Estimating equilibrium-line altitude (ELA) from glacier inventory data
A glacier's most fundamental altitude is the equilibrium-line altitude (ELA) because it divides the glacier into ablation and accumulation areas. The best parameterization of the ELA for glacier inventory is the balanced-budget ELA. We discuss direct estimation of balanced-budget ELA from mass-...
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ftumanchesterpub:oai:pure.atira.dk:publications/79fd8040-295b-48b6-8ada-dcd6afea775d 2023-11-12T04:01:21+01:00 Estimating equilibrium-line altitude (ELA) from glacier inventory data Braithwaite, R. J. Raper, S. C B 2009 application/octet-stream https://research.manchester.ac.uk/en/publications/79fd8040-295b-48b6-8ada-dcd6afea775d https://pure.manchester.ac.uk/ws/files/27671273/POST-PEER-REVIEW-PUBLISHERS.PDF eng eng info:eu-repo/semantics/openAccess Braithwaite , R J & Raper , S C B 2009 , ' Estimating equilibrium-line altitude (ELA) from glacier inventory data ' , Annals of Glaciology , vol. 50 , no. 53 , pp. 127-132 . article 2009 ftumanchesterpub 2023-10-30T09:14:37Z A glacier's most fundamental altitude is the equilibrium-line altitude (ELA) because it divides the glacier into ablation and accumulation areas. The best parameterization of the ELA for glacier inventory is the balanced-budget ELA. We discuss direct estimation of balanced-budget ELA from mass-balance data for individual glaciers, and indirect estimation of balanced-budget ELA from simple topographic parameters available from the World Glacier Inventory (WGI), i.e. the area-median and maximum and minimum altitudes. Mass balance and ELA for individual glaciers are usually strongly correlated and we calculate balanced-budget ELA from the regression equation linking the two. We then compare balanced-budget ELA with area-median and mid-range altitudes for the 94 glaciers for which we have all the necessary data. The different ELA estimates agree well enough (±82 to ±125m) to describe geographical variations in ELA and for application of glacier-climate models to glacier inventory data. Mid-range and area-median altitudes are already available for tens of thousands of glaciers in the current WGI and should be evaluated in future inventories. Article in Journal/Newspaper Annals of Glaciology The University of Manchester: Research Explorer Ela ENVELOPE(9.642,9.642,63.170,63.170) |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
description |
A glacier's most fundamental altitude is the equilibrium-line altitude (ELA) because it divides the glacier into ablation and accumulation areas. The best parameterization of the ELA for glacier inventory is the balanced-budget ELA. We discuss direct estimation of balanced-budget ELA from mass-balance data for individual glaciers, and indirect estimation of balanced-budget ELA from simple topographic parameters available from the World Glacier Inventory (WGI), i.e. the area-median and maximum and minimum altitudes. Mass balance and ELA for individual glaciers are usually strongly correlated and we calculate balanced-budget ELA from the regression equation linking the two. We then compare balanced-budget ELA with area-median and mid-range altitudes for the 94 glaciers for which we have all the necessary data. The different ELA estimates agree well enough (±82 to ±125m) to describe geographical variations in ELA and for application of glacier-climate models to glacier inventory data. Mid-range and area-median altitudes are already available for tens of thousands of glaciers in the current WGI and should be evaluated in future inventories. |
format |
Article in Journal/Newspaper |
author |
Braithwaite, R. J. Raper, S. C B |
spellingShingle |
Braithwaite, R. J. Raper, S. C B Estimating equilibrium-line altitude (ELA) from glacier inventory data |
author_facet |
Braithwaite, R. J. Raper, S. C B |
author_sort |
Braithwaite, R. J. |
title |
Estimating equilibrium-line altitude (ELA) from glacier inventory data |
title_short |
Estimating equilibrium-line altitude (ELA) from glacier inventory data |
title_full |
Estimating equilibrium-line altitude (ELA) from glacier inventory data |
title_fullStr |
Estimating equilibrium-line altitude (ELA) from glacier inventory data |
title_full_unstemmed |
Estimating equilibrium-line altitude (ELA) from glacier inventory data |
title_sort |
estimating equilibrium-line altitude (ela) from glacier inventory data |
publishDate |
2009 |
url |
https://research.manchester.ac.uk/en/publications/79fd8040-295b-48b6-8ada-dcd6afea775d https://pure.manchester.ac.uk/ws/files/27671273/POST-PEER-REVIEW-PUBLISHERS.PDF |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) |
geographic |
Ela |
geographic_facet |
Ela |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Braithwaite , R J & Raper , S C B 2009 , ' Estimating equilibrium-line altitude (ELA) from glacier inventory data ' , Annals of Glaciology , vol. 50 , no. 53 , pp. 127-132 . |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1782332359447674880 |