From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean
The present study reports on observations carried out in the Tropical North Atlantic in summer and autumn 2017, documenting Sargassum aggregations using both ship-deck observations and satellite sensor observations at three resolutions (MSI-10 m, OLCI-300 m, VIIRS-750 m and MODIS-1 km). Both dataset...
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Language: | English |
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Public Library of Science (PLoS)
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Online Access: | https://archimer.ifremer.fr/doc/00514/62609/66969.pdf https://archimer.ifremer.fr/doc/00514/62609/66970.tif https://archimer.ifremer.fr/doc/00514/62609/66971.pdf https://archimer.ifremer.fr/doc/00514/62609/66972.pdf https://archimer.ifremer.fr/doc/00514/62609/66973.tif https://doi.org/10.1371/journal.pone.0222584 https://archimer.ifremer.fr/doc/00514/62609/ |
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ftarchimer:oai:archimer.ifremer.fr:62609 2023-05-15T17:31:35+02:00 From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean Ody, Anouck Thibaut, Thierry Berline, Léo Changeux, Thomas André, Jean-michel Chevalier, Cristèle Blanfuné, Aurélie Blanchot, Jean Ruitton, Sandrine Stiger-pouvreau, Valerie Connan, Solène Grelet, Jacques Aurelle, Didier Guéné, Mathilde Bataille, Hubert Bachelier, Celine Guillemain, Dorian Schmidt, Natascha Fauvelle, Vincent Guasco, Sophie Ménard, Frédéric 2019-09 application/pdf https://archimer.ifremer.fr/doc/00514/62609/66969.pdf https://archimer.ifremer.fr/doc/00514/62609/66970.tif https://archimer.ifremer.fr/doc/00514/62609/66971.pdf https://archimer.ifremer.fr/doc/00514/62609/66972.pdf https://archimer.ifremer.fr/doc/00514/62609/66973.tif https://doi.org/10.1371/journal.pone.0222584 https://archimer.ifremer.fr/doc/00514/62609/ eng eng Public Library of Science (PLoS) https://archimer.ifremer.fr/doc/00514/62609/66969.pdf https://archimer.ifremer.fr/doc/00514/62609/66970.tif https://archimer.ifremer.fr/doc/00514/62609/66971.pdf https://archimer.ifremer.fr/doc/00514/62609/66972.pdf https://archimer.ifremer.fr/doc/00514/62609/66973.tif doi:10.1371/journal.pone.0222584 https://archimer.ifremer.fr/doc/00514/62609/ info:eu-repo/semantics/openAccess restricted use Plos One (1932-6203) (Public Library of Science (PLoS)), 2019-09 , Vol. 14 , N. 9 , P. e0222584 (29p.) text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1371/journal.pone.0222584 2021-09-23T20:33:28Z The present study reports on observations carried out in the Tropical North Atlantic in summer and autumn 2017, documenting Sargassum aggregations using both ship-deck observations and satellite sensor observations at three resolutions (MSI-10 m, OLCI-300 m, VIIRS-750 m and MODIS-1 km). Both datasets reported that in summer, Sargassum aggregations were mainly observed off Brazil and near the Caribbean Islands, while they accumulated near the African coast in autumn. Based on in situ observations, we propose a five-class typology allowing standardisation of the description of in situ Sargassum raft shapes and sizes. The most commonly observed Sargassum raft type was windrows, but large rafts composed of a quasi-circular patch hundreds of meters wide were also observed. Satellite imagery showed that these rafts formed larger Sargassum aggregations over a wide range of scales, with smaller aggregations (of tens of m2 area) nested within larger ones (of hundreds of km2). Match-ups between different satellite sensors and in situ observations were limited for this dataset, mainly because of high cloud cover during the periods of observation. Nevertheless, comparisons between the two datasets showed that satellite sensors successfully detected Sargassum abundance and aggregation patterns consistent with in situ observations. MODIS and VIIRS sensors were better suited to describing the Sargassum aggregation distribution and dynamics at Atlantic scale, while the new sensors, OLCI and MSI, proved their ability to detect Sargassum aggregations and to describe their (sub-) mesoscale nested structure. The high variability in raft shape, size, thickness, depth and biomass density observed in situ means that caution is called for when using satellite maps of Sargassum distribution and biomass estimation. Improvements would require additional in situ and airborne observations or very high-resolution satellite imagery. