Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska
We examine the spatial patterns of near-surface air temperature (Ta) over a melting glacier using a multi-annual dataset from McCall Glacier, Alaska. The dataset consists of a 10-year (2005–2014) meteorological record along the glacier centreline up to an upper glacier cirque, spanning an elevation...
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International Glaciological Society
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/416458 2023-05-15T15:08:59+02:00 Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Ben W. Pellicciotti, Francesca 2020-06 application/application/pdf https://hdl.handle.net/20.500.11850/416458 https://doi.org/10.3929/ethz-b-000416458 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.12 info:eu-repo/semantics/altIdentifier/wos/000531857800004 http://hdl.handle.net/20.500.11850/416458 doi:10.3929/ethz-b-000416458 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Glaciology, 66 (257) Glacier meteorology Melt-surface Arctic glaciology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/416458 https://doi.org/10.3929/ethz-b-000416458 https://doi.org/10.1017/jog.2020.12 2022-04-25T14:07:37Z We examine the spatial patterns of near-surface air temperature (Ta) over a melting glacier using a multi-annual dataset from McCall Glacier, Alaska. The dataset consists of a 10-year (2005–2014) meteorological record along the glacier centreline up to an upper glacier cirque, spanning an elevation difference of 900 m. We test the validity of on-glacier linear lapse rates, and a model that calculates Ta based on the influence of katabatic winds and other heat sources along the glacier flow line. During the coldest hours of each summer (10% of time), average lapse rates across the entire glacier range from −4.7 to −6.7°C km−1, with a strong relationship between Ta and elevation (R2 > 0.7). During warm conditions, Ta shows more complex, non-linear patterns that are better explained by the flow line-dependent model, reducing errors by up to 0.5°C compared with linear lapse rates, although more uncertainty might be associated with these observations due to occasionally poor sensor ventilation. We conclude that Ta spatial distribution can vary significantly from year to year, and from one glacier section to another. Importantly, extrapolations using linear lapse rates from the ablation zone might lead to large underestimations of Ta on the upper glacier areas. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Arctic glacier Journal of Glaciology Alaska ETH Zürich Research Collection Arctic McCall ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Glacier meteorology Melt-surface Arctic glaciology |
spellingShingle |
Glacier meteorology Melt-surface Arctic glaciology Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Ben W. Pellicciotti, Francesca Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
topic_facet |
Glacier meteorology Melt-surface Arctic glaciology |
description |
We examine the spatial patterns of near-surface air temperature (Ta) over a melting glacier using a multi-annual dataset from McCall Glacier, Alaska. The dataset consists of a 10-year (2005–2014) meteorological record along the glacier centreline up to an upper glacier cirque, spanning an elevation difference of 900 m. We test the validity of on-glacier linear lapse rates, and a model that calculates Ta based on the influence of katabatic winds and other heat sources along the glacier flow line. During the coldest hours of each summer (10% of time), average lapse rates across the entire glacier range from −4.7 to −6.7°C km−1, with a strong relationship between Ta and elevation (R2 > 0.7). During warm conditions, Ta shows more complex, non-linear patterns that are better explained by the flow line-dependent model, reducing errors by up to 0.5°C compared with linear lapse rates, although more uncertainty might be associated with these observations due to occasionally poor sensor ventilation. We conclude that Ta spatial distribution can vary significantly from year to year, and from one glacier section to another. Importantly, extrapolations using linear lapse rates from the ablation zone might lead to large underestimations of Ta on the upper glacier areas. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Ben W. Pellicciotti, Francesca |
author_facet |
Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Ben W. Pellicciotti, Francesca |
author_sort |
Troxler, Patrick |
title |
Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
title_short |
Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
title_full |
Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
title_fullStr |
Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
title_full_unstemmed |
Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
title_sort |
modelling spatial patterns of near-surface air temperature over a decade of melt seasons on mccall glacier, alaska |
publisher |
International Glaciological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/416458 https://doi.org/10.3929/ethz-b-000416458 |
long_lat |
ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
geographic |
Arctic McCall |
geographic_facet |
Arctic McCall |
genre |
Arctic glacier Journal of Glaciology Alaska |
genre_facet |
Arctic glacier Journal of Glaciology Alaska |
op_source |
Journal of Glaciology, 66 (257) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.12 info:eu-repo/semantics/altIdentifier/wos/000531857800004 http://hdl.handle.net/20.500.11850/416458 doi:10.3929/ethz-b-000416458 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/416458 https://doi.org/10.3929/ethz-b-000416458 https://doi.org/10.1017/jog.2020.12 |
_version_ |
1766340237033734144 |