Spreading of the Amazon River Plume-Reference-Cited by-同舟云学术

Spreading of the Amazon River Plume

Published:2023-09-27 Issue: Volume: Page:1-18
ISSN:1681-1208
Container-title:Russian Journal of Earth Sciences
language:en
Short-container-title:

Author:

Morozov Eugene¹^ORCID,Zavialov P¹,Zamshin V²,Moller O³^ORCID,Frey D¹^ORCID,Zuev Oleg¹^ORCID,Seliverstova Anna¹^ORCID,Bulanov Alexey⁴,Lipinskaya Nadezhda⁴,Salyuk Pavel⁴,Chvertkova Olga²,Nemirovskaya Inna¹,Krechik Viktor¹^ORCID,Chultsova Anna¹

Affiliation:

1. Shirshov Institute of Oceanology RAS

2. AEROCOSMOS Research Institute for Aerospace Monitoring

3. Federal University of the State of Rio Grande

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

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.

Publisher

Geophysical Center of the Russian Academy of Sciences

Subject

General Earth and Planetary Sciences

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