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

REMOTE SENSING OF ENVIRONMENT

卷:121

Article

Moses, Wesley J.²  Gitelson, Anatoly A.¹  Berdnikov, Sergey³  Saprygin, Vladislav³  Povazhnyi, Vasily³ 

[1] Univ Nebraska, Ctr Adv Land Management Informat Technol, Lincoln, NE 68583 USA

[2] USN, Natl Res Council, Res Lab, Washington, DC USA

[3] Russian Acad Sci, So Sci Ctr, Rostov Na Donu, Russia

关键词: Remote sensing;    Chlorophyll-a;    Turbid productive waters;    NIR-red;    MERIS;    Operational algorithms;   

DOI  :  10.1016/j.rse.2012.01.024

来源: Elsevier

【 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(-3) and 4.71 mg m(-3), respectively, and a root mean square error as low as 5.92 mg m(-3), for data with chl-a concentrations ranging from 1.09 mg m(-3) to 107.82 mg m(-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. (c) 2012 Elsevier Inc. All rights reserved.

【 授权许可】

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