Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters
The Abrolhos Bank harbors the richest coral reef ecosystem in the South Atlantic Ocean. It exhibits unique geomorphologic structures, is localized in shallow depths, and is divided into two reef regions with an inner arc close to the coast (3–20 m depth) and an outer deeper arc (5–30 m depth). This...
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crfrontiers:10.3389/frsen.2022.986013 2024-10-13T14:10:48+00:00 Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters Medeiros, Thais Andrade Galvão Zoffoli, María Laura Frouin, Robert Cortivo, Fábio Dall Cesar, Gabriel Moiano Kampel, Milton 2022 http://dx.doi.org/10.3389/frsen.2022.986013 https://www.frontiersin.org/articles/10.3389/frsen.2022.986013/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Remote Sensing volume 3 ISSN 2673-6187 journal-article 2022 crfrontiers https://doi.org/10.3389/frsen.2022.986013 2024-10-01T04:02:28Z The Abrolhos Bank harbors the richest coral reef ecosystem in the South Atlantic Ocean. It exhibits unique geomorphologic structures, is localized in shallow depths, and is divided into two reef regions with an inner arc close to the coast (3–20 m depth) and an outer deeper arc (5–30 m depth). This study aims to describe some bio-optical properties of the Abrolhos Bank waters and to evaluate the performance of the inversion Hyperspectral Optimization Processing Exemplar (HOPE) model, developed to retrieve optical properties in shallow waters, in the region. To this end, measurements at 75 stations during two field campaigns conducted during the 2013 and 2016 wet seasons were analyzed, and the HOPE model was applied to both in situ remote sensing reflectance ( R rs ) spectra and PRecursore IperSpettrale della Missione Applicativa (PRISMA) imagery. Significant differences in optical and biological properties were found between the two arcs. The empirical relationships between chlorophyll- a concentration (Chl- a ) and absorption coefficient of phytoplankton at 440 nm ( a phy (440)) diverged from Bricaud’s models, suggesting differences in phytoplankton diversity and cell size. In both arcs, total non-water absorption coefficient at 440 nm ( a T-w (440)) was dominated by colored dissolved organic matter (CDOM) by ∼60%. Absorption coefficient by CDOM ( a cdom ) presented a higher variability within the outer arc, with the lowest contribution from non-algal particles (NAPs), and the spectral slopes of a CDOM resembled those of the inner arc. The spectral slopes of the NAP absorption coefficient suggested a dominance by organic rather than mineral particles that probably originated from biological production. The HOPE model applied to in situ R rs performed satisfactorily for depth in the Abrolhos Bank waters, although retrievals of a phy (440), CDOM plus NAP ( a dg (440)) and a T-w (440) were underestimated with a relative bias of −27.9%, −32.1% and −45.8%, respectively. The HOPE model retrievals from the PRISMA ... Article in Journal/Newspaper South Atlantic Ocean Frontiers (Publisher) Prisma ENVELOPE(-58.767,-58.767,-69.200,-69.200) Frontiers in Remote Sensing 3 |
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Frontiers (Publisher) |
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description |
The Abrolhos Bank harbors the richest coral reef ecosystem in the South Atlantic Ocean. It exhibits unique geomorphologic structures, is localized in shallow depths, and is divided into two reef regions with an inner arc close to the coast (3–20 m depth) and an outer deeper arc (5–30 m depth). This study aims to describe some bio-optical properties of the Abrolhos Bank waters and to evaluate the performance of the inversion Hyperspectral Optimization Processing Exemplar (HOPE) model, developed to retrieve optical properties in shallow waters, in the region. To this end, measurements at 75 stations during two field campaigns conducted during the 2013 and 2016 wet seasons were analyzed, and the HOPE model was applied to both in situ remote sensing reflectance ( R rs ) spectra and PRecursore IperSpettrale della Missione Applicativa (PRISMA) imagery. Significant differences in optical and biological properties were found between the two arcs. The empirical relationships between chlorophyll- a concentration (Chl- a ) and absorption coefficient of phytoplankton at 440 nm ( a phy (440)) diverged from Bricaud’s models, suggesting differences in phytoplankton diversity and cell size. In both arcs, total non-water absorption coefficient at 440 nm ( a T-w (440)) was dominated by colored dissolved organic matter (CDOM) by ∼60%. Absorption coefficient by CDOM ( a cdom ) presented a higher variability within the outer arc, with the lowest contribution from non-algal particles (NAPs), and the spectral slopes of a CDOM resembled those of the inner arc. The spectral slopes of the NAP absorption coefficient suggested a dominance by organic rather than mineral particles that probably originated from biological production. The HOPE model applied to in situ R rs performed satisfactorily for depth in the Abrolhos Bank waters, although retrievals of a phy (440), CDOM plus NAP ( a dg (440)) and a T-w (440) were underestimated with a relative bias of −27.9%, −32.1% and −45.8%, respectively. The HOPE model retrievals from the PRISMA ... |
format |
Article in Journal/Newspaper |
author |
Medeiros, Thais Andrade Galvão Zoffoli, María Laura Frouin, Robert Cortivo, Fábio Dall Cesar, Gabriel Moiano Kampel, Milton |
spellingShingle |
Medeiros, Thais Andrade Galvão Zoffoli, María Laura Frouin, Robert Cortivo, Fábio Dall Cesar, Gabriel Moiano Kampel, Milton Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
author_facet |
Medeiros, Thais Andrade Galvão Zoffoli, María Laura Frouin, Robert Cortivo, Fábio Dall Cesar, Gabriel Moiano Kampel, Milton |
author_sort |
Medeiros, Thais Andrade Galvão |
title |
Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
title_short |
Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
title_full |
Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
title_fullStr |
Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
title_full_unstemmed |
Bio-optical properties of the Brazilian Abrolhos Bank’s shallow coral-reef waters |
title_sort |
bio-optical properties of the brazilian abrolhos bank’s shallow coral-reef waters |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/frsen.2022.986013 https://www.frontiersin.org/articles/10.3389/frsen.2022.986013/full |
long_lat |
ENVELOPE(-58.767,-58.767,-69.200,-69.200) |
geographic |
Prisma |
geographic_facet |
Prisma |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Frontiers in Remote Sensing volume 3 ISSN 2673-6187 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/frsen.2022.986013 |
container_title |
Frontiers in Remote Sensing |
container_volume |
3 |
_version_ |
1812818304321978368 |