Fast-ice Distribution in East Antarctica During 1997 and 1999 Determined Using RADARSAT Data

An image correlation technique has been applied to RADARSAT ScanSAR images from November in 1997, and November 1999, to create the first detailed maps of fast ice around East Antarctica (75E-170E). This method is based upon searching for, and distinguishing, correlated regions of the ice-covered ocean which remain stationary, in contrast to adjacent moving pack ice. Within the overlapping longitudinal range of ~86E-150.6E, the total fast-ice area is 141,450 km2 in 1997 and 152,216 km2 in 1999. Calibrated radar backscatter data are also used to determine the distribution of two fast-ice classes based on their surface roughness characteristics.The outer boundaries of the determined fast-ice area for November in 1997 and 1999 are contained in the data files for this record.This work has been allocated to ASAC project 3024.

本研究将图像相关技术应用于1997年11月与1999年11月的RADARSAT扫描合成孔径雷达（ScanSAR）影像，绘制了东南极洲（75E-170E）周边固定冰（fast ice）的首张详细分布图。该方法通过搜寻并区分覆冰海域中保持静止的相关区域，以此与周边移动的流冰（pack ice）相区分。在约86E-150.6E的重叠经度范围内，1997年固定冰总面积为141450 km²，1999年则为152216 km²。本研究还利用校准后的雷达后向散射数据，依据表面粗糙度特征对两类固定冰进行分类并明确其分布。本记录的数据文件中包含了1997年11月与1999年11月所确定的固定冰区域外围边界。本研究隶属于ASAC项目3024。