Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data
Satellite altimetry and Gravity Recovery and Climate Experiment (GRACE) measurements have provided contemporary, but substantially different Antarctic ice sheet mass balance estimates. Altimetry provides no information about firn density while GRACE data is significantly impacted by poorly constrain...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://doi.org/10.1016/j.epsl.2011.12.040 http://ir.lib.ncku.edu.tw/handle/987654321/127381 http://ir.lib.ncku.edu.tw/bitstream/987654321/127381/-1/index.html |
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ftchengkunguniv:oai:ir.lib.ncku.edu.tw:987654321/127381 2023-05-15T13:23:54+02:00 Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data Lee, Hyongki Shum, C. K. Howat, Ian M. Monaghan, Andrew Ahn, Yushin Duan, Jianbin Guo, Jun-Yi Kuo, Chung-Yen Wang, Lei Department of Geomatics 2012-03-01 https://doi.org/10.1016/j.epsl.2011.12.040 http://ir.lib.ncku.edu.tw/handle/987654321/127381 http://ir.lib.ncku.edu.tw/bitstream/987654321/127381/-1/index.html Eng en_US eng Elsevier EARTH AND PLANETARY SCIENCE LETTERS, Vol. 321, pp. 74-80 Southwest Pacific seismic stratigraphy tectonism plate motion Reinga Basin subduction article 2012 ftchengkunguniv https://doi.org/10.1016/j.epsl.2011.12.040 2016-05-22T07:50:29Z Satellite altimetry and Gravity Recovery and Climate Experiment (GRACE) measurements have provided contemporary, but substantially different Antarctic ice sheet mass balance estimates. Altimetry provides no information about firn density while GRACE data is significantly impacted by poorly constrained glacial isostatic adjustment signals. Here, we combine Envisat radar altimetry and GRACE data over the Amundsen Sea (AS) sector, West Antarctica, to estimate the basin-wide averaged snow and firn column density over a seasonal time scale. Removing the firn variability signal from Envisat-observed ice-sheet elevation changes reveals more rapid dynamic thinning of underlying ice. We report that the net AS sector mass change rates are estimated to be -47 +/- 8 Gt yr(-1) between 2002 and 2006, and -80 +/- 4 Gt yr(-1) between2007 and 2009, equivalent to a sea level rise of 0.13 and 0.22 mm yr(-1), respectively. The acceleration is due to a combination of decreased snowfall accumulation (+ 13 Gt yr(-1) in 2002-2006, and 6 Gt yr(-1) in 2007-2009) and enhanced ice dynamic thinning (-60 +/- 10 Gt yr(-1) in 2002-2006, and -74 +/- 11 Gt yr(-1) in 2007-2009) after 2007. Because there is no significant snowfall trend over the past 21 yr (1989-2009) and an increase in ice flow speed (2003-2010), the accelerated mass loss is likely to continue. (C) 2011 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica National Cheng Kung University: NCKU Institutional Repository Antarctic West Antarctica Amundsen Sea Pacific Earth and Planetary Science Letters 321-322 74 80 |
institution |
Open Polar |
collection |
National Cheng Kung University: NCKU Institutional Repository |
op_collection_id |
ftchengkunguniv |
language |
English |
topic |
Southwest Pacific seismic stratigraphy tectonism plate motion Reinga Basin subduction |
spellingShingle |
Southwest Pacific seismic stratigraphy tectonism plate motion Reinga Basin subduction Lee, Hyongki Shum, C. K. Howat, Ian M. Monaghan, Andrew Ahn, Yushin Duan, Jianbin Guo, Jun-Yi Kuo, Chung-Yen Wang, Lei Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
topic_facet |
Southwest Pacific seismic stratigraphy tectonism plate motion Reinga Basin subduction |
description |
Satellite altimetry and Gravity Recovery and Climate Experiment (GRACE) measurements have provided contemporary, but substantially different Antarctic ice sheet mass balance estimates. Altimetry provides no information about firn density while GRACE data is significantly impacted by poorly constrained glacial isostatic adjustment signals. Here, we combine Envisat radar altimetry and GRACE data over the Amundsen Sea (AS) sector, West Antarctica, to estimate the basin-wide averaged snow and firn column density over a seasonal time scale. Removing the firn variability signal from Envisat-observed ice-sheet elevation changes reveals more rapid dynamic thinning of underlying ice. We report that the net AS sector mass change rates are estimated to be -47 +/- 8 Gt yr(-1) between 2002 and 2006, and -80 +/- 4 Gt yr(-1) between2007 and 2009, equivalent to a sea level rise of 0.13 and 0.22 mm yr(-1), respectively. The acceleration is due to a combination of decreased snowfall accumulation (+ 13 Gt yr(-1) in 2002-2006, and 6 Gt yr(-1) in 2007-2009) and enhanced ice dynamic thinning (-60 +/- 10 Gt yr(-1) in 2002-2006, and -74 +/- 11 Gt yr(-1) in 2007-2009) after 2007. Because there is no significant snowfall trend over the past 21 yr (1989-2009) and an increase in ice flow speed (2003-2010), the accelerated mass loss is likely to continue. (C) 2011 Elsevier B.V. All rights reserved. |
author2 |
Department of Geomatics |
format |
Article in Journal/Newspaper |
author |
Lee, Hyongki Shum, C. K. Howat, Ian M. Monaghan, Andrew Ahn, Yushin Duan, Jianbin Guo, Jun-Yi Kuo, Chung-Yen Wang, Lei |
author_facet |
Lee, Hyongki Shum, C. K. Howat, Ian M. Monaghan, Andrew Ahn, Yushin Duan, Jianbin Guo, Jun-Yi Kuo, Chung-Yen Wang, Lei |
author_sort |
Lee, Hyongki |
title |
Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
title_short |
Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
title_full |
Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
title_fullStr |
Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
title_full_unstemmed |
Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data |
title_sort |
continuously accelerating ice loss over amundsen sea catchment, west antarctica, revealed by integrating altimetry and grace data |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://doi.org/10.1016/j.epsl.2011.12.040 http://ir.lib.ncku.edu.tw/handle/987654321/127381 http://ir.lib.ncku.edu.tw/bitstream/987654321/127381/-1/index.html |
geographic |
Antarctic West Antarctica Amundsen Sea Pacific |
geographic_facet |
Antarctic West Antarctica Amundsen Sea Pacific |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_relation |
EARTH AND PLANETARY SCIENCE LETTERS, Vol. 321, pp. 74-80 |
op_doi |
https://doi.org/10.1016/j.epsl.2011.12.040 |
container_title |
Earth and Planetary Science Letters |
container_volume |
321-322 |
container_start_page |
74 |
op_container_end_page |
80 |
_version_ |
1766376223686000640 |