SeaWiFS-derived products in the Baltic Sea: performance analysis of a simple atmospheric correction algorithm
SeaWiFS-derived products in the Baltic Sea: performance analysis of a simple atmospheric correction algorithm
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发表时间：
2003-12
期刊：
影响因子：
2.9
通讯作者：
B. Bulgarelli;F. Mélin;G. Zibordi
中科院分区：
文献类型：
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作者：
B. Bulgarelli;F. Mélin;G. Zibordi
对波罗的海用于处理 SeaWiFS 数据的近似大气校正算法的精度分析进行了研究。该分析利用了具有代表性的大气-水测试案例的 FEM 辐射传输代码产生的理论辐射率。研究表明，865 nm 处气溶胶光学厚度和理论指数测定的不确定性分别低于 ±5% 和 ±10%。对位于波罗的海中部某个地点的卫星测量值和现场测量值之间的 59 次匹配进行的分析证实了这些结果。由于黄色物质的吸收相对较高，并且经常与倾斜的太阳光照相结合，光谱中蓝色部分的出水辐射亮度的反演显得高度退化，以至于反演值和模拟值之间几乎没有发现相关性。在其他波长下获得了更好的结果。遥感反射率R35的估算精度随着叶绿素a浓度的减小和黄色物质吸收的增加而降低，范围在±7%到±47%之间。论文全文可访问：http://www.iopan.gda.pl/oceanologia/
The accuracyanaly sis of an approximate atmospheric correction algorithm for the processing of SeaWiFS data has been investigated for the Baltic Sea. The analysis made use of theoretical radiances produced with the FEM radiative transfer code for representative atmosphere-water test cases. The studyshowed uncertainties in the determination of the aerosol optical thickness at 865 nm and of theom exponent lower than ±5% and ±10%, respectively. These results were confirmed bythe analy sis of 59 match-ups between satellite-derived and in situ measurements for a site located in the central Baltic. Because of the relativelyhigh y ellow substance absorption, often combined with the slanted solar illumination, the retrieval of the water-leaving radiance in the blue part of the spectrum appeared to be highlydegraded, to the extent that almost no correlation was found between retrieved and simulated values. Better results were obtained at the other wavelengths. The accuracyin the estimation of the remote sensing reflectance ratio R35 decreased with diminishing chlorophyll a concentration and increasing yellow substance absorption, ranging between ±7% and ±47%. The complete text of the paper is available at http://www.iopan.gda.pl/oceanologia/