Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield
Abstract The Southern Patagonia Icefield (SPI) withdrawal in recent decades shows contrasting behaviours between adjacent basins. One of the basins with highest volumetric losses is located at northernmost SPI. We refer to Jorge Montt tidewater glacier (48 ° 30′S/73 ° 30′W, 445 km 2 in 2018), which...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/jog.2019.47 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000479 |
id |
crcambridgeupr:10.1017/jog.2019.47 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/jog.2019.47 2024-09-15T18:15:37+00:00 Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield Bown, Francisca Rivera, Andrés Pętlicki, Michał Bravo, Claudio Oberreuter, Jonathan Moffat, Carlos 2019 http://dx.doi.org/10.1017/jog.2019.47 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000479 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 65, issue 253, page 732-744 ISSN 0022-1430 1727-5652 journal-article 2019 crcambridgeupr https://doi.org/10.1017/jog.2019.47 2024-07-24T04:03:42Z Abstract The Southern Patagonia Icefield (SPI) withdrawal in recent decades shows contrasting behaviours between adjacent basins. One of the basins with highest volumetric losses is located at northernmost SPI. We refer to Jorge Montt tidewater glacier (48 ° 30′S/73 ° 30′W, 445 km 2 in 2018), which retreated 2.7 km between 2011 and 2018 and thinned at rates of up to 21 m a −1 over this period. Based on the retreat record, remote-sensing imagery, field data, a mass-balance model and a calving parameterisation, we attempted to differentiate climatic-induced changes (i.e. surface mass balance) and dynamic responses (i.e. calving fluxes). The surface mass balance reached −4.15 km 3 w.e. a −1 between 2012 and 2017. When frontal ablation is included, the net mass balance is −17.79 km 3 w.e. a −1 . This represents a change of trend compared with modelling estimations of positive surface mass balance prior to 2010. This shift is attributed to higher ablation rates given that accumulation is known to have increased between 1980 and 2015. The available evidence, therefore, indicates that frontal ablation is the main factor, supported by observed rates at Jorge Montt as high as 3.81 km 3 w.e. a −1 in 2015, with ice velocities peaking at 11 km a −1 . Article in Journal/Newspaper Journal of Glaciology Tidewater Cambridge University Press Journal of Glaciology 65 253 732 744 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The Southern Patagonia Icefield (SPI) withdrawal in recent decades shows contrasting behaviours between adjacent basins. One of the basins with highest volumetric losses is located at northernmost SPI. We refer to Jorge Montt tidewater glacier (48 ° 30′S/73 ° 30′W, 445 km 2 in 2018), which retreated 2.7 km between 2011 and 2018 and thinned at rates of up to 21 m a −1 over this period. Based on the retreat record, remote-sensing imagery, field data, a mass-balance model and a calving parameterisation, we attempted to differentiate climatic-induced changes (i.e. surface mass balance) and dynamic responses (i.e. calving fluxes). The surface mass balance reached −4.15 km 3 w.e. a −1 between 2012 and 2017. When frontal ablation is included, the net mass balance is −17.79 km 3 w.e. a −1 . This represents a change of trend compared with modelling estimations of positive surface mass balance prior to 2010. This shift is attributed to higher ablation rates given that accumulation is known to have increased between 1980 and 2015. The available evidence, therefore, indicates that frontal ablation is the main factor, supported by observed rates at Jorge Montt as high as 3.81 km 3 w.e. a −1 in 2015, with ice velocities peaking at 11 km a −1 . |
format |
Article in Journal/Newspaper |
author |
Bown, Francisca Rivera, Andrés Pętlicki, Michał Bravo, Claudio Oberreuter, Jonathan Moffat, Carlos |
spellingShingle |
Bown, Francisca Rivera, Andrés Pętlicki, Michał Bravo, Claudio Oberreuter, Jonathan Moffat, Carlos Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
author_facet |
Bown, Francisca Rivera, Andrés Pętlicki, Michał Bravo, Claudio Oberreuter, Jonathan Moffat, Carlos |
author_sort |
Bown, Francisca |
title |
Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
title_short |
Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
title_full |
Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
title_fullStr |
Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
title_full_unstemmed |
Recent ice dynamics and mass balance of Jorge Montt Glacier, Southern Patagonia Icefield |
title_sort |
recent ice dynamics and mass balance of jorge montt glacier, southern patagonia icefield |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1017/jog.2019.47 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000479 |
genre |
Journal of Glaciology Tidewater |
genre_facet |
Journal of Glaciology Tidewater |
op_source |
Journal of Glaciology volume 65, issue 253, page 732-744 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2019.47 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
253 |
container_start_page |
732 |
op_container_end_page |
744 |
_version_ |
1810453484574605312 |