Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica)
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...
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ftunivlisboa:oai:repositorio.ul.pt:10451/36179 2023-05-15T13:59:03+02:00 Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot 2018-12-26T11:43:23Z http://hdl.handle.net/10451/36179 https://doi.org/10.1016/j.catena.2016.07.011 eng eng Elsevier https://reader.elsevier.com/reader/sd/pii/S0341816216302703?token=F54AFA0B7FE68DDF2BC9D470E72C484DA667969E790AF66D4B84A24D0F044041A00C9687EA1212FC597F0813D8C96BB8 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 http://hdl.handle.net/10451/36179 doi:10.1016/j.catena.2016.07.011 embargoedAccess Active layer Topography Snow cover Byers Peninsula Antarctica article 2018 ftunivlisboa https://doi.org/10.1016/j.catena.2016.07.011 2023-02-08T01:07:17Z 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. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctica Livingston Island permafrost South Shetland Islands Universidade de Lisboa: repositório.UL Byers ENVELOPE(-60.283,-60.283,-63.900,-63.900) Byers peninsula ENVELOPE(-61.066,-61.066,-62.633,-62.633) Cerro Negro ENVELOPE(-61.002,-61.002,-62.655,-62.655) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) South Shetland Islands CATENA 149 548 559 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Active layer Topography Snow cover Byers Peninsula Antarctica |
spellingShingle |
Active layer Topography Snow cover Byers Peninsula Antarctica Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) |
topic_facet |
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. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot |
author_facet |
Oliva, Marc Hrbacek, Filip Ruiz-Fernández, Jesús de Pablo, Miguel Ángel Vieira, Goncalo Ramos, Miguel Antoniades, Dermot |
author_sort |
Oliva, Marc |
title |
Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, 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) |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://hdl.handle.net/10451/36179 https://doi.org/10.1016/j.catena.2016.07.011 |
long_lat |
ENVELOPE(-60.283,-60.283,-63.900,-63.900) ENVELOPE(-61.066,-61.066,-62.633,-62.633) ENVELOPE(-61.002,-61.002,-62.655,-62.655) ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Byers Byers peninsula Cerro Negro Livingston Island South Shetland Islands |
geographic_facet |
Byers Byers peninsula Cerro Negro Livingston Island South Shetland Islands |
genre |
Antarc* Antarctica Livingston Island permafrost South Shetland Islands |
genre_facet |
Antarc* Antarctica Livingston Island permafrost South Shetland Islands |
op_relation |
https://reader.elsevier.com/reader/sd/pii/S0341816216302703?token=F54AFA0B7FE68DDF2BC9D470E72C484DA667969E790AF66D4B84A24D0F044041A00C9687EA1212FC597F0813D8C96BB8 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 http://hdl.handle.net/10451/36179 doi:10.1016/j.catena.2016.07.011 |
op_rights |
embargoedAccess |
op_doi |
https://doi.org/10.1016/j.catena.2016.07.011 |
container_title |
CATENA |
container_volume |
149 |
container_start_page |
548 |
op_container_end_page |
559 |
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1766267419434680320 |