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...
Published in: | Journal of Glaciology |
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Cambridge University Press
2020
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/43686/ https://doi.org/10.1017/jog.2020.12 https://nrl.northumbria.ac.uk/id/eprint/43686/1/modelling_spatial_patterns_of_nearsurface_air_temperature_over_a_decade_of_melt_seasons_on_mccall_glacier_alaska.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:43686 2023-05-15T16:20:19+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, Benjamin Pellicciotti, Francesca 2020-06-01 text https://nrl.northumbria.ac.uk/id/eprint/43686/ https://doi.org/10.1017/jog.2020.12 https://nrl.northumbria.ac.uk/id/eprint/43686/1/modelling_spatial_patterns_of_nearsurface_air_temperature_over_a_decade_of_melt_seasons_on_mccall_glacier_alaska.pdf en eng Cambridge University Press https://nrl.northumbria.ac.uk/id/eprint/43686/1/modelling_spatial_patterns_of_nearsurface_air_temperature_over_a_decade_of_melt_seasons_on_mccall_glacier_alaska.pdf Troxler, Patrick, Ayala, Alvaro, Shaw, Thomas E., Nolan, Matt, Brock, Benjamin and Pellicciotti, Francesca (2020) Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska. Journal of Glaciology, 66 (257). pp. 386-400. ISSN 0022-1430 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2020 ftunivnorthumb https://doi.org/10.1017/jog.2020.12 2022-09-25T06:12:20Z 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. Article in Journal/Newspaper glacier Journal of Glaciology Alaska Northumbria University, Newcastle: Northumbria Research Link (NRL) McCall ENVELOPE(-66.619,-66.619,-67.029,-67.029) Journal of Glaciology 66 257 386 400 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Benjamin Pellicciotti, Francesca Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
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. |
format |
Article in Journal/Newspaper |
author |
Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Benjamin Pellicciotti, Francesca |
author_facet |
Troxler, Patrick Ayala, Alvaro Shaw, Thomas E. Nolan, Matt Brock, Benjamin 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 |
Cambridge University Press |
publishDate |
2020 |
url |
https://nrl.northumbria.ac.uk/id/eprint/43686/ https://doi.org/10.1017/jog.2020.12 https://nrl.northumbria.ac.uk/id/eprint/43686/1/modelling_spatial_patterns_of_nearsurface_air_temperature_over_a_decade_of_melt_seasons_on_mccall_glacier_alaska.pdf |
long_lat |
ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
geographic |
McCall |
geographic_facet |
McCall |
genre |
glacier Journal of Glaciology Alaska |
genre_facet |
glacier Journal of Glaciology Alaska |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/43686/1/modelling_spatial_patterns_of_nearsurface_air_temperature_over_a_decade_of_melt_seasons_on_mccall_glacier_alaska.pdf Troxler, Patrick, Ayala, Alvaro, Shaw, Thomas E., Nolan, Matt, Brock, Benjamin and Pellicciotti, Francesca (2020) Modelling spatial patterns of near-surface air temperature over a decade of melt seasons on McCall Glacier, Alaska. Journal of Glaciology, 66 (257). pp. 386-400. ISSN 0022-1430 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2020.12 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
257 |
container_start_page |
386 |
op_container_end_page |
400 |
_version_ |
1766008223233474560 |