SPREADING OF THE AMAZON RIVER PLUME

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Abstract

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.

About the authors

E. G. Morozov

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru
ORCID iD: 0000-0002-0251-3454

P. O. Zavialov

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru

V. V. Zamshin

AEROCOSMOS Research Institute for Aerospace Monitoring

Email: egmorozov@mail.ru

O. O. Moller

Federal University of the State of Rio Grande

Email: egmorozov@mail.ru
ORCID iD: 0000-0002-7207-1022

D. I. Frey

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru
ORCID iD: 0000-0001-8141-9513

O. A. Zuev

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru
ORCID iD: 0000-0001-6856-4783

A. M. Seliverstova

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru
ORCID iD: 0009-0006-1489-8933

A. V. Bulanov

V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch

Email: egmorozov@mail.ru

N. A. Lipinskaya

V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch

Email: egmorozov@mail.ru

P. A. Salyuk

V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch

Email: egmorozov@mail.ru

Olga I. Chvertkova

AEROCOSMOS Research Institute for Aerospace Monitoring

Email: egmorozov@mail.ru

I. A. Nemirovskaya

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru

V. A. Krechik

Shirshov Institute of Oceanology RAS

Email: egmorozov@mail.ru
ORCID iD: 0000-0001-6440-060X

A. L. Chultsova

Shirshov Institute of Oceanology RAS

Author for correspondence.
Email: egmorozov@mail.ru

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Copyright (c) 2023 Морозов Е.G., Завьялов П.O., Замшин В.V., Моллер О.O., Фрей Д.I., Зуев О.A., Селиверстова А.M., Буланов А.V., Липинская Н.A., Салюк П.A., Чверткова О.I., Немировская И.A., Кречик В.A., Чульцова А.L.

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