Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica)
Main Author: | |
---|---|
Publication Date: | 2017 |
Other Authors: | , , , , , |
Format: | Article |
Language: | eng |
Source: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Download full: | http://hdl.handle.net/10451/36179 |
Summary: | Topography exerts a key role in controlling permafrost distribution in areas where mean annual temperatures are slightly negative. One such case is the low-altitude environments of Maritime Antarctica, where permafrost is sporadic to discontinuous below 20–40 m asl and continuous at higher areas and active layer dynamics are thus strongly conditioned by geomorphological setting. In January 2014 we installed three sites for monitoring active layer temperatures across Byers Peninsula (Livingston Island, South Shetland Islands) at elevations between 45 and 100 m. The sites are situated in lake catchments (lakes Escondido, Cerro Negro, and Domo) that have different geomorphological and topographical conditions. Our objective was to examine the role of topography and microclimatic conditions in determining the active layer thermal regime in order to identify the factors that control geomorphic processes in these lake catchments. At each site a set of loggers was installed to monitor air temperature (AT), snow thickness (SwT) and soil temperature (ST) down to 80 cm depth. Mean annual air temperatures (MAAT) showed similar values in the three sites (−2.7 to −2.6 °C) whereas soil temperatures showed varying active layer thicknesses at the three catchments. The ground thermal regime was strongly controlled by soil properties and snow cover thickness and duration, which is influenced by local topography. Geomorphological processes operating at the lake catchment scale control lacustrine sedimentation processes, and both are dependent on the combination of topographical and climatic conditions. Therefore, the interpretation of lake sediment records from these three lakes requires that soil thermal regime and snow conditions at each site be taken into account in order to properly isolate the geomorphological, environmental and climatic signals preserved in these lake records. |
id |
RCAP_1d73add9fcf6a977a5f04a61477f293a |
---|---|
oai_identifier_str |
oai:repositorio.ul.pt:10451/36179 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica)Active layerTopographySnow coverByers PeninsulaAntarcticaTopography exerts a key role in controlling permafrost distribution in areas where mean annual temperatures are slightly negative. One such case is the low-altitude environments of Maritime Antarctica, where permafrost is sporadic to discontinuous below 20–40 m asl and continuous at higher areas and active layer dynamics are thus strongly conditioned by geomorphological setting. In January 2014 we installed three sites for monitoring active layer temperatures across Byers Peninsula (Livingston Island, South Shetland Islands) at elevations between 45 and 100 m. The sites are situated in lake catchments (lakes Escondido, Cerro Negro, and Domo) that have different geomorphological and topographical conditions. Our objective was to examine the role of topography and microclimatic conditions in determining the active layer thermal regime in order to identify the factors that control geomorphic processes in these lake catchments. At each site a set of loggers was installed to monitor air temperature (AT), snow thickness (SwT) and soil temperature (ST) down to 80 cm depth. Mean annual air temperatures (MAAT) showed similar values in the three sites (−2.7 to −2.6 °C) whereas soil temperatures showed varying active layer thicknesses at the three catchments. The ground thermal regime was strongly controlled by soil properties and snow cover thickness and duration, which is influenced by local topography. Geomorphological processes operating at the lake catchment scale control lacustrine sedimentation processes, and both are dependent on the combination of topographical and climatic conditions. Therefore, the interpretation of lake sediment records from these three lakes requires that soil thermal regime and snow conditions at each site be taken into account in order to properly isolate the geomorphological, environmental and climatic signals preserved in these lake records.ElsevierRepositório da Universidade de LisboaOliva, MarcHrbacek, FilipRuiz-Fernández, Jesúsde Pablo, Miguel ÁngelVieira, GoncaloRamos, MiguelAntoniades, Dermot2020-01-01T01:30:17Z20172017-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/36179engOliva, M., Hrbacek, F., Ruiz-Fernandez, J., Angel de Pablo, M., Vieira, G., Ramos, M., Antoniades, D. (2017). Active layer dynamics in three topographically distinct in Byers Peninsula (Livingston Island, Antarctica). Catena, 149(2, SI), 548–559. https://doi.org/10.1016/j.catena.2016.07.011.0341-816210.1016/j.catena.2016.07.011info:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:32:38Zoai:repositorio.ul.pt:10451/36179Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:50:29.143191Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
title |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
spellingShingle |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) Oliva, Marc Active layer Topography Snow cover Byers Peninsula Antarctica |
title_short |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
title_full |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
title_fullStr |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
title_full_unstemmed |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
title_sort |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
author |
Oliva, Marc |
author_facet |
Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot |
author_role |
author |
author2 |
Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot |
dc.subject.por.fl_str_mv |
Active layer Topography Snow cover Byers Peninsula Antarctica |
topic |
Active layer Topography Snow cover Byers Peninsula Antarctica |
description |
Topography exerts a key role in controlling permafrost distribution in areas where mean annual temperatures are slightly negative. One such case is the low-altitude environments of Maritime Antarctica, where permafrost is sporadic to discontinuous below 20–40 m asl and continuous at higher areas and active layer dynamics are thus strongly conditioned by geomorphological setting. In January 2014 we installed three sites for monitoring active layer temperatures across Byers Peninsula (Livingston Island, South Shetland Islands) at elevations between 45 and 100 m. The sites are situated in lake catchments (lakes Escondido, Cerro Negro, and Domo) that have different geomorphological and topographical conditions. Our objective was to examine the role of topography and microclimatic conditions in determining the active layer thermal regime in order to identify the factors that control geomorphic processes in these lake catchments. At each site a set of loggers was installed to monitor air temperature (AT), snow thickness (SwT) and soil temperature (ST) down to 80 cm depth. Mean annual air temperatures (MAAT) showed similar values in the three sites (−2.7 to −2.6 °C) whereas soil temperatures showed varying active layer thicknesses at the three catchments. The ground thermal regime was strongly controlled by soil properties and snow cover thickness and duration, which is influenced by local topography. Geomorphological processes operating at the lake catchment scale control lacustrine sedimentation processes, and both are dependent on the combination of topographical and climatic conditions. Therefore, the interpretation of lake sediment records from these three lakes requires that soil thermal regime and snow conditions at each site be taken into account in order to properly isolate the geomorphological, environmental and climatic signals preserved in these lake records. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017 2017-01-01T00:00:00Z 2020-01-01T01:30:17Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10451/36179 |
url |
http://hdl.handle.net/10451/36179 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Oliva, M., Hrbacek, F., Ruiz-Fernandez, J., Angel de Pablo, M., Vieira, G., Ramos, M., Antoniades, D. (2017). Active layer dynamics in three topographically distinct in Byers Peninsula (Livingston Island, Antarctica). Catena, 149(2, SI), 548–559. https://doi.org/10.1016/j.catena.2016.07.011. 0341-8162 10.1016/j.catena.2016.07.011 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/embargoedAccess |
eu_rights_str_mv |
embargoedAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799134439283884032 |