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As a result, several regional Chl-a algorithms have been proposed. The present work aims at assessing the performance of both global and regional satellite algorithms that are currently available for the Western Antarctic Peninsula (WAP) and investigate which factors are contributing to the underestimation of Chl-a. Our study indicates that a global algorithm, on average, underestimates in-situ Chl-a by ~59%, although underestimation was only observed for waters with Chl-a &gt; 0.5 mg m\u22123. In high Chl-a waters (&gt;1 mg m\u22123), Chl-a underestimation rose to nearly 80%. Contrary to previous studies, no clear link was found between Chl-a underestimation and the pigment packaging effect, nor with the phytoplankton community composition and sea ice contamination. Based on multi-sensor satellite data and the most comprehensive in-situ dataset ever collected from the WAP, a new, more accurate satellite Chl-a algorithm is proposed: the OC4-SO. The OC4-SO has great potential to become an important tool not only for the ocean colour community, but also for an effective monitoring of the phytoplankton communities in a climatically sensitive region where in-situ data are scarce.<\/jats:p>","DOI":"10.3390\/rs14051052","type":"journal-article","created":{"date-parts":[[2022,2,22]],"date-time":"2022-02-22T22:35:00Z","timestamp":1645569300000},"page":"1052","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["OC4-SO: A New Chlorophyll-a Algorithm for the Western Antarctic Peninsula Using Multi-Sensor Satellite Data"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2670-8125","authenticated-orcid":false,"given":"Afonso","family":"Ferreira","sequence":"first","affiliation":[{"name":"MARE\u2014Marine and Environmental Sciences Centre, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal"},{"name":"Laborat\u00f3rio de Fitopl\u00e2ncton e Microorganismos Marinhos, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande 96203-900, RS, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6539-5830","authenticated-orcid":false,"given":"Ana C.","family":"Brito","sequence":"additional","affiliation":[{"name":"MARE\u2014Marine and Environmental Sciences Centre, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6875-8860","authenticated-orcid":false,"given":"Carlos R. B.","family":"Mendes","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Fitopl\u00e2ncton e Microorganismos Marinhos, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande 96203-900, RS, Brazil"},{"name":"Laborat\u00f3rio de Estudos do Oceano e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande 96203-900, RS, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8612-4167","authenticated-orcid":false,"given":"Vanda","family":"Brotas","sequence":"additional","affiliation":[{"name":"MARE\u2014Marine and Environmental Sciences Centre, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal"}]},{"given":"Raul R.","family":"Costa","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Fitopl\u00e2ncton e Microorganismos Marinhos, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande 96203-900, RS, Brazil"},{"name":"Laborat\u00f3rio de Estudos do Oceano e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande 96203-900, RS, Brazil"}]},{"given":"Catarina V.","family":"Guerreiro","sequence":"additional","affiliation":[{"name":"MARE\u2014Marine and Environmental Sciences Centre, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal"},{"name":"IDL\u2014Instituto Dom Luiz, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal"}]},{"given":"Carolina","family":"S\u00e1","sequence":"additional","affiliation":[{"name":"Portugal Space, Pal\u00e1cio das Laranjeiras, Estrada das Laranjeiras, 205\u2014r\/c, 1649-018 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4336-1597","authenticated-orcid":false,"given":"Thomas","family":"Jackson","sequence":"additional","affiliation":[{"name":"Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK"}]}],"member":"1968","published-online":{"date-parts":[[2022,2,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"GB1005","DOI":"10.1029\/2008GB003349","article-title":"Oceanic sources, sinks, and transport of atmospheric CO2","volume":"23","author":"Gruber","year":"2009","journal-title":"Glob. 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