Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds
By matching of repeat optical satellite images it is now possible to investigate glacier dynamics within large regions of the world and also between regions to improve knowledge about glacier dynamics in space and time. In this study we investigate whether the negative glacier mass balance seen over...
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ftcopernicus:oai:publications.copernicus.org:tc13138 2023-05-15T13:09:36+02:00 Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds Heid, T. Kääb, A. 2018-09-27 application/pdf https://doi.org/10.5194/tc-6-467-2012 https://tc.copernicus.org/articles/6/467/2012/ eng eng doi:10.5194/tc-6-467-2012 https://tc.copernicus.org/articles/6/467/2012/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-6-467-2012 2020-07-20T16:25:51Z By matching of repeat optical satellite images it is now possible to investigate glacier dynamics within large regions of the world and also between regions to improve knowledge about glacier dynamics in space and time. In this study we investigate whether the negative glacier mass balance seen over large parts of the world has caused the glaciers to change their speeds. The studied regions are Pamir, Caucasus, Penny Ice Cap, Alaska Range and Patagonia. In addition we derive speed changes for Karakoram, a region assumed to have positive mass balance and that contains many surge-type glaciers. We find that the mapped glaciers in the five regions with negative mass balance have over the last decades decreased their velocity at an average rate per decade of: 43 % in the Pamir, 8 % in the Caucasus, 25 % on Penny Ice Cap, 11 % in the Alaska Range and 20 % in Patagonia. Glaciers in Karakoram have generally increased their speeds, but surging glaciers and glaciers with flow instabilities are most prominent in this area. Therefore the calculated average speed change is not representative for this area. Text alaska range glacier glaciers Ice cap Penny Ice Cap Alaska Copernicus Publications: E-Journals Patagonia Penny Ice Cap ENVELOPE(-66.214,-66.214,67.284,67.284) The Cryosphere 6 2 467 478 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
By matching of repeat optical satellite images it is now possible to investigate glacier dynamics within large regions of the world and also between regions to improve knowledge about glacier dynamics in space and time. In this study we investigate whether the negative glacier mass balance seen over large parts of the world has caused the glaciers to change their speeds. The studied regions are Pamir, Caucasus, Penny Ice Cap, Alaska Range and Patagonia. In addition we derive speed changes for Karakoram, a region assumed to have positive mass balance and that contains many surge-type glaciers. We find that the mapped glaciers in the five regions with negative mass balance have over the last decades decreased their velocity at an average rate per decade of: 43 % in the Pamir, 8 % in the Caucasus, 25 % on Penny Ice Cap, 11 % in the Alaska Range and 20 % in Patagonia. Glaciers in Karakoram have generally increased their speeds, but surging glaciers and glaciers with flow instabilities are most prominent in this area. Therefore the calculated average speed change is not representative for this area. |
format |
Text |
author |
Heid, T. Kääb, A. |
spellingShingle |
Heid, T. Kääb, A. Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
author_facet |
Heid, T. Kääb, A. |
author_sort |
Heid, T. |
title |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
title_short |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
title_full |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
title_fullStr |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
title_full_unstemmed |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
title_sort |
repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-6-467-2012 https://tc.copernicus.org/articles/6/467/2012/ |
long_lat |
ENVELOPE(-66.214,-66.214,67.284,67.284) |
geographic |
Patagonia Penny Ice Cap |
geographic_facet |
Patagonia Penny Ice Cap |
genre |
alaska range glacier glaciers Ice cap Penny Ice Cap Alaska |
genre_facet |
alaska range glacier glaciers Ice cap Penny Ice Cap Alaska |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-6-467-2012 https://tc.copernicus.org/articles/6/467/2012/ |
op_doi |
https://doi.org/10.5194/tc-6-467-2012 |
container_title |
The Cryosphere |
container_volume |
6 |
container_issue |
2 |
container_start_page |
467 |
op_container_end_page |
478 |
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1766189820566044672 |