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The Barreirinhas Eddies: Stable Energetic Anticyclones in the Near-Equatorial South Atlantic
Name
fmars-08-617011.pdf
Description
Published version
Size
3.72 MB
Format
Adobe PDF
Checksum (MD5)
dc8274d12f03332f9dda586d78b7f05a
Author(s)
Simoes-Sousa, Iury T
Silveira, Ilson Carlos A
Tandon, Amit
Flierl, Glenn R
Ribeiro, Cesar HA
Martins, Renato P
Date Issued
2021
Journal
Frontiers in Marine Science
Publisher
Frontiers Media SA
Version
Final published version
Abstract
© Copyright © 2021 Simoes-Sousa, Silveira, Tandon, Flierl, Ribeiro and Martins. We explore the Barreirinhas Eddies, submesoscale vortices generated by the North Brazil Current (NBC) off the Barreirinhas Bight (Brazil, centered