用于水色卫星性能跟踪的西北太平洋自然目标优选研究

A Study of Selecting the Optimal North-West of Pacific Natural Target to Evaluate the Sea Color Satellite Performance

利用空间分布均匀、海洋与大气光学特性年际稳定性高的海洋区域作为自然基准场,是开展水色卫星遥感器定标检验和长期辐射性能跟踪最为经济便捷的方式。本文以西北太平洋海域为例,利用2008—2018年共计11年的MODIS L3级月平均数据,从空间均匀度、季节变化性、年际稳定性上进行了场区更优化筛选,优选区域更加均匀,呈微弱的季节性变化和非常一致的年际变化,适合全年开展定标检验和遥感器辐射性能跟踪工作。

The ocean area with uniform spatial distribution and high inter-annual stability of oceanic and atmospheric optical properties is the most economical and convenient way to carry out calibration and validation of the sea color satellite remote sensor and long-term radiation performance tracking. In this paper, taking the North-West of Pacific as an example, the monthly average data of MODIS L3 from 2008 to 2018(a total of 11 years) was used to conduct the field area optimization screening in terms of spatial uniformity, seasonal variation, and inter-annual stability. The optimal region is more evenly distributed, carrying very slight seasonal variations and highly consistent inter-annual differences, which is suitable for calibration and validation and for evaluating the performance of the remote sensor radiation throughout the year.