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An Enhanced Three-Band Index for Estimating Chlorophyll-a in Turbid Case-II Waters: Case Studies of Lake Kasumigaura, Japan, and Lake Dianchi, China

机译:在浑浊的案例II水域中估算叶绿素a的增强三波段指数:日本霞浦湖和中国滇池的案例研究

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摘要

A three-band index was previously proposed and successfully utilized to estimate the chlorophyll-a concentration (Chl-a) in case-II waters. However, this index shows uncertainties in highly turbid situations. In this study, an enhanced three-band index is proposed to solve this problem. Since the new index employs bands that are identical to those of the original threeband index, it can be applied to Medium Resolution Imaging Spectrometer (MERIS) data. The performance of the index was evaluated using the data collected from two turbid Asian lakes: Lake Kasumigaura, Japan, and Lake Dianchi, China. The results showed that the Chl-a predicted by the enhanced threeband index was strongly correlated with the measured Chl-a (R2 > 0.83), and the root-mean-square error (rmse) and the normalized root-mean-square error (NRMS) were both reduced for the two lakes (for Lake Kasumigaura, rmse from 13.97 to 8.68 mg · m-3 and NRMS from 19.01% to 12.30%; for Lake Dianchi, rmse from 41.29 to 15.28 mg · m-3 and NRMS from 35.83% to 21.34%). These findings imply that, if accurately atmospheric-corrected MERIS data are available, the enhanced three-band index could be used for mapping Chl-a even in highly turbid case-II waters.
机译:先前提出了一个三波段指数,并成功地用于估算案例II水域中的叶绿素a浓度(Ch1-a)。但是,该指数在高度混浊的情况下显示出不确定性。在这项研究中,提出了一种增强的三波段指数来解决这个问题。由于新索引使用的频段与原始三频段索引的频段相同,因此可以将其应用于中分辨率成像光谱仪(MERIS)数据。使用从两个浑浊的亚洲湖泊(日本霞浦湖和中国滇池湖)收集的数据对指数的性能进行了评估。结果表明,增强的三带指数预测的Chl-a与测得的Chl-a(R2> 0.83)以及均方根误差(rmse)和归一化均方根误差(两个湖泊的NRMS均降低(对于霞浦浦湖,均方根值从13.97降低到8.68 mg·m-3,NRMS从19.01%降低到12.30%;对于滇池,均方根值从41.29降低到15.28 mg·m-3和NRMS。 35.83%至21.34%)。这些发现暗示,如果可获得准确的经大气校正的MERIS数据,即使在高度混浊的II类水域中,增强的三波段指数也可用于测绘Chl-a。

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