Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 64662 10.2205/2023ES000863 GEYPMH ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Spreading of the Amazon River Plume Spreading of the Amazon River Plume https://orcid.org/0000-0002-0251-3454 Морозов Евгений Георгиевич Morozov Eugene Georgievich egmorozov@mail.ru Завьялов П О Zavialov P O Замшин В В Zamshin V V https://orcid.org/0000-0002-7207-1022 Моллер О О Moller O O https://orcid.org/0000-0001-8141-9513 Фрей Д И Frey D I https://orcid.org/0000-0001-6856-4783 Зуев Олег А Zuev Oleg A https://orcid.org/0009-0006-1489-8933 Селиверстова Анна М Seliverstova Anna M Буланов Алексей В Bulanov Alexey V Липинская Надежда А Lipinskaya Nadezhda A Салюк Павел А Salyuk Pavel A Чверткова Ольга И Chvertkova Olga I Немировская Инна А Nemirovskaya Inna A https://orcid.org/0000-0001-6440-060X Кречик Виктор А. Krechik Viktor A Чульцова Анна Л Chultsova Anna L Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Научно-исследовательский институт аэрокосмического мониторинга "АЭРОКОСМОС" Россия AEROCOSMOS Research Institute for Aerospace Monitoring Russian Federation Федеральный университет штата Рио-Гранде Россия Federal University of the State of Rio Grande Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Тихоокеанский океанологический институт им. В.И. Ильичева Дальневосточного отделения Российской академии наук Россия V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch Russian Federation Тихоокеанский океанологический институт им. В.И. Ильичева Дальневосточного отделения Российской академии наук Россия V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch Russian Federation Тихоокеанский океанологический институт им. В.И. Ильичева Дальневосточного отделения Российской академии наук Россия V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch Russian Federation АЭРОКОСМОС Россия AEROCOSMOS Research Institute for Aerospace Monitoring Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation 10 12 2023 10 12 2023 23 4 1 18 24 05 2023 17 07 2023 https://rjes.ru/en/nauka/article/64662/view

Results of a joint Russian-Brazilian expedition to study the dynamics of continental river runoff in the ocean associated with the Amazon plume are presented. The stations of the study region covered the seaward part of the Amazon plume. The work was carried out in the dry season (November). The data of in situ measurements and satellite data show that the most desalinated and rich in suspended particulate matter and chlorophyll-a waters were localized on the shallow inner shelf. The horizontal and vertical structure of the thermohaline fields indicates the presence of a well-pronounced river plume about 15 m thick. The decrease in salinity in the plume relative to the background values exceeded 6 PSU even at 300–400 km from the river mouth. The plume waters were characterized by increased concentrations of suspended matter. The best approximation to the in situ measurements is provided by the SMOS satellite salinity data and reanalysis GLORYS12. Chemical determinations in the surface layer in the area of the plume reveal elevated concentrations of silicates, phosphates, and nitrites compared to the seaward part.

Results of a joint Russian-Brazilian expedition to study the dynamics of continental river runoff in the ocean associated with the Amazon plume are presented. The stations of the study region covered the seaward part of the Amazon plume. The work was carried out in the dry season (November). The data of in situ measurements and satellite data show that the most desalinated and rich in suspended particulate matter and chlorophyll-a waters were localized on the shallow inner shelf. The horizontal and vertical structure of the thermohaline fields indicates the presence of a well-pronounced river plume about 15 m thick. The decrease in salinity in the plume relative to the background values exceeded 6 PSU even at 300–400 km from the river mouth. The plume waters were characterized by increased concentrations of suspended matter. The best approximation to the in situ measurements is provided by the SMOS satellite salinity data and reanalysis GLORYS12. Chemical determinations in the surface layer in the area of the plume reveal elevated concentrations of silicates, phosphates, and nitrites compared to the seaward part.

 Amazon plume satellite images CTD casts chlorophyll-a frontal zone suspended particular matter Amazon plume satellite images CTD casts chlorophyll-a frontal zone suspended particular matter The study was carried out within the framework of State Assignments FMWE-2021-0002 (ship measurements), 0211-2021-0007 (bio-optical investigations) and supported by the Russian Science Foundation grant 21-77-20004 (field data analysis and interpretation). The data of measurements can be sent on request.

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