Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic)
The Antarctic Peninsula (AP) region has been one of the regions on Earth with strongest warming since 1950. However, the northwest of the AP showed a cooling from 2000 to 2015, which had local consequences with an increase in snow accumulation and a deceleration in the loss of mass from glaciers. In...
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Online Access: | http://hdl.handle.net/10451/45580 https://doi.org/10.3390/atmos11121332 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/45580 2023-05-15T13:03:19+02:00 Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) Ramos, Miguel Vieira, Gonçalo de Pablo, Miguel Angel Molina, Antonio Jiménez Cuenca, Juan Javier 2020-12-29T14:56:23Z http://hdl.handle.net/10451/45580 https://doi.org/10.3390/atmos11121332 eng eng MDPI info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAG-GLO%2F3908%2F2012/PT https://www.mdpi.com/2073-4433/11/12/1332 Ramos, M., Vieira, G., de Pablo, M. A., Molina, A. & Jimenez, J.J. (2020). Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic). Atmosphere, 11(12), 1332. https://doi.org/10.3390/atmos11121332 2073-4433 http://hdl.handle.net/10451/45580 doi:10.3390/atmos11121332 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Permafrost Active layer Snow thickness Enthalpy article 2020 ftunivlisboa https://doi.org/10.3390/atmos11121332 2023-03-01T01:08:16Z The Antarctic Peninsula (AP) region has been one of the regions on Earth with strongest warming since 1950. However, the northwest of the AP showed a cooling from 2000 to 2015, which had local consequences with an increase in snow accumulation and a deceleration in the loss of mass from glaciers. In this paper, we studied the e ects of increased snow accumulation in the permafrost thermal regime in two boreholes (PG1 and PG2) in Livingston Island, South Shetlands Archipelago, from 2009 to 2015. The two boreholes located c. 300 m apart but at similar elevation showed di erent snow accumulation, with PG2 becoming completely covered with snow all year long, while the other remained mostly snow free during the summer. The analysis of the thermal regimes and of the estimated soil surface energy exchange during the study period showed the e ects of snow insulation in reducing the active layer thickness. These e ects were especially relevant in PG2, which transitioned from a subaerial to a subnival regime. There, permafrost aggraded from below, with the active layer completely disappearing and the e ciency of thermal insulation by the snowpack prevailing in the thermal regime. This situation may be used as an analogue for the transition from a periglacial to a subglacial environment in longer periods of cooling in the paleoenvironmental record. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Active layer thickness Antarc* Antarctic Antarctic Peninsula Livingston Island permafrost Universidade de Lisboa: repositório.UL Antarctic The Antarctic Antarctic Peninsula Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Atmosphere 11 12 1332 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Permafrost Active layer Snow thickness Enthalpy |
spellingShingle |
Permafrost Active layer Snow thickness Enthalpy Ramos, Miguel Vieira, Gonçalo de Pablo, Miguel Angel Molina, Antonio Jiménez Cuenca, Juan Javier Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
topic_facet |
Permafrost Active layer Snow thickness Enthalpy |
description |
The Antarctic Peninsula (AP) region has been one of the regions on Earth with strongest warming since 1950. However, the northwest of the AP showed a cooling from 2000 to 2015, which had local consequences with an increase in snow accumulation and a deceleration in the loss of mass from glaciers. In this paper, we studied the e ects of increased snow accumulation in the permafrost thermal regime in two boreholes (PG1 and PG2) in Livingston Island, South Shetlands Archipelago, from 2009 to 2015. The two boreholes located c. 300 m apart but at similar elevation showed di erent snow accumulation, with PG2 becoming completely covered with snow all year long, while the other remained mostly snow free during the summer. The analysis of the thermal regimes and of the estimated soil surface energy exchange during the study period showed the e ects of snow insulation in reducing the active layer thickness. These e ects were especially relevant in PG2, which transitioned from a subaerial to a subnival regime. There, permafrost aggraded from below, with the active layer completely disappearing and the e ciency of thermal insulation by the snowpack prevailing in the thermal regime. This situation may be used as an analogue for the transition from a periglacial to a subglacial environment in longer periods of cooling in the paleoenvironmental record. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ramos, Miguel Vieira, Gonçalo de Pablo, Miguel Angel Molina, Antonio Jiménez Cuenca, Juan Javier |
author_facet |
Ramos, Miguel Vieira, Gonçalo de Pablo, Miguel Angel Molina, Antonio Jiménez Cuenca, Juan Javier |
author_sort |
Ramos, Miguel |
title |
Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
title_short |
Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
title_full |
Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
title_fullStr |
Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
title_full_unstemmed |
Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic) |
title_sort |
transition from a subaerial to a subnival permafrost temperature regime following increased snow cover (livingston island, maritime antarctic) |
publisher |
MDPI |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/45580 https://doi.org/10.3390/atmos11121332 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Livingston Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Livingston Island |
genre |
Active layer thickness Antarc* Antarctic Antarctic Peninsula Livingston Island permafrost |
genre_facet |
Active layer thickness Antarc* Antarctic Antarctic Peninsula Livingston Island permafrost |
op_relation |
info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAG-GLO%2F3908%2F2012/PT https://www.mdpi.com/2073-4433/11/12/1332 Ramos, M., Vieira, G., de Pablo, M. A., Molina, A. & Jimenez, J.J. (2020). Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic). Atmosphere, 11(12), 1332. https://doi.org/10.3390/atmos11121332 2073-4433 http://hdl.handle.net/10451/45580 doi:10.3390/atmos11121332 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/atmos11121332 |
container_title |
Atmosphere |
container_volume |
11 |
container_issue |
12 |
container_start_page |
1332 |
_version_ |
1766333757380362240 |