Mots-clés
Alaska ; Années 1999-2002 ; Bilan hydrologique ; Dégradation de l'environnement ; LANDSAT ; Lac ; Pergélisol ; Périglaciaire ; Télédétection ; Variabilité climatique ; Variabilité interannuelle ; Yukon FlatsAlaska ; Climatic variability ; Environmental degradation ; Interannual variability ; LANDSAT ; Lake ; Periglacial features ; Permafrost ; Remote sensing ; Water balanceAlaska ; Balance hidrológico ; Degradación del medio ambiente ; LANDSAT ; Lago ; Pergelisol ; Periglaciar ; Teledetección ; Variabilidad climática ; Variabilidad interanualThe importance of natural variability in lake areas on the detection of permafrost degradation : A case study in the Yukon Flats, Alaska
Auteur(s) et Affiliation(s)
CHEN, M.
Div. of Earth and Environmental Sciences, National Lab., Los Alamos, Etats-Unis
ROWLAND, J.C.
Div. of Earth and Environmental Sciences, National Lab., Los Alamos, Etats-Unis
ALMANN, G.L.
Div. of Earth and Environmental Sciences, National Lab., Los Alamos, Etats-Unis
Dept. of Forest Sciences, Univ. of Alaska, Fairbanks, Etats-Unis
BRUMBY, S.P.
Div. of Intelligence and Space Research, National Lab., Los Alamos, Etats-Unis
Description :
In order to better understand the natural background variability of lake areas, the AA. used Landsat 7 images obtained on 11 dates from 1999 to 2002 to quantify the intra- and interannual lake area variability for a 4224 km2 study area within the Yukon Flats. Both intra- and interannual area variability in August and September were smaller than in June and July, suggesting that images from later in summer are more reliable for detecting long-term change in lake area. Variability of no-closure lakes was twice that of closed-basin lakes. For a given period, the total lake area was correlated more strongly with the water balance since the preceding October than with the water balance in the preceding 12 months. Spatial heterogeneity in the intra-annual area change of individual lakes was observed, which might be caused by different topographical, geological and permafrost characteristics around and beneath the lakes.
Type de document :
Article de périodique
Source :
Permafrost and periglacial processes, issn : 1045-6740, 2013, vol. 24, n°. 3, p. 224-240, nombre de pages : 17, Références bibliographiques : 2 p.
Date :
2013
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)