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SeaWiFS-derived products in the Baltic Sea: performance analysis of a simple atmospheric correction algorithm

机译：波罗的海的SeaWiFS衍生产品：一种简单的大气校正算法的性能分析

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The accuracy analysis 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 study showed uncertainties in the determination of the aerosol optical thickness at 865 nm and of the ?ngstr?m exponent lower than ± 5% and ± 10%, respectively. These results were confirmed by the analysis of 59 match-ups between satellite-derived and in situ measurements for a site located in the central Baltic. Because of the relatively high yellow 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 highly degraded, to the extent that almost no correlation was found between retrieved and simulated values. Better results were obtained at the other wavelengths. The accuracy in 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 propagation of R35 uncertainties on chlorophyll a estimation was quantified. Keeping the same atmosphere-water conditions, the atmospheric correction scheme appeared sensitive to seasonal changes in the Sun zenith.
机译：对于波罗的海，已经研究了用于处理SeaWiFS数据的近似大气校正算法的精度分析。该分析利用了FEM辐射传递代码产生的理论辐射，用于代表性的大气水测试用例。研究表明，测定865 nm处的气溶胶光学厚度和分别小于±5％和±10％的指纹指数的不确定性。这些结果通过分析波罗的海中部一个站点的卫星测量值与原位测量值之间的59个匹配而得到证实。由于相对较高的黄色物质吸收（通常与倾斜的太阳光结合使用），光谱蓝色部分中的留水辐射的回收率似乎大大降低，以至于几乎没有发现回收率与水之间的相关性。模拟值。在其他波长下获得更好的结果。随着叶绿素a浓度的降低和黄色物质吸收的增加，估算遥感反射率R35的准确性降低，范围在±7％至±47％之间。 R35不确定性在叶绿素上的传播估计值被量化。保持相同的大气水条件，大气校正方案似乎对太阳天顶的季节变化敏感。

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