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) PLOS ONE 14 9 e0222584 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The present study reports on observations carried out in the Tropical North Atlantic in summer and autumn 2017, documenting Sargassum aggregations using both ship-deck observations and satellite sensor observations at three resolutions (MSI-10 m, OLCI-300 m, VIIRS-750 m and MODIS-1 km). Both datasets reported that in summer, Sargassum aggregations were mainly observed off Brazil and near the Caribbean Islands, while they accumulated near the African coast in autumn. Based on in situ observations, we propose a five-class typology allowing standardisation of the description of in situ Sargassum raft shapes and sizes. The most commonly observed Sargassum raft type was windrows, but large rafts composed of a quasi-circular patch hundreds of meters wide were also observed. Satellite imagery showed that these rafts formed larger Sargassum aggregations over a wide range of scales, with smaller aggregations (of tens of m2 area) nested within larger ones (of hundreds of km2). Match-ups between different satellite sensors and in situ observations were limited for this dataset, mainly because of high cloud cover during the periods of observation. Nevertheless, comparisons between the two datasets showed that satellite sensors successfully detected Sargassum abundance and aggregation patterns consistent with in situ observations. MODIS and VIIRS sensors were better suited to describing the Sargassum aggregation distribution and dynamics at Atlantic scale, while the new sensors, OLCI and MSI, proved their ability to detect Sargassum aggregations and to describe their (sub-) mesoscale nested structure. The high variability in raft shape, size, thickness, depth and biomass density observed in situ means that caution is called for when using satellite maps of Sargassum distribution and biomass estimation. Improvements would require additional in situ and airborne observations or very high-resolution satellite imagery. |
format |
Article in Journal/Newspaper |
author |
Ody, Anouck Thibaut, Thierry Berline, Léo Changeux, Thomas André, Jean-michel Chevalier, Cristèle Blanfuné, Aurélie Blanchot, Jean Ruitton, Sandrine Stiger-pouvreau, Valerie Connan, Solène Grelet, Jacques Aurelle, Didier Guéné, Mathilde Bataille, Hubert Bachelier, Celine Guillemain, Dorian Schmidt, Natascha Fauvelle, Vincent Guasco, Sophie Ménard, Frédéric |
spellingShingle |
Ody, Anouck Thibaut, Thierry Berline, Léo Changeux, Thomas André, Jean-michel Chevalier, Cristèle Blanfuné, Aurélie Blanchot, Jean Ruitton, Sandrine Stiger-pouvreau, Valerie Connan, Solène Grelet, Jacques Aurelle, Didier Guéné, Mathilde Bataille, Hubert Bachelier, Celine Guillemain, Dorian Schmidt, Natascha Fauvelle, Vincent Guasco, Sophie Ménard, Frédéric From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
author_facet |
Ody, Anouck Thibaut, Thierry Berline, Léo Changeux, Thomas André, Jean-michel Chevalier, Cristèle Blanfuné, Aurélie Blanchot, Jean Ruitton, Sandrine Stiger-pouvreau, Valerie Connan, Solène Grelet, Jacques Aurelle, Didier Guéné, Mathilde Bataille, Hubert Bachelier, Celine Guillemain, Dorian Schmidt, Natascha Fauvelle, Vincent Guasco, Sophie Ménard, Frédéric |
author_sort |
Ody, Anouck |
title |
From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
title_short |
From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
title_full |
From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
title_fullStr |
From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
title_full_unstemmed |
From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean |
title_sort |
from in situ to satellite observations of pelagic sargassum distribution and aggregation in the tropical north atlantic ocean |
publisher |
Public Library of Science (PLoS) |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00514/62609/66969.pdf https://archimer.ifremer.fr/doc/00514/62609/66970.tif https://archimer.ifremer.fr/doc/00514/62609/66971.pdf https://archimer.ifremer.fr/doc/00514/62609/66972.pdf https://archimer.ifremer.fr/doc/00514/62609/66973.tif https://doi.org/10.1371/journal.pone.0222584 https://archimer.ifremer.fr/doc/00514/62609/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Plos One (1932-6203) (Public Library of Science (PLoS)), 2019-09 , Vol. 14 , N. 9 , P. e0222584 (29p.) |
op_relation |
https://archimer.ifremer.fr/doc/00514/62609/66969.pdf https://archimer.ifremer.fr/doc/00514/62609/66970.tif https://archimer.ifremer.fr/doc/00514/62609/66971.pdf https://archimer.ifremer.fr/doc/00514/62609/66972.pdf https://archimer.ifremer.fr/doc/00514/62609/66973.tif doi:10.1371/journal.pone.0222584 https://archimer.ifremer.fr/doc/00514/62609/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1371/journal.pone.0222584 |
container_title |
PLOS ONE |
container_volume |
14 |
container_issue |
9 |
container_start_page |
e0222584 |
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1766129240090083328 |