Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/28320
Título: A proxy for snow cover and winter ground surface cooling: mapping Usnea sp. communities using high resolution remote sensing imagery (Maritime Antarctica)
Autor: Vieira, Gonçalo
Mora, Carla
Pina, Pedro
Schaefer, Carlos E.R.
Palavras-chave: Permafrost
Bioindicators
Snow cover
Ground surface cooling
Fildes Peninsula
Antarctica
Data: 2014
Editora: Elsevier
Resumo: Usnea sp. formations show a spatial distribution coinciding with wind-exposed locations on rock knobs or sedimentary bodies, while they are commonly absent from concave sites. Field collection of georeferenced ground truthing data in the Meseta Norte (Fildes Peninsula, Maritime Antarctica) and the application of supervised classification techniques over a summer high resolution QuickBird satellite scene showed excellent classification accuracy for the different landcover types. The results show that Usnea formation distribution maps are a viable proxy for areas with less snow during the cold season. Such an approach provides input for permafrost and active layer modelling since snow acts as a critical control on ground surface heat balance. Since snow mapping is extremely difficult in Maritime Antarctica our tested approach provides important added-value for empirical–statistical modelling of permafrost distribution.
Peer review: yes
URI: http://hdl.handle.net/10451/28320
DOI: 10.1016/j.geomorph.2014.03.049
ISSN: 0169-555X
1872-695X
Aparece nas colecções:IGOT - Artigos em Revistas Internacionais

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