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- Title
An improved three-band semi-analytical algorithm for estimating chlorophyll- a concentration in highly turbid coastal waters: a case study of the Yellow River estuary, China.
- Authors
Chen, Jun; Quan, Wenting; Wen, Zhenhe; Cui, Tingwei
- Abstract
An improved three-band semi-analytical algorithm was developed for improving the performance of the three- and four-band algorithms, for chlorophyll- a concentration retrievals in the highly turbid waters of the Yellow River estuary. In this special case study of the Yellow River estuary, the optimal wavelengths of the improved three-band semi-analytical algorithm must meet the following requirements: the λ and λ must be restricted to within the range 660-690 nm, and the λ must be longer than 750 nm. The algorithm calibration and validation results indicate that the improved three-band algorithm indeed produces superior performance in comparison to both the three- and four-band algorithms in retrieving chlorophyll- a concentration from the extremely coastal waters of the Yellow River estuary. Comparing the improved three-band algorithm to the original three- and four-band algorithm, the former minimizes the influence of backscattering by suspended solids in near-infrared regions, while the three-band algorithm has a much stronger error tolerance ability than the four-band algorithm. These findings imply that if an atmospheric correction scheme for visible and near-infrared bands is available, the improved three-band algorithm may be used for quantitative monitoring of chlorophyll- a concentration in turbid coastal waters with similar bio-optical properties, although some local bio-optical information or improved models may be required to reposition the optimal band positions of the algorithm.
- Subjects
YELLOW River Estuary (China); ALGORITHMS; WAVELENGTHS; TERRITORIAL waters; SUSPENDED solids
- Publication
Environmental Earth Sciences, 2013, Vol 69, Issue 8, p2709
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-012-2093-1