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根据海冰船测目视观测标准在MODIS影像上提取模拟的海冰边界,并利用相应的MODIS海冰密集度验证AMSR-E海冰密集度产品在海冰边界的精度。研究结果表明,海冰边界像素上,AMSR-E海冰密集度的平均值与15%阈值存在显著差异,且AMSR-E与MODIS海冰密集度的相关性很弱(R2≤0.2),基于ASI的海冰反演算法在夏季低估边界海冰密集度。考虑整个冰区(包括多年冰、一年冰、新冰和开阔海域)的截线分析显示,AMSR-E与MODIS海冰密集度存在较好的线性关系(夏季R2=0.82,冬季R2=0.81),AMSR-E海冰密集度在20%~30%区间的误差最大。
The simulated sea-ice boundary was extracted on the MODIS image according to the sea ice visual observation standard. The precision of the AMSR-E sea ice-intensive product at the sea-ice boundary was verified by the corresponding MODIS sea ice concentration. The results show that the average AMSR-E sea ice concentration is significantly different from the 15% threshold on the sea-ice boundary pixels, and the correlation between AMSR-E and MODIS sea ice concentration is very weak (R2≤0.2) ASI’s sea ice inversion algorithm underestimates the boundary sea ice concentration in summer. A cross-sectional analysis of the entire ice region (including years of ice, year of ice, fresh ice and open sea) shows that there is a good linear relationship between sea-ice intensities of AMSR-E and MODIS (R2 = 0.82 in summer and R2 = 0.81 in winter ), The error of AMSR-E sea ice concentration ranged from 20% to 30%.