Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations

Autor(es)

Campos Gomes, Ana Carolina ^[1] ; Bernardo, Nariane ^[1] ; do Carmo, Alisson Coelho ^[1] ; Rodrigues, Thanan ^[2] ; Alcantara, Enner ^[3]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Dept Cartog, BR-9060900 Presidente Prudente - Brazil

^[2] Fed Inst Educ Sci & Technol Para State, BR-68704097 Castanhal - Brazil

^[3] Sao Paulo State Univ Unesp, Dept Environm Engn, BR-12247004 Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REMOTE SENSING; v. 10, n. 7 JUL 2018.
• Citações Web of Science: 2

Resumo

The k(d)(490) is a vertical light attenuation coefficient and an important parameter for water quality. The k(d) estimates are often based on empirical and semi-analytical algorithms, designed for oceanic and coastal waters. However, there is a lack of information about the performances of these models to inland waters dominated by chromophoric dissolved organic matter (CDOM). Therefore, to contribute to this investigation, nine empirical models based on the blue-to-green and blue-to-red ratios and chlorophyll-a (Chl-a) concentration were evaluated, as well as three semi-analytical models using bands from the Operational Land Imager (OLI)/Landsat-8. The errors (mean absolute percentage error, MAPE > 80%) presented by the empirical models confirmed that the blue-to-green ratio failed in retrieving k(d)(490) in an environment dominated by CDOM. Similar failures occurred with the models using the Chl-a concentration (MAPE similar to 60%) as input. A semi-analytical approach showed the lowest error (MAPE = 41.04%) in the estimate of the inherent optical properties for complex waters in order to reduce the errors above. After retrieval of k(d)(490) using the semi-analytical model, seasonal patterns were observed, and high values of k(d)(490) were detected in the dry season possibly due to the increase of the concentration of the optically-significant substances (OSS). (AU)

• Processo FAPESP: 15/21586-9 - Re-parametrização do algoritmo quase-analítico (QAA) para estimativa das propriedades ópticas inerentes nos reservatórios do Rio Tietê
• Beneficiário: Enner Herenio de Alcântara
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/19821-1 - Parametrização de modelo bio-óptico para o estudo da concentração de clorofila-A ao longo de reservatórios em cascata
• Beneficiário: Enner Herenio de Alcântara
• Modalidade de apoio: Auxílio à Pesquisa - Regular