Utility of late summer transient snowline migration rate on Taku Glacier, Alaska
On Taku Glacier, Alaska a combination of field observations of snow water equivalent (SWE) from snowpits and probing in the vicinity of the transient snowline (TSL) are used to quantify the mass balance gradient. The balance gradient derived from the TSL and SWE measured in snowpits at 1000 m from 1...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2011
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Online Access: | https://doi.org/10.5194/tc-5-1127-2011 http://www.the-cryosphere.net/5/1127/2011/tc-5-1127-2011.pdf https://doaj.org/article/05e4b8834e0341b48e26568c4ecc3919 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:05e4b8834e0341b48e26568c4ecc3919 2023-05-15T16:20:31+02:00 Utility of late summer transient snowline migration rate on Taku Glacier, Alaska M. Pelto 2011-12-01 https://doi.org/10.5194/tc-5-1127-2011 http://www.the-cryosphere.net/5/1127/2011/tc-5-1127-2011.pdf https://doaj.org/article/05e4b8834e0341b48e26568c4ecc3919 en eng Copernicus Publications doi:10.5194/tc-5-1127-2011 1994-0416 1994-0424 http://www.the-cryosphere.net/5/1127/2011/tc-5-1127-2011.pdf https://doaj.org/article/05e4b8834e0341b48e26568c4ecc3919 undefined The Cryosphere, Vol 5, Iss 4, Pp 1127-1133 (2011) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2011 fttriple https://doi.org/10.5194/tc-5-1127-2011 2023-01-22T18:19:40Z On Taku Glacier, Alaska a combination of field observations of snow water equivalent (SWE) from snowpits and probing in the vicinity of the transient snowline (TSL) are used to quantify the mass balance gradient. The balance gradient derived from the TSL and SWE measured in snowpits at 1000 m from 1998–2010 ranges from 2.6–3.8 mm m−1. Probing transects from 950 m–1100 m directly measure SWE and yield a slightly higher balance gradient of 3.3–3.8 mm m−1. The TSL on Taku Glacier is identified in MODIS and Landsat 4 and 7 Thematic Mapper images for 31 dates during the 2004–2010 period to assess the consistency of its rate of rise and reliability in assessing ablation for mass balance assessment. For example, in 2010, the TSL was 750 m on 28 July, 800 m on 5 August, 875 m on 14 August, 925 m on 30 August, and 975 m on 20 September. The mean observed probing balance gradient was 3.3 mm m−1, combined with the TSL rise of 3.7 m day−1 yields an ablation rate of 12.2 mm day−1 from mid-July to mid-Sept, 2010. The TSL rise in the region from 750–1100 m on Taku Glacier during eleven periods each covering more than 14 days during the ablation season indicates a mean TSL rise of 3.7 m day−1, the rate of rise is relatively consistent ranging from 3.1 to 4.4 m day−1. This rate is useful for ascertaining the final ELA if images or observations are not available near the end of the ablation season. The mean ablation from 750–1100 m during the July–September period determined from the TSL rise and the observed balance gradient is 11–13 mm day−1 on Taku Glacier during the 2004–2010 period. The potential for providing an estimate of bn from TSL observations late in the melt season from satellite images combined with the frequent availability of such images provides a means for efficient mass balance assessment in many years and on many glaciers. Article in Journal/Newspaper glacier glaciers The Cryosphere Alaska Unknown Ela ENVELOPE(9.642,9.642,63.170,63.170) Taku ENVELOPE(-133.854,-133.854,59.633,59.633) The Cryosphere 5 4 1127 1133 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir M. Pelto Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
topic_facet |
geo envir |
description |
On Taku Glacier, Alaska a combination of field observations of snow water equivalent (SWE) from snowpits and probing in the vicinity of the transient snowline (TSL) are used to quantify the mass balance gradient. The balance gradient derived from the TSL and SWE measured in snowpits at 1000 m from 1998–2010 ranges from 2.6–3.8 mm m−1. Probing transects from 950 m–1100 m directly measure SWE and yield a slightly higher balance gradient of 3.3–3.8 mm m−1. The TSL on Taku Glacier is identified in MODIS and Landsat 4 and 7 Thematic Mapper images for 31 dates during the 2004–2010 period to assess the consistency of its rate of rise and reliability in assessing ablation for mass balance assessment. For example, in 2010, the TSL was 750 m on 28 July, 800 m on 5 August, 875 m on 14 August, 925 m on 30 August, and 975 m on 20 September. The mean observed probing balance gradient was 3.3 mm m−1, combined with the TSL rise of 3.7 m day−1 yields an ablation rate of 12.2 mm day−1 from mid-July to mid-Sept, 2010. The TSL rise in the region from 750–1100 m on Taku Glacier during eleven periods each covering more than 14 days during the ablation season indicates a mean TSL rise of 3.7 m day−1, the rate of rise is relatively consistent ranging from 3.1 to 4.4 m day−1. This rate is useful for ascertaining the final ELA if images or observations are not available near the end of the ablation season. The mean ablation from 750–1100 m during the July–September period determined from the TSL rise and the observed balance gradient is 11–13 mm day−1 on Taku Glacier during the 2004–2010 period. The potential for providing an estimate of bn from TSL observations late in the melt season from satellite images combined with the frequent availability of such images provides a means for efficient mass balance assessment in many years and on many glaciers. |
format |
Article in Journal/Newspaper |
author |
M. Pelto |
author_facet |
M. Pelto |
author_sort |
M. Pelto |
title |
Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
title_short |
Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
title_full |
Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
title_fullStr |
Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
title_full_unstemmed |
Utility of late summer transient snowline migration rate on Taku Glacier, Alaska |
title_sort |
utility of late summer transient snowline migration rate on taku glacier, alaska |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/tc-5-1127-2011 http://www.the-cryosphere.net/5/1127/2011/tc-5-1127-2011.pdf https://doaj.org/article/05e4b8834e0341b48e26568c4ecc3919 |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(-133.854,-133.854,59.633,59.633) |
geographic |
Ela Taku |
geographic_facet |
Ela Taku |
genre |
glacier glaciers The Cryosphere Alaska |
genre_facet |
glacier glaciers The Cryosphere Alaska |
op_source |
The Cryosphere, Vol 5, Iss 4, Pp 1127-1133 (2011) |
op_relation |
doi:10.5194/tc-5-1127-2011 1994-0416 1994-0424 http://www.the-cryosphere.net/5/1127/2011/tc-5-1127-2011.pdf https://doaj.org/article/05e4b8834e0341b48e26568c4ecc3919 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-5-1127-2011 |
container_title |
The Cryosphere |
container_volume |
5 |
container_issue |
4 |
container_start_page |
1127 |
op_container_end_page |
1133 |
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1766008435207307264 |