Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations
The kd(490) is a vertical light attenuation coefficient and an important parameter for water quality. The kd 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...
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doaj-ff0941ccb01a4194b81298fd007a260b2020-11-24T21:08:11ZengMDPI AGRemote Sensing2072-42922018-07-01107106310.3390/rs10071063rs10071063Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a ConcentrationsAna Carolina Campos Gomes0Nariane Bernardo1Alisson Coelho do Carmo2Thanan Rodrigues3Enner Alcântara4Department of Cartography, São Paulo State University (Unesp), Presidente Prudente 9060-900, BrazilDepartment of Cartography, São Paulo State University (Unesp), Presidente Prudente 9060-900, BrazilDepartment of Cartography, São Paulo State University (Unesp), Presidente Prudente 9060-900, BrazilFederal Institute for Education, Science and Technology of Pará State, Castanhal 687040-970, BrazilDepartment of Environmental Engineering, São Paulo State University (Unesp), São José dos Campos 12247-004, BrazilThe kd(490) is a vertical light attenuation coefficient and an important parameter for water quality. The kd 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 kd(490) in an environment dominated by CDOM. Similar failures occurred with the models using the Chl-a concentration (MAPE ~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 kd(490) using the semi-analytical model, seasonal patterns were observed, and high values of kd(490) were detected in the dry season possibly due to the increase of the concentration of the optically-significant substances (OSS).http://www.mdpi.com/2072-4292/10/7/1063light attenuationbio-optical modelssatellite imageswater quality |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ana Carolina Campos Gomes Nariane Bernardo Alisson Coelho do Carmo Thanan Rodrigues Enner Alcântara |
spellingShingle |
Ana Carolina Campos Gomes Nariane Bernardo Alisson Coelho do Carmo Thanan Rodrigues Enner Alcântara Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations Remote Sensing light attenuation bio-optical models satellite images water quality |
author_facet |
Ana Carolina Campos Gomes Nariane Bernardo Alisson Coelho do Carmo Thanan Rodrigues Enner Alcântara |
author_sort |
Ana Carolina Campos Gomes |
title |
Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations |
title_short |
Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations |
title_full |
Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations |
title_fullStr |
Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations |
title_full_unstemmed |
Diffuse Attenuation Coefficient Retrieval in CDOM Dominated Inland Water with High Chlorophyll-a Concentrations |
title_sort |
diffuse attenuation coefficient retrieval in cdom dominated inland water with high chlorophyll-a concentrations |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2018-07-01 |
description |
The kd(490) is a vertical light attenuation coefficient and an important parameter for water quality. The kd 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 kd(490) in an environment dominated by CDOM. Similar failures occurred with the models using the Chl-a concentration (MAPE ~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 kd(490) using the semi-analytical model, seasonal patterns were observed, and high values of kd(490) were detected in the dry season possibly due to the increase of the concentration of the optically-significant substances (OSS). |
topic |
light attenuation bio-optical models satellite images water quality |
url |
http://www.mdpi.com/2072-4292/10/7/1063 |
work_keys_str_mv |
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