An investigation into the phytoplankton package effect on the chlorophyll-a specific absorption coefficient in Barra Bonita reservoir, Brazil

Author(s)

Alcantara, Enner ^[1] ; Watanabe, Fernanda ^[1] ; Rodrigues, Thanan ^[1] ; Bernardo, Nariane ^[1]

Affiliation

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

• Document type: Journal article
• Source: REMOTE SENSING LETTERS; v. 7, n. 8, p. 761-770, AUG 2016.
• Web of Science Citations: 8

Abstract

In this article, a possible phytoplankton package effect on the chlorophyll-a specific absorption coefficient (a{*}(phy)) is investigated. Two fieldworks were conducted in May and October 2014 in Barra Bonita (BB) reservoir. During the fieldworks, radiometric and water samples were obtained. From the radiometric data, the remote sensing reflectance (R-rs) were calculated and from the water samples the chlorophyll-a (chl-a) concentration, the phytoplankton absorption coefficient (a(phy)) and a{*}(phy) coefficient were obtained. The results show that for the first fieldwork (in May), the package effect was less perceived than in the second fieldwork (in October). In May, the package effect was more pronounced for the highest chl-a concentration (>200mgm(-3)) and for October all samples ranging from 263.20 to 797.80mgm(-3) were effected. Due to this effect, the bio-optical model development in order to estimate the chl-a concentration in a eutrophic environment such as the BB reservoir will face higher errors when the chl-a concentration were higher than 300mgm(-3). (AU)

• FAPESP's process: 15/21586-9 - Re-parametrization of a Quasi-Analytical Algorithm (QAA) to estimating the inherent optical properties in reservoirs of Tietê River
• Grantee: Enner Herenio de Alcântara
• 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