Operational MERIS-based NIR-red algorithms for estimating chlorophyll-a concentrations in coastal waters 鈥?The Azov Sea case study

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• 作者：Wesley J. Moses^a ; ^{wesley.moses.ctr.in@nrl.navy.mil} ; Anatoly A. Gitelson^b ; ^{agitelson2@unl.edu} ; Sergey Berdnikov^c ; ^{berdnikov@ssc-ras.ru} ; Vladislav Saprygin^c ; ^{saprygin@ssc-ras.ru} ; Vasily Povazhnyi^c ; ^{povazhny@mmbi.krinc.ru}
• 关键词：Remote sensing ; Chlorophyll-a ; Turbid productive waters ; NIR-red ; MERIS ; Operational algorithms
• 刊名：Remote Sensing of Environment
• 出版年：2012
• 期刊代码：79_00344257
• 类别：ear
• 出版时间：June, 2012
• 卷：121
• 期：Complete
• 页码：118-124
• 文件大小：814 K

摘要

We present here results that strongly support the use of MERIS-based NIR-red algorithms as standard tools for estimating chlorophyll-a (chl-a) concentration in turbid productive waters. The study was carried out as one of the steps in testing the potential of the universal applicability of previously developed NIR-red algorithms, which were earlier calibrated using a limited set of MERIS imagery and in situ data from the Azov Sea and the Taganrog Bay, Russia, and data that were synthetically generated using a radiative transfer model. We used an extensive set of MERIS imagery and in situ data collected over a period of three years in the Azov Sea and the Taganrog Bay for this validation task. We found that the two-band and three-band NIR-red algorithms gave consistently highly accurate estimates of chl-a concentration, with a mean absolute error of 4.32 mg m^鈭?#xA0;3 and 4.71 mg m^鈭?#xA0;3, respectively, and a root mean square error as low as 5.92 mg m^鈭?#xA0;3, for data with chl-a concentrations ranging from 1.09 mg m^鈭?#xA0;3 to 107.82 mg m^鈭?#xA0;3. This obviates the need for case-specific reparameterization of the algorithms, as long as the specific absorption coefficient of phytoplankton in the water does not change drastically, and presents a strong case for the use of NIR-red algorithms as standard algorithms that can be routinely applied for near-real-time quantitative monitoring of chl-a concentration in the Azov Sea and the Taganrog Bay, and potentially elsewhere, which will be a real boon to ecologists, natural resource managers and environmental decision-makers.