Active layer thermal regime at different vegetation covers at Lions Rump, King George Island, Maritime Antarctica

Detalhes bibliográficos
Autor(a) principal: Almeida, Ivan C. C.
Data de Publicação: 2014
Outros Autores: Schaefer, Carlos Ernesto G.R., Fernandes, Raphael B.A., Pereira, Thiago T.C., Nieuwendam, Alexandre, Pereira, Antônio Batista
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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spelling 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
instacron_str RCAAP
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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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