Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10451/27159 |
Resumo: | Climate change impacts the biotic and abiotic components of polar ecosystems, affecting the stability of permafrost, active layer thickness, vegetation, and soil. This paper describes the active layer thermal regimes of two adjacent shallow boreholes, under the same soil but with two different vegetations. The study is location in Lions Rump, at King George Island, Maritime Antarctic, one of the most sensitive regions to climate change, located near the climatic limit of Antarctic permafrost. Both sites are a Turbic Cambic Cryosol formed on andesitic basalt, one under moss vegetation (Andreaea gainii, at 85 m a.s.l.) and another under lichen (Usnea sp., at 86 m a.s.l.), located 10 m apart. Ground temperature at same depths (10, 30 and 80 cm), water content at 80 cm depth and air temperature were recorded hourly between March 2009 and February 2011. The two sites showed significant differences inmean annual ground temperature for all depths. The lichen site showed a higher soil temperature amplitude compared to the moss site, with ground surface (10 cm) showing the highest daily temperature in January 2011 (7.3 °C) and the lowest daily temperature in August (−16.5 °C). The soil temperature at the lichen site closely followed the air temperature trend. Themoss site showed a higherwater content at the bottommost layer, consistent with the water-saturated, low landscape position. The observed thermal buffering effect under mosses is primarily associatedwith highermoisture onsite, but a longer duration of the snowpack (not monitored) may also have influenced the results. Active layer thickness was approximately 150 cm at low-lyingmoss site, and 120 cm at well-drained lichen site. This allows to classify these soils as Cryosols (WRB) or Gelisols (Soil Taxonomy), with evident turbic features. |
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Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime AntarcticaSoil thermal regimeClimate changeCryosolPermafrostn-F indexLions RumpKing George IslandMaritime AntarcticaClimate change impacts the biotic and abiotic components of polar ecosystems, affecting the stability of permafrost, active layer thickness, vegetation, and soil. This paper describes the active layer thermal regimes of two adjacent shallow boreholes, under the same soil but with two different vegetations. The study is location in Lions Rump, at King George Island, Maritime Antarctic, one of the most sensitive regions to climate change, located near the climatic limit of Antarctic permafrost. Both sites are a Turbic Cambic Cryosol formed on andesitic basalt, one under moss vegetation (Andreaea gainii, at 85 m a.s.l.) and another under lichen (Usnea sp., at 86 m a.s.l.), located 10 m apart. Ground temperature at same depths (10, 30 and 80 cm), water content at 80 cm depth and air temperature were recorded hourly between March 2009 and February 2011. The two sites showed significant differences inmean annual ground temperature for all depths. The lichen site showed a higher soil temperature amplitude compared to the moss site, with ground surface (10 cm) showing the highest daily temperature in January 2011 (7.3 °C) and the lowest daily temperature in August (−16.5 °C). The soil temperature at the lichen site closely followed the air temperature trend. Themoss site showed a higherwater content at the bottommost layer, consistent with the water-saturated, low landscape position. The observed thermal buffering effect under mosses is primarily associatedwith highermoisture onsite, but a longer duration of the snowpack (not monitored) may also have influenced the results. Active layer thickness was approximately 150 cm at low-lyingmoss site, and 120 cm at well-drained lichen site. This allows to classify these soils as Cryosols (WRB) or Gelisols (Soil Taxonomy), with evident turbic features.ElsevierRepositório da Universidade de LisboaAlmeida, Ivan C. C.Schaefer, Carlos Ernesto G.R.Fernandes, Raphael B.A.Pereira, Thiago T.C.Nieuwendam, AlexandrePereira, Antônio Batista2017-03-09T13:33:44Z20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/27159engGeomorphology 225 (2014) 36–460169-555Xhttp://dx.doi.org/10.1016/j.geomorph.2014.03.048metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-11-20T17:33:59Zoai:repositorio.ul.pt:10451/27159Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-20T17:33:59Repositório 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 thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
title |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
spellingShingle |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica Almeida, Ivan C. C. Soil thermal regime Climate change Cryosol Permafrost n-F index Lions Rump King George Island Maritime Antarctica |
title_short |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
title_full |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
title_fullStr |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
title_full_unstemmed |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
title_sort |
Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica |
author |
Almeida, Ivan C. C. |
author_facet |
Almeida, Ivan C. C. Schaefer, Carlos Ernesto G.R. Fernandes, Raphael B.A. Pereira, Thiago T.C. Nieuwendam, Alexandre Pereira, Antônio Batista |
author_role |
author |
author2 |
Schaefer, Carlos Ernesto G.R. Fernandes, Raphael B.A. Pereira, Thiago T.C. Nieuwendam, Alexandre Pereira, Antônio Batista |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Almeida, Ivan C. C. Schaefer, Carlos Ernesto G.R. Fernandes, Raphael B.A. Pereira, Thiago T.C. Nieuwendam, Alexandre Pereira, Antônio Batista |
dc.subject.por.fl_str_mv |
Soil thermal regime Climate change Cryosol Permafrost n-F index Lions Rump King George Island Maritime Antarctica |
topic |
Soil thermal regime Climate change Cryosol Permafrost n-F index Lions Rump King George Island Maritime Antarctica |
description |
Climate change impacts the biotic and abiotic components of polar ecosystems, affecting the stability of permafrost, active layer thickness, vegetation, and soil. This paper describes the active layer thermal regimes of two adjacent shallow boreholes, under the same soil but with two different vegetations. The study is location in Lions Rump, at King George Island, Maritime Antarctic, one of the most sensitive regions to climate change, located near the climatic limit of Antarctic permafrost. Both sites are a Turbic Cambic Cryosol formed on andesitic basalt, one under moss vegetation (Andreaea gainii, at 85 m a.s.l.) and another under lichen (Usnea sp., at 86 m a.s.l.), located 10 m apart. Ground temperature at same depths (10, 30 and 80 cm), water content at 80 cm depth and air temperature were recorded hourly between March 2009 and February 2011. The two sites showed significant differences inmean annual ground temperature for all depths. The lichen site showed a higher soil temperature amplitude compared to the moss site, with ground surface (10 cm) showing the highest daily temperature in January 2011 (7.3 °C) and the lowest daily temperature in August (−16.5 °C). The soil temperature at the lichen site closely followed the air temperature trend. Themoss site showed a higherwater content at the bottommost layer, consistent with the water-saturated, low landscape position. The observed thermal buffering effect under mosses is primarily associatedwith highermoisture onsite, but a longer duration of the snowpack (not monitored) may also have influenced the results. Active layer thickness was approximately 150 cm at low-lyingmoss site, and 120 cm at well-drained lichen site. This allows to classify these soils as Cryosols (WRB) or Gelisols (Soil Taxonomy), with evident turbic features. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014 2014-01-01T00:00:00Z 2017-03-09T13:33:44Z |
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/10451/27159 |
url |
http://hdl.handle.net/10451/27159 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Geomorphology 225 (2014) 36–46 0169-555X http://dx.doi.org/10.1016/j.geomorph.2014.03.048 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
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 |
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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 |
mluisa.alvim@gmail.com |
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1817548938378477568 |