南极海冰密集度多源数据的交叉检验

通过研究交叉检验船测样点上的7种不同尺度的海冰密集度数据,发现相同时间和相同空间尺度的海冰密集度值吻合度最高,不同时间不同尺度的海冰密集度值的相关性较弱。由数据获取时间不同引起的密集度差异在高分辨率数据上体现明显。真实船测点与伪船测点之间的吻合度不高,受观测者主观因素、天气条件、影像处理质量和伪船测点提取方法的影响。虽然伪船测点方法在海冰边界研究中具有快速、大面积提取边界点的优势,但需要控制提取算法中的误差传播。

Intercomparison of Multi-Sources Sea Ice Concentration Data in Antarctic

This study made comprehensive comparison of sea ice concentration derived from ship observations, optical and passive microwave images. Seven types of SIC derived from AMSR-E images and MODIS images were compared with RSO at 27 sample points between 2002 and 2007. The correlation between SIC derived from synchronous data observed at the same spatial scale had higher correlation coefficients than the others, whereas SICs observed at different times and scales displayed large inconsistencies. The correlation between SIC derived from data observed at the same spatial scale but at different times were affected by the spatial resolution. The RSO had considerably large differences with the PSO, the subjectivity in e visual estimation, weather conditions, quality of the image classification, and extraction method all attribute to their differences. Although the pseudo ship observation extraction method is helpful to generate large number of samples at the sea ice edges, error propagation must be controlled in the extraction process.