Geomorphology and soils distribution under paraglacial conditions in an ice-free area of Admiralty Bay, King George Island, Antarctica

Francelino, Márcio Rocha; Schaefer, Carlos Ernesto Gonçalves Reynaud; Simas, Felipe Nogueira Bello; Filho, Elpídio Inácio Fernandes; Souza, José João Lelis Leal de; Costa, Liovando Marciano da

doi:10.1016/j.catena.2010.12.007

Cited by 86 publications

(78 citation statements)

References 16 publications

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“…Alguns horizontes na base de P3, na porção baixa, apesentaram matiz mais avermelhada (2,5YR) intercalada com zonas acinzentadas e amareladas, revelando um solo de coloração variegada, sobreposto por um nivel concrecionado (Csm). O predominio de cores amareladas é semelhante ao que foi observado em outros solos sulfatados (FRANCELINO et al, 2011;SIMAS et al, 2006;SOUZA et al, 2014) e, tal como nestes estudos, solos com essa coloração são mais argilosos que outros solos da Antártica . Tais características corroboram com a indicação de Campbell & Claridge (1987) da importância de considerar a cor como um atributo fundamental no estudo de solos em dominios polares, inclusive do seu grau evolutivo.…”

Section: Resultsunclassified

“…A acidificação gerada pela oxidação dos sulfetos tem um papel importante no intemperismo mineral e solubilização de consituintes químicos, como o Fe e outros íons (FRANCELINO et al, 2011). Contudo, o relevo exerce importante influência na dinâmica de transporte de soluções e mobilização desse Fe (no perfil e na vertente).…”

Section: Discussionunclassified

“…A maior diversidade de processos repercute numa variedade de tipos de solos, com destaque para aqueles associados à dinamica do permafrost, os solos ornitogênicos e os solos sulfatados (FRANCELINO et al, 2011;MICHEL et al, 2014).…”

Section: Introductionunclassified

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Solos e Evolução da Paisagem em Ambiente Periglacial na Península Barton, Antártica Marítima

et al. 2017

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Solos e Evolução da Paisagem em Ambiente Periglacial na Península Barton, Antártica Marítima

et al. 2017

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“…The altitude ranges from 0 to 340 m a.s.l. (Francelino et al, 2011). The geology is predominantly basaltandesites and pyritized andesite rocks.…”

Section: Study Areamentioning

confidence: 99%

“…In addition, soil types and properties vary significantly across the landscape, mainly related to landscape characteristics, especially drainage (Pereira and Putzke, 2013). Antarctic soils have been the subject of several studies (Beyer et al, 2000;Simas et al, 2008;Francelino et al, 2011;Moura et al, 2012) that have promoted an increasing understanding of soil-forming processes and soil distribution and classification.…”

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Environmental Correlation and Spatial Autocorrelation of Soil Properties in Keller Peninsula, Maritime Antarctica

Moraes

Francelino

Carvalho

et al. 2018

Rev. Bras. Ciênc. Solo

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ABSTRACT:The pattern of variation in soil and landform properties in relation to environmental covariates are closely related to soil type distribution. The aim of this study was to apply digital soil mapping techniques to analysis of the pattern of soil property variation in relation to environmental covariates under periglacial conditions at Keller Peninsula, Maritime Antarctica. We considered the hypothesis that covariates normally used for environmental correlation elsewhere can be adequately employed in periglacial areas in Maritime Antarctica. For that purpose, 138 soil samples from 47 soil sites were collected for analysis of soil chemical and physical properties. We tested the correlation between soil properties (clay, potassium, sand, organic carbon, and pH) and environmental covariates. The environmental covariates selected were correlated with soil properties according to the terrain attributes of the digital elevation model (DEM). The models evaluated were linear regression, ordinary kriging, and regression kriging. The best performance was obtained using normalized height as a covariate, with an R 2 of 0.59 for sand. In contrast, the lowest R 2 of 0.15 was obtained for organic carbon, also using the regression kriging method. Overall, results indicate that, despite the predominant periglacial conditions, the environmental covariates normally used for digital terrain mapping of soil properties worldwide can be successfully employed for understanding the main variations in soil properties and soil-forming factors in this region.

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Coupling patterns between para‐glacial and permafrost degradation responses in Antarctica

Oliva

Fernández

2015

Earth Surf Processes Landf

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The recently deglaciated environments in maritime permafrost regions are usually affected by very active paraglacial processes. Elephant Point is an ice‐free area of 1.16 km2 located in the SW of Livingston island (South Shetland Islands, Antarctica). Between 1956–2010 the retreat of the ice cap covering most part of this island has exposed 17.3% of the land surface in this peninsula. Two geomorphological units were identified in this new ice‐free area: a moraine extending from the western to the eastern coastlines and a relatively flat proglacial surface. The glacier in 1956 sat in contact with the northern slope of the moraine, but its accelerated retreat ‐ in parallel to the warming trend recorded in the Antarctic Peninsula ‐ left these areas free of glacier ice. Subsequently, the postglacial evolution was controlled by the relaxation phase typical of paraglacial systems. The typology and intensity of geomorphological processes show a significantly different dynamics between the southern and northern slopes of the moraine. This pattern is related to the different stage of paraglacial adjustment in both slopes. In the southern side, on coarser sediments, pronival ramparts, debris flows and alluvial fans are distributed, with a low to moderate activity of slope processes. In the northern side, mass wasting processes are extremely active on fine‐grained unconsolidated sediments. Ice‐rich permafrost is being degraded by thermokarst processes. Landslides and mudflows transfer large amounts of sediments down‐slope. The surface affected by retrogressive‐thaw slumps in the moraine has been quantified in 24,172 m2, which accounts for 9.6% of its surface. The abundance of kettle‐lakes is also indicative of the degradation of the ground ice. Paraglacial processes are expected to continue in the moraine and proglacial area in the near future, although their intensity and duration will depend on the magnitude and rate of future climate trends in the northern Antarctic Peninsula. Copyright © 2015 John Wiley & Sons, Ltd.

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Geomorphology and soils distribution under paraglacial conditions in an ice-free area of Admiralty Bay, King George Island, Antarctica

Cited by 86 publications

References 16 publications

Solos e Evolução da Paisagem em Ambiente Periglacial na Península Barton, Antártica Marítima

Solos e Evolução da Paisagem em Ambiente Periglacial na Península Barton, Antártica Marítima

Environmental Correlation and Spatial Autocorrelation of Soil Properties in Keller Peninsula, Maritime Antarctica

Coupling patterns between para‐glacial and permafrost degradation responses in Antarctica

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