Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009
We report changes in ice velocity of a 6.5 million km 2 region around South Pole encompassing the Filchner-Ronne and Ross Ice Shelves and a significant portion of the ice streams and glaciers that constitute their catchment areas. Using the first full interferometric synthetic aperture radar (InSAR)...
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2012
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Online Access: | https://escholarship.org/uc/item/8cz1s0m0 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt8cz1s0m0 2023-09-05T13:14:16+02:00 Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 Scheuchl, B Mouginot, J Rignot, E 1019 - 1030 2012-01-01 application/pdf https://escholarship.org/uc/item/8cz1s0m0 unknown eScholarship, University of California qt8cz1s0m0 https://escholarship.org/uc/item/8cz1s0m0 CC-BY The Cryosphere, vol 6, iss 5 Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences article 2012 ftcdlib 2023-08-21T18:04:15Z We report changes in ice velocity of a 6.5 million km 2 region around South Pole encompassing the Filchner-Ronne and Ross Ice Shelves and a significant portion of the ice streams and glaciers that constitute their catchment areas. Using the first full interferometric synthetic aperture radar (InSAR) coverage of the region completed in 2009 and partial coverage acquired in 1997, we processed the data to assemble a comprehensive map of ice speed changes between those two years. On the Ross Ice Shelf, our results confirm a continued deceleration of Mercer and Whillans Ice Streams with a 12-yr velocity difference of-'50 m yr-' 1 (-'16.7%) and-'100 m yr-' 1 (-'25.3%) at their grounding lines. The deceleration spreads 450 km upstream of the grounding line and more than 500 km onto the shelf, beyond what was previously known. Ross and Filchner Ice Shelves exhibit signs of pre-calving events, representing the largest observed changes, with an increase in speed in excess of +100 m yr-' 1 in 12 yr. Other changes in the Ross Ice Shelf region are less significant. The observed changes in glacier speed extend on the Ross Ice Shelf along the ice streams' flow lines. Most tributaries of the Filchner-Ronne Ice Shelf show a modest deceleration or no change between 1997 and 2009. Slessor Glacier shows a small deceleration over a large sector. No change is detected on the Bailey, Rutford, and Institute Ice Streams. On the Filchner Ice Shelf itself, ice decelerated rather uniformly with a 12-yr difference in speed of-'50 m yr-' 1, or-'5% of its ice front speed, which we attribute to a 12 km advance in its ice front position. Our results show that dynamic changes are present in the region. They highlight the need for continued observation of the area with a primary focus on the Siple Coast. The dynamic changes in Central Antarctica between 1997 and 2009 are generally second-order effects in comparison to losses on glaciers in the Bellingshausen and Amundsen Seas region and on the Antarctic Peninsula. We therefore conclude that the ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Slessor Glacier South pole South pole The Cryosphere University of California: eScholarship Antarctic The Antarctic Antarctic Peninsula Ross Ice Shelf South Pole Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Mercer ENVELOPE(65.647,65.647,-70.227,-70.227) Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) Slessor ENVELOPE(-64.967,-64.967,-66.517,-66.517) Slessor Glacier ENVELOPE(-26.000,-26.000,-79.833,-79.833) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences Scheuchl, B Mouginot, J Rignot, E Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
topic_facet |
Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
description |
We report changes in ice velocity of a 6.5 million km 2 region around South Pole encompassing the Filchner-Ronne and Ross Ice Shelves and a significant portion of the ice streams and glaciers that constitute their catchment areas. Using the first full interferometric synthetic aperture radar (InSAR) coverage of the region completed in 2009 and partial coverage acquired in 1997, we processed the data to assemble a comprehensive map of ice speed changes between those two years. On the Ross Ice Shelf, our results confirm a continued deceleration of Mercer and Whillans Ice Streams with a 12-yr velocity difference of-'50 m yr-' 1 (-'16.7%) and-'100 m yr-' 1 (-'25.3%) at their grounding lines. The deceleration spreads 450 km upstream of the grounding line and more than 500 km onto the shelf, beyond what was previously known. Ross and Filchner Ice Shelves exhibit signs of pre-calving events, representing the largest observed changes, with an increase in speed in excess of +100 m yr-' 1 in 12 yr. Other changes in the Ross Ice Shelf region are less significant. The observed changes in glacier speed extend on the Ross Ice Shelf along the ice streams' flow lines. Most tributaries of the Filchner-Ronne Ice Shelf show a modest deceleration or no change between 1997 and 2009. Slessor Glacier shows a small deceleration over a large sector. No change is detected on the Bailey, Rutford, and Institute Ice Streams. On the Filchner Ice Shelf itself, ice decelerated rather uniformly with a 12-yr difference in speed of-'50 m yr-' 1, or-'5% of its ice front speed, which we attribute to a 12 km advance in its ice front position. Our results show that dynamic changes are present in the region. They highlight the need for continued observation of the area with a primary focus on the Siple Coast. The dynamic changes in Central Antarctica between 1997 and 2009 are generally second-order effects in comparison to losses on glaciers in the Bellingshausen and Amundsen Seas region and on the Antarctic Peninsula. We therefore conclude that the ... |
format |
Article in Journal/Newspaper |
author |
Scheuchl, B Mouginot, J Rignot, E |
author_facet |
Scheuchl, B Mouginot, J Rignot, E |
author_sort |
Scheuchl, B |
title |
Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
title_short |
Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
title_full |
Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
title_fullStr |
Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
title_full_unstemmed |
Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009 |
title_sort |
ice velocity changes in the ross and ronne sectors observed using satellite radar data from 1997 and 2009 |
publisher |
eScholarship, University of California |
publishDate |
2012 |
url |
https://escholarship.org/uc/item/8cz1s0m0 |
op_coverage |
1019 - 1030 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(65.647,65.647,-70.227,-70.227) ENVELOPE(-64.250,-64.250,-84.450,-84.450) ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-40.000,-40.000,-79.000,-79.000) ENVELOPE(-155.000,-155.000,-82.000,-82.000) ENVELOPE(-64.967,-64.967,-66.517,-66.517) ENVELOPE(-26.000,-26.000,-79.833,-79.833) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Ross Ice Shelf South Pole Ronne Ice Shelf Siple Mercer Whillans Rutford Filchner Ice Shelf Siple Coast Slessor Slessor Glacier |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Ross Ice Shelf South Pole Ronne Ice Shelf Siple Mercer Whillans Rutford Filchner Ice Shelf Siple Coast Slessor Slessor Glacier |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Slessor Glacier South pole South pole The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Slessor Glacier South pole South pole The Cryosphere |
op_source |
The Cryosphere, vol 6, iss 5 |
op_relation |
qt8cz1s0m0 https://escholarship.org/uc/item/8cz1s0m0 |
op_rights |
CC-BY |
_version_ |
1776205269311684608 |