Title Use of ERS-SAR imagery to monitor surficial snow and ice in the northeastern Antarctic Peninsula [Uso de imagens ERS SAR no monitoramento de zonas superficiais de neve e gelo da regiao nordeste da Peninsula Antarctica]
Author Mendes Junior, C.W.; Arigony Neto, J.; Ribeiro, R.d.R.; Simoes, J.C.
Author Affil Mendes Junior, C.W., Universidade Federal do Rio Grande do Sul, Centro Polar e Climatico, Porto Alegre, Brazil
Source Pesquisas em Geociencias, 36(2), p.203- 222, . Publisher: Universidade Federal do Rio Grande do Sul, Instituto de Geociencias, Porto Alegre, Brazil. ISSN: 1518- 2398
Publication Date 2009
Notes In Portuguese with English summary. 24 refs. Ant. Acc. No: 91378. GeoRef Acc. No: 309706
Index Terms glaciers; ice; meteorology; radar; remote sensing; synthetic aperture radar; snow; Antarctica--Antarctic Peninsula; Antarctica--James Ross Island; Antarctic Peninsula; Antarctica; Corry Island; Eagle Island; ERS; geographic information systems; information systems; James Ross Island; monitoring; northeastern Antarctic Peninsula; radar methods; SAR; satellite methods; Trinity Peninsula; Vega Island
Abstract ERS SAR images acquired in the austral summer 1993 and 1996-97 and spring 1996 and 2000 were used for analyses of spatio- temporal variations of glacier facies (GF, i.e., dry-snow zone, percolation zone, wet- snow zone and glacier ice) on the northeastern Antarctic Peninsula (AP). The study area includes James Ross, Vega, Eagle and Corry islands and the northern region of the Trinity Peninsula. Algorithms based on decision rules were developed to the GF discrimination in ERS SAR images. Rock and coastline data from the Antarctic Digital Database were used to mask outcropping rocks and sea water, respectively. Total areas and maximum values of GF altitudes were calculated and images of variations and frequency of these zones were generated by using GIS spatial analysis tools. Furthermore, the GF dynamics were compared with mean daily surface air temperatures measured by meteorological stations. Significant changes were observed in GF on the AP from 1993 to 2000. The GF dynamics showed good correlations with interannual and seasonal variations of the surface air temperatures. The spatio-temporal variations were interpreted as responses of the different glaciers to the climatic, oceanographic and topographic parameters. The highest variations in GF were detected on the east side of the Trinity Peninsula, northwestern region of James Ross Island, eastern tip of Vega Island and western part of Eagle Island.
Publication Type journal article
Record ID 65006395