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Active layer and permafrost thermal regimes in the ice-free areas of Antarctica

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dc.contributor.authorHrbáček, Filip
dc.contributor.authorOliva, Marc
dc.contributor.authorHansen, Christel
dc.contributor.authorBalks, Megan
dc.contributor.authorO'Neill, Tanya Ann
dc.contributor.authorde Pablo, Miguel Angel
dc.contributor.authorPonti, Stefano
dc.contributor.authorRamos, Miguel
dc.contributor.authorVieira, Gonçalo
dc.contributor.authorAbramov, Andrey
dc.contributor.authorKaplan Pastíriková, Lucia
dc.contributor.authorGuglielmin, Mauro
dc.contributor.authorGoyanes, Gabriel
dc.contributor.authorFrancelino, Marcio Rocha
dc.contributor.authorSchaefer, Carlos
dc.contributor.authorLacelle, Denis
dc.date.accessioned2023-07-18T10:54:02Z
dc.date.available2023-07-18T10:54:02Z
dc.date.issued2023
dc.description.abstractIce-free areas occupy <0.5% of Antarctica and are unevenly distributed across the continent. Terrestrial ecosystem dynamics in ice free areas are strongly influenced by permafrost and the associated active layer. These features are the least studied component of the cryosphere in Antarctica, with sparse data from permanent study sites mainly providing information related to the ground thermal regime and active layer thickness (ALT). One of the most important results of the International Polar Year (IPY, 2007/08) was an increase in ground thermal regime monitoring sites, and consequently our knowledge of Antarctic permafrost dynamics. Now, 15 years after the IPY, we provide the first comprehensive summary of the state of permafrost across Antarctica, including the sub-Antarctic Islands, with analyses of spatial and temporal patterns of the dominant external factors (climate, lithology, biota, and hydric regime) on the ground thermal regime and active layer thickness. The mean annual ground temperatures of the active layer and uppermost part of the permafrost in Antarctica remain just below 0 °C in the warmest parts of the Antarctic Peninsula, and were below −20 °C in mountainous regions of the continent. The ALT varies between a few cm in the coldest, mountainous, parts of the Transantarctic Mountains up to >5 m in bedrock sites in the Antarctic Peninsula. The deepest and most variable ALTs (ca. 40 to >500 cm) were found in the Antarctic Peninsula, whereas the maximum ALT generally did not exceed 90 cm in Victoria Land and East Antarctica. Notably, found that the mean annual near-surface temperature follows the latitudinal gradient of −0.9 °C/deg. (R2 = 0.9) and the active layer thickness 3.7 cm/deg. (R2 = 0.64). The continuous permafrost occurs in the vast majority of the ice-free areas in Antarctica. The modelling of temperature on the top of the permafrost indicates also the permafrost presence in South Orkneys and South Georgia. The only areas where deep boreholes and geophysical surveys indicates discontinuous or sporadic permafrost are South Shetlands and Western Antarctic Peninsula.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationHrbáček, F., Oliva, M., Hansen, C., Balks, M., O’Neill, T. A., Pablo, M. A. de, Ponti, S., Ramos, M., Vieira, G., Abramov, A., Kaplan Pastíriková, L., Guglielmin, M., Goyanes, G., Francelino, M. R., Schaefer, C., & Lacelle, D. (2023). Active layer and permafrost thermal regimes in the ice-free areas of Antarctica. Earth-Science Reviews, 242, 104458. https://doi.org/10.1016/j.earscirev.2023.104458pt_PT
dc.identifier.doi10.1016/j.earscirev.2023.104458pt_PT
dc.identifier.eissn1872-6828
dc.identifier.issn0012-8252
dc.identifier.urihttp://hdl.handle.net/10451/58646
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationNUNANTAR (Fundação para a Ciência e Tecnologia of Portugal; 02/SAICT/2017 - 32002)pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0012825223001472?via%3Dihubpt_PT
dc.subjectGround thermal regimept_PT
dc.subjectActive layer thicknesspt_PT
dc.subjectClimate changept_PT
dc.subjectAntarctic ice-free environmentpt_PT
dc.subjectCryosolspt_PT
dc.subjectGelisolspt_PT
dc.subjectPermafrostpt_PT
dc.titleActive layer and permafrost thermal regimes in the ice-free areas of Antarcticapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage104458pt_PT
oaire.citation.titleEarth-Science Reviewspt_PT
oaire.citation.volume242pt_PT
person.familyNameOliva
person.familyNameRamos
person.familyNameBrito Guapo Teles Vieira
person.familyNameGoyanes
person.givenNameMarc
person.givenNameMiguel
person.givenNameGonçalo
person.givenNameGabriel Alejandro
person.identifierG-5958-2010
person.identifier.ciencia-id5510-AC71-085A
person.identifier.ciencia-id2519-6583-CAEA
person.identifier.ciencia-id8018-A674-1A98
person.identifier.orcid0000-0001-6521-6388
person.identifier.orcid0000-0003-3648-6818
person.identifier.orcid0000-0001-7611-3464
person.identifier.orcid0000-0001-5241-254X
person.identifier.ridK-5423-2014
person.identifier.ridK-2230-2014
person.identifier.scopus-author-id35225198700
person.identifier.scopus-author-id8676487200
person.identifier.scopus-author-id7005863976
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd416bf65-77f6-488e-b275-5fbb257df6d4
relation.isAuthorOfPublicationa0544f42-b78e-4fd4-9204-f6acfa4e1e9d
relation.isAuthorOfPublication7039fbb2-e1f8-4c3e-80f1-603b12d33c1c
relation.isAuthorOfPublicationc1018504-1700-445d-8130-cdfe9e0ec98c
relation.isAuthorOfPublication.latestForDiscoveryc1018504-1700-445d-8130-cdfe9e0ec98c

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