Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska
Brady Glacier, Alaska, is a large tidewater glacier that is beginning a period of substantial retreat. Examination of 27 Landsat and MODIS images from the period 2003–2011 indicates that Brady Glacier has a mean ELA (equilibrium line altitude) of 745 m and AAR (accumulation area ratio) of 0.40. The...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.372.9856 2023-05-15T16:20:19+02:00 Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska M. Pelto D. Capps J. J. Clague B. Pelto The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.372.9856 http://www.nichols.edu/departments/glacier/ESC2012.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.372.9856 http://www.nichols.edu/departments/glacier/ESC2012.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.nichols.edu/departments/glacier/ESC2012.pdf glacier retreat Glacier Bay equilibrium line altitude text ftciteseerx 2016-01-08T01:24:00Z Brady Glacier, Alaska, is a large tidewater glacier that is beginning a period of substantial retreat. Examination of 27 Landsat and MODIS images from the period 2003–2011 indicates that Brady Glacier has a mean ELA (equilibrium line altitude) of 745 m and AAR (accumulation area ratio) of 0.40. The zero balance ELA is 600 m and equilibrium AAR 0.65. The negative mass balance associated with the increased ELA has triggered thinning of 20–100 m over most of the glacier below the ELA from 1948 to 2010. The thinning has caused substantial retreat of seven calving distributary termini of the glacier. Thinning and retreat have led to an increase in the width of and water depth at the calving fronts. In contrast, the main terminus has undergone only minor retreat since 1948. In 2010 several small proglacial lakes were evident at the terminus. By 2000, a permanent outlet river issuing from Trick Lake had developed along the western glacier margin. Terminus lake development combined with continued mass losses will lead to expansion of the lakes at the main terminus and retreat by calving. The glacier bed is likely below sea level along the main axis of Brady Glacier to the glacier divide. Retreat of the main terminus in the lake will likely lead to a rapid calving retreat similar to Bear, Excelsior, Norris, Portage, and Yakutat glaciers. Text glacier glaciers Tidewater Yakutat Alaska Unknown Ela ENVELOPE(9.642,9.642,63.170,63.170) Glacier Bay Western Glacier ENVELOPE(-63.745,-63.745,58.887,58.887) |
institution |
Open Polar |
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Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
glacier retreat Glacier Bay equilibrium line altitude |
spellingShingle |
glacier retreat Glacier Bay equilibrium line altitude M. Pelto D. Capps J. J. Clague B. Pelto Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
topic_facet |
glacier retreat Glacier Bay equilibrium line altitude |
description |
Brady Glacier, Alaska, is a large tidewater glacier that is beginning a period of substantial retreat. Examination of 27 Landsat and MODIS images from the period 2003–2011 indicates that Brady Glacier has a mean ELA (equilibrium line altitude) of 745 m and AAR (accumulation area ratio) of 0.40. The zero balance ELA is 600 m and equilibrium AAR 0.65. The negative mass balance associated with the increased ELA has triggered thinning of 20–100 m over most of the glacier below the ELA from 1948 to 2010. The thinning has caused substantial retreat of seven calving distributary termini of the glacier. Thinning and retreat have led to an increase in the width of and water depth at the calving fronts. In contrast, the main terminus has undergone only minor retreat since 1948. In 2010 several small proglacial lakes were evident at the terminus. By 2000, a permanent outlet river issuing from Trick Lake had developed along the western glacier margin. Terminus lake development combined with continued mass losses will lead to expansion of the lakes at the main terminus and retreat by calving. The glacier bed is likely below sea level along the main axis of Brady Glacier to the glacier divide. Retreat of the main terminus in the lake will likely lead to a rapid calving retreat similar to Bear, Excelsior, Norris, Portage, and Yakutat glaciers. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
M. Pelto D. Capps J. J. Clague B. Pelto |
author_facet |
M. Pelto D. Capps J. J. Clague B. Pelto |
author_sort |
M. Pelto |
title |
Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
title_short |
Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
title_full |
Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
title_fullStr |
Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
title_full_unstemmed |
Rising ELA and Expanding Proglacial Lakes Lead to Initiation of Rapid Retreat of Brady Glacier, Alaska |
title_sort |
rising ela and expanding proglacial lakes lead to initiation of rapid retreat of brady glacier, alaska |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.372.9856 http://www.nichols.edu/departments/glacier/ESC2012.pdf |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(-63.745,-63.745,58.887,58.887) |
geographic |
Ela Glacier Bay Western Glacier |
geographic_facet |
Ela Glacier Bay Western Glacier |
genre |
glacier glaciers Tidewater Yakutat Alaska |
genre_facet |
glacier glaciers Tidewater Yakutat Alaska |
op_source |
http://www.nichols.edu/departments/glacier/ESC2012.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.372.9856 http://www.nichols.edu/departments/glacier/ESC2012.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766008217041633280 |