Optical water types found in Brazilian waters

Author(s)

da Silva, Edson Filisbino Freire ^[1] ; Novo, Evlyn Marcia Leao de Moraes ^[1] ; Lobo, Felipe de Lucia ^[2] ; Barbosa, Claudio Clemente Faria ^[3] ; Noernberg, Mauricio Almeida ^[4] ; Rotta, Luiz Henrique da Silva ^[5] ; Cairo, Carolline Tressmann ^[3] ; Maciel, Daniel Andrade ^[3] ; Flores Junior, Rogerio ^[3]

Affiliation

^[1] Natl Inst Space Res, Remote Sensing Div, Sao Jose Dos Campos - Brazil

^[2] Univ Fed Pelotas, CDTec, Pelotas, RS - Brazil

^[3] Natl Inst Space Res, Image Proc Div, Sao Jose Dos Campos - Brazil

^[4] Univ Fed Parana, Ctr Marine Studies, Pontal Do Parana - Brazil

^[5] Sao Paulo State Univ, Dept Cartog, Presidente Prudente - Brazil

• Document type: Journal article
• Source: LIMNOLOGY; v. 22, n. 1 JUL 2020.
• Web of Science Citations: 0

Abstract

Optical water types (OWTs) can represent diverse ranges of Chlorophyll-a (Chl-a), total suspended matter (TSM), and colored dissolved organic matter (CDOM) concentrations, which make them extremely useful for monitoring water quality, for example, detecting eutrophic conditions or tuning remote sensing algorithms. In this study, the objective is to assess OWTs found in Brazilian waters using in situ remote sensing reflectance (R-rs), acquired for water bodies encompassing a wide range of optical characteristics. Eight OWTs are obtained based on R-rs spectral shape and magnitude, which represent different limnological characteristics of Brazilian waters. The OWT 1 is clear waters with low TSM, Chl-a, and CDOM (median ((x) over tilde): TSM of 2.64 g m(-3), Chl-a of 6.04 mg m(-3), and CDOM of 0.6 m(-1)); OWT 2 represents moderate turbid waters (TSM (x) over tilde: 5.14); OWTs 3, 4, and 5 are characterized by waters with high Chl-a concentration ((x) over tilde: 33.1, 39.6, and 180.4 mg m(-3), respectively); OWT 6 is characterized with the highest CDOM concentration ((x) over tilde: 4.07 m(-1)); OWTs 7 and 8 consist of waters with the highest TSM concentrations from terrestrial input ((x) over tilde: 19.55 and 93.25, respectively). Hence, those OWTs could support satellite monitoring by helping to tune algorithms and also providing wide spatial-temporal monitoring. (AU)

• FAPESP's process: 13/09045-7 - Submersed aquatic vegetation - SAV mapping based on radiative transfer theory - RTT in water bodies
• Grantee: Nilton Nobuhiro Imai
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/23903-9 - Bio-optical spatio-temporal characterization and development of analytical algorithms for the systematic monitoring of water masses circulating on the floodplain of medium and lower Amazon
• Grantee: Cláudio Clemente Faria Barbosa
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/19821-1 - Bio-optical model parametrization to study the chlorophyll-A concentration along a cascade of reservoirs
• Grantee: Enner Herenio de Alcântara
• Support Opportunities: Regular Research Grants
• FAPESP's process: 08/56252-0 - Environmental and socioeconomic impacts associated with the production and consumption of sugarcane ethanol in south central Brazil
• Grantee: Evlyn Márcia Leão de Moraes Novo
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants