FN Archimer Export Format PT J TI From In Situ to satellite observations of pelagic Sargassum distribution and aggregation in the Tropical North Atlantic Ocean BT AF 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 AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;8:1;9:1;10:2;11:2;12:3;13:1;14:4;15:5;16:3;17:6;18:1;19:1;20:1;21:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:;21:; C1 Aix-Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, Marseille, France Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer (IUEM), LEMAR UMR 6539, Technopôle Brest-Iroise, Plouzané, France IRD DR-OUEST, US191 IMAGO, Technopole de Brest-Iroise—Site de la Pointe du Diable, Plouzané, France Université des Antilles, UMR BOREA, Campus de Fouillole, BP 592, Pointe-à-Pitre, Guadeloupe, France IRD, IRD-Images, Marseille, France Aix Marseille Univ, CNRS, IRD, IRSTEA, OSU PYTHEAS, Marseille, France C2 UNIV AIX MARSEILLE, FRANCE UBO, FRANCE IRD, FRANCE UNIV ANTILLES, FRANCE IRD, FRANCE UNIV AIX MARSEILLE, FRANCE UM LEMAR IN WOS Cotutelle UMR DOAJ copubli-france copubli-univ-france IF 2.74 TC 61 UR 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 LA English DT Article CR SARGASSES CARAIBES SARGASSES TRANSATLANTIQUE BO Antea AB 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. PY 2019 PD SEP SO Plos One SN 1932-6203 PU Public Library of Science (PLoS) VL 14 IS 9 UT 000532231400030 DI 10.1371/journal.pone.0222584 ID 62609 ER EF