Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014
ABSTRACT Repeat airborne laser altimetry measurements show widespread thinning (surface lowering) of glaciers in Canada's Queen Elizabeth Islands since 1995. Thinning rates averaged for 50 m elevation bins, were more than three times higher during the period 2005/06 to 2012/14 pentad than durin...
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Online Access: | http://dx.doi.org/10.1017/jog.2018.37 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000370 |
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crcambridgeupr:10.1017/jog.2018.37 2024-03-03T08:42:09+00:00 Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 MORTIMER, COLLEEN A. SHARP, MARTIN VAN WYCHEN, WESLEY 2018 http://dx.doi.org/10.1017/jog.2018.37 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000370 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 245, page 450-464 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.37 2024-02-08T08:32:26Z ABSTRACT Repeat airborne laser altimetry measurements show widespread thinning (surface lowering) of glaciers in Canada's Queen Elizabeth Islands since 1995. Thinning rates averaged for 50 m elevation bins, were more than three times higher during the period 2005/06 to 2012/14 pentad than during the previous two pentads. Strongly negative thickness change (d h /d t ) anomalies from 2005/06 to 2012/14, relative to the 1995–2012/14 mean, suggest that most of the measured thinning occurred during the most recent 5–6 year period when mean summer land surface temperatures (LSTs) were anomalously high and the mean summer black-sky shortwave broadband albedos (BSA) were anomalously low, relative to the 2000/01–15/16 period, and upper-air (700 hPa) and near surface (2 m) air temperatures were between 0.8°C and 1.5°C higher than 1995–2012 mean. Comparisons of d h /d t with mean summer LST and BSA measurements from the Moderate Resolution Imaging Spectroradiometer and with surface longitudinal strain rates computed from surface velocity fields derived from RADARSAT 1/2 and Landat-7 ETM + data suggest that surface elevation changes were driven mainly by changes in climate. An exception to this occurs along many fast-flowing outlet glaciers where ice dynamics appear also to have played an important role in surface elevation changes. Article in Journal/Newspaper Arctic Journal of Glaciology Queen Elizabeth Islands Cambridge University Press Arctic Journal of Glaciology 64 245 450 464 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes MORTIMER, COLLEEN A. SHARP, MARTIN VAN WYCHEN, WESLEY Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT Repeat airborne laser altimetry measurements show widespread thinning (surface lowering) of glaciers in Canada's Queen Elizabeth Islands since 1995. Thinning rates averaged for 50 m elevation bins, were more than three times higher during the period 2005/06 to 2012/14 pentad than during the previous two pentads. Strongly negative thickness change (d h /d t ) anomalies from 2005/06 to 2012/14, relative to the 1995–2012/14 mean, suggest that most of the measured thinning occurred during the most recent 5–6 year period when mean summer land surface temperatures (LSTs) were anomalously high and the mean summer black-sky shortwave broadband albedos (BSA) were anomalously low, relative to the 2000/01–15/16 period, and upper-air (700 hPa) and near surface (2 m) air temperatures were between 0.8°C and 1.5°C higher than 1995–2012 mean. Comparisons of d h /d t with mean summer LST and BSA measurements from the Moderate Resolution Imaging Spectroradiometer and with surface longitudinal strain rates computed from surface velocity fields derived from RADARSAT 1/2 and Landat-7 ETM + data suggest that surface elevation changes were driven mainly by changes in climate. An exception to this occurs along many fast-flowing outlet glaciers where ice dynamics appear also to have played an important role in surface elevation changes. |
format |
Article in Journal/Newspaper |
author |
MORTIMER, COLLEEN A. SHARP, MARTIN VAN WYCHEN, WESLEY |
author_facet |
MORTIMER, COLLEEN A. SHARP, MARTIN VAN WYCHEN, WESLEY |
author_sort |
MORTIMER, COLLEEN A. |
title |
Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
title_short |
Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
title_full |
Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
title_fullStr |
Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
title_full_unstemmed |
Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 |
title_sort |
influence of recent warming and ice dynamics on glacier surface elevations in the canadian high arctic, 1995–2014 |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.37 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000370 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Journal of Glaciology Queen Elizabeth Islands |
genre_facet |
Arctic Journal of Glaciology Queen Elizabeth Islands |
op_source |
Journal of Glaciology volume 64, issue 245, page 450-464 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.37 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
245 |
container_start_page |
450 |
op_container_end_page |
464 |
_version_ |
1792497627153039360 |