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dc.contributor.author
Ramos, M.
dc.contributor.author
Vieira, G.
dc.contributor.author
de Pablo, M. A.
dc.contributor.author
Molina, A.
dc.contributor.author
Abramov, A.
dc.contributor.author
Goyanes, Gabriel Alejandro
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dc.date.available
2018-07-25T15:37:13Z
dc.date.issued
2017-02
dc.identifier.citation
Ramos, M.; Vieira, G.; de Pablo, M. A.; Molina, A.; Abramov, A.; et al.; Recent shallowing of the thaw depth at Crater Lake, Deception Island, Antarctica (2006–2014); Elsevier Science; Catena; 149; 2-2017; 519-528
dc.identifier.issn
0341-8162
dc.identifier.uri
http://hdl.handle.net/11336/53075
dc.description.abstract
The Western Antarctic Peninsula region is one of the hot spots of climate change and one of the most ecologically sensitive regions of Antarctica, where permafrost is near its climatic limits. The research was conducted in Deception Island, an active stratovolcano in the South Shetlands archipelago off the northern tip of the Antarctic Peninsula. The climate is polar oceanic, with high precipitation and mean annual air temperatures (MAAT) close to − 3 �C. The soils are composed by ashes and pyroclasts with high porosity and high water content, with ice-rich permafrost at − 0.8 �C at the depth of zero annual amplitude, with an active layer of about 30 cm. Results from thaw depth, ground temperature and snow cover monitoring at the Crater Lake CALM-S site over the period 2006 to 2014 are analyzed. Thaw depth (TD) was measured by mechanical probing once per year in the end of January or early February in a 100 � 100 m with a 10 m spacing grid. The results show a trend for decreasing thaw depth from ci. 36 cm in 2006 to 23 cm in 2014, while MAAT, as well as ground temperatures at the base of the active layer, remained stable. However, the duration of the snow cover at the CALM-S site, measured through the Snow Pack Factor (SF) showed an increase from 2006 to 2014, especially with longer lasting snow cover in the spring and early summer. The negative correlation between SF and the thaw depth supports the significance of the influence of the increasing snow cover in thaw depth, even with no trend in the MAAT. The lack of observed ground cooling in the base of the active layer is probably linked to the high ice/water content at the transient layer. The pyroclastic soils of Deception Island, with high porosity, are key to the shallow active layer depths, when compared to other sites in the Western Antarctic Peninsula (WAP). These findings support the lack of linearity between atmospheric warming and permafrost warming and induce an extra complexity to the understanding of the effects of climate change in the ice-free areas of the WAP, especially in scenarios with increased precipitation as snow fall.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Active Layer
dc.subject
Antarctic Peninsula
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Decreasing Thaw Depth
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Permafrost
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Snow Insulation
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Recent shallowing of the thaw depth at Crater Lake, Deception Island, Antarctica (2006–2014)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-25T13:51:59Z
dc.journal.volume
149
dc.journal.pagination
519-528
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Ramos, M.. Universidad de Alcalá; España
dc.description.fil
Fil: Vieira, G.. Universidade de Lisboa; Portugal
dc.description.fil
Fil: de Pablo, M. A.. Universidad de Alcalá; España
dc.description.fil
Fil: Molina, A.. Universidad de Alcalá; España
dc.description.fil
Fil: Abramov, A.. Russian Academy of Science; Rusia
dc.description.fil
Fil: Goyanes, Gabriel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
Catena
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.catena.2016.07.019
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0341816216302788
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