期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2009
卷号：XXXVIII-8/W3
页码：385
出版社：Copernicus Publications
摘要：The widespread retreat of glaciers can be considered as response to the climate change. Being the largest retreating glacier-ice shelf system in East Antarctica, the Amery Ice Shelf-Lambert Glacier system plays an important role in contributing to sea level rise as well as surrounding environment and climate. The present study is focused on the investigation of this ice shelf system using mid-month Ku-band scatterometer data from January 2000 to July 2009. The corresponding monthly weather data of Davis Station was obtained from the web site of Australian Antarctic Division. Average backscatter of all the pixels, within the selected sites, was generated and Microwave Polarization Difference Index (MPDI) was computed. It was observed that backscattering coefficients of H- and V-components increase from January 2000 to June 2006. A very prominent dip in the backscatter observed in the month of January is a distinct signature taking place due to physical process of large scale melting of ice/snow surface. The increase in February is attributed to the initiation of the freezing phenomenon. The comparison with monthly air-temperature data shows significant correlation with MPDI. The correlation of the order of 0.99 of annual maximum MPDI with the annual maximum and minimum air-temperatures has been found for the site adjacent to the Lambert Glacier. The change in backscatter behavior from year 2006 is evident as decreasing trend is observed after July 2006 in the time series data. This could be due to cyclic behavior of the system with half cycle of 6-years; however, it needs further investigations
