unstemmed |
External influences on the Mertz Glacier Tongue (East Antarctica) in the decade leading up to its calving in 2010 |
title_sort |
external influences on the mertz glacier tongue (east antarctica) in the decade leading up to its calving in 2010 |
publisher |
Wiley |
url |
http://hdl.handle.net/1885/14317 https://doi.org/10.1002/2014JF003223 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(145.500,145.500,-67.167,-67.167) |
geographic |
Antarctic The Antarctic East Antarctica Mertz Glacier Mertz Glacier Tongue |
geographic_facet |
Antarctic The Antarctic East Antarctica Mertz Glacier Mertz Glacier Tongue |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Iceberg* Mertz Glacier |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Iceberg* Mertz Glacier |
op_source |
Journal of Geophysical Research: Earth Surface |
op_relation |
2169-9003 http://hdl.handle.net/1885/14317 doi:10.1002/2014JF003223 |
op_rights |
© 2015. Australian Antarctic Division, Commonwealth of Australia |
op_doi |
https://doi.org/10.1002/2014JF003223 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
120 |
container_issue |
3 |
container_start_page |
490 |
op_container_end_page |
506 |
_version_ |
1788063480659574784 |