{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T06:40:56Z","timestamp":1773470456655,"version":"3.50.1"},"reference-count":97,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T00:00:00Z","timestamp":1698710400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"PROOF FLUPAC"},{"name":"GOPS"},{"name":"ANR OUTPACE"},{"name":"INSU PNTS"},{"name":"INSU EC2CO"},{"name":"LEFE CYBER GLI-FI GLIder in FIji"},{"name":"ReefTEMPS"},{"name":"OSU PYTHEAS"},{"name":"IRD"},{"name":"Centre de Recherche pour le Nickel et son Environment (CNRT)"},{"name":"Ocean by Satellite Methods Exchanges in the Tropical Environment project (COMETE)"},{"name":"National Aeronautics and Space Administration"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The oceanic waters of the Southwest Tropical Pacific occupy a vast region including multiple Pacific Island Countries. The state of these waters is determinant for fisheries and the blue economy. Ocean color remote sensing is the main tool to survey the variability and long-term evolution of these large areas that are important for economic development but are affected by climate change. Unlike vast oligotrophic gyres, tropical waters are characterized by numerous archipelagos and islands, with deep and shallow lagoons subjected to the large impacts of the land. Strikingly large dendritic phytoplankton (Trichodesmium) blooms with high levels of chlorophyll, developing within archipelagos, as well as coastal enrichments from various origins may be observed. Algorithms to detect the presence of Trichodesmium have been developed or adapted, as well as algorithms to estimate the chlorophyll concentration ([Chl-a)]. Adapting existing [Chl-a] algorithms does not always yield high, i.e., sufficient, accuracy. A review of published regional bio-optical algorithms developed taking into account the specific phytoplankton composition and minimizing the adverse impacts of particles and the seabed bottom on [Chl-a] determination is presented, as well the bio-optical database that allowed their development. The interest of such algorithms for a variety of applications and scientific accomplishments is highlighted, with a view to further addressing the main biology and biogeochemistry questions, e.g., to determine the true impact of diazotrophs and assess lagoon [Chl-a] variability with the highest confidence. This work anticipates the use of future coarse and high-spatial-resolution and multi- and hyper-spectral satellite imagery in the Pacific.<\/jats:p>","DOI":"10.3390\/rs15215194","type":"journal-article","created":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T12:48:31Z","timestamp":1698756511000},"page":"5194","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["A Review of Ocean Color Algorithms to Detect Trichodesmium Oceanic Blooms and Quantify Chlorophyll Concentration in Shallow Coral Lagoons of South Pacific Archipelagos"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2246-918X","authenticated-orcid":false,"given":"C\u00e9cile","family":"Dupouy","sequence":"first","affiliation":[{"name":"Aix-Marseille Universit\u00e9, Universit\u00e9 de Toulon, IRD, CNRS\/INSU, Mediterranean Institute of Oceanography, MIO UM 110, 13288 Marseille, France"},{"name":"Pacific Centre for Environment and Sustainable Development (PaCE-SD), The University of the South Pacific, Laucala Campus, Suva, Fiji"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2856-0574","authenticated-orcid":false,"given":"Andra","family":"Whiteside","sequence":"additional","affiliation":[{"name":"Aix-Marseille Universit\u00e9, Universit\u00e9 de Toulon, IRD, CNRS\/INSU, Mediterranean Institute of Oceanography, MIO UM 110, 13288 Marseille, France"},{"name":"Pacific Centre for Environment and Sustainable Development (PaCE-SD), The University of the South Pacific, Laucala Campus, Suva, Fiji"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9021-6873","authenticated-orcid":false,"given":"Jing","family":"Tan","sequence":"additional","affiliation":[{"name":"Scripps Institution of Oceanography, University of California San Diego, 8810 Shellback Way, La Jolla, CA 92093, USA"}]},{"given":"Guillaume","family":"Wattelez","sequence":"additional","affiliation":[{"name":"Interdisciplinary Laboratory for Research in Education, EA 7483, University of New Caledonia, Avenue James Cook, Noum\u00e9a 98800, New Caledonia"}]},{"given":"Hiroshi","family":"Murakami","sequence":"additional","affiliation":[{"name":"Japan Aerospace Exploration Agency, Tsukuba 305-8505, Ibaraki, Japan"}]},{"given":"R\u00e9mi","family":"Andr\u00e9oli","sequence":"additional","affiliation":[{"name":"Bluecham SAS, Noum\u00e9a 98848, New Caledonia"}]},{"given":"J\u00e9r\u00f4me","family":"Lef\u00e8vre","sequence":"additional","affiliation":[{"name":"ENTROPIE, Centre IRD de Noum\u00e9a, BP A5, Noum\u00e9a 98848, New Caledonia"}]},{"given":"R\u00fcdiger","family":"R\u00f6ttgers","sequence":"additional","affiliation":[{"name":"Institute of Carbon Cycles, Helmholtz-Zentrum HEREON, Max-Planck-Str. 1, Building 70, D-21502 Geesthacht, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5341-0703","authenticated-orcid":false,"given":"Awnesh","family":"Singh","sequence":"additional","affiliation":[{"name":"Pacific Centre for Environment and Sustainable Development (PaCE-SD), The University of the South Pacific, Laucala Campus, Suva, Fiji"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4770-389X","authenticated-orcid":false,"given":"Robert","family":"Frouin","sequence":"additional","affiliation":[{"name":"Scripps Institution of Oceanography, University of California San Diego, 8810 Shellback Way, La Jolla, CA 92093, USA"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,31]]},"reference":[{"key":"ref_1","first-page":"s43","article-title":"Copernicus Marine Service Ocean State Report, Issue 3","volume":"12","author":"Holland","year":"2019","journal-title":"J. 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