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To modify the algorithm, the data of in situ measurements of coccolithophore Emiliania huxleyi abundance performed in June 2017 and 2022 (when the maximum values were 9 \u00d7 106 and 13 \u00d7 106 Cells L\u22121, respectively), as well as the data from hydro-optical and satellite measurements, were used. In addition, the ratio between the number of detached coccoliths and coccolithophore cells was taken into account. Based on the expanded array of in situ data, the optimal values of the regional algorithm parameters were obtained. The modified algorithm makes it possible to obtain more accurate results in areas of high coccolithophore concentrations and takes into account the contribution of coccoliths. To test the sensitivity of the algorithm to variations in bio-optical characteristics, model calculations were performed using Hydrolight software. The updated algorithm is significantly less sensitive to variations in chlorophyll concentration and CDOM absorption coefficient than its previous version.<\/jats:p>","DOI":"10.3390\/rs15092219","type":"journal-article","created":{"date-parts":[[2023,4,24]],"date-time":"2023-04-24T02:06:11Z","timestamp":1682301971000},"page":"2219","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Regional Algorithm for Estimating High Coccolithophore Concentration in the Northeastern Part of the Black Sea"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7792-8489","authenticated-orcid":false,"given":"Svetlana","family":"Vazyulya","sequence":"first","affiliation":[{"name":"Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Dmitriy","family":"Deryagin","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117997 Moscow, Russia"},{"name":"Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5641-4227","authenticated-orcid":false,"given":"Dmitry","family":"Glukhovets","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117997 Moscow, Russia"},{"name":"Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia"}]},{"given":"Vladimir","family":"Silkin","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117997 Moscow, Russia"}]},{"given":"Larisa","family":"Pautova","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117997 Moscow, Russia"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"237","DOI":"10.1126\/science.281.5374.237","article-title":"Primary Production of the Biosphere: Integrating Terrestrial and Oceanic Components","volume":"281","author":"Field","year":"1998","journal-title":"Science"},{"key":"ref_2","unstructured":"Falkowski, P.G., and Raven, J.A. 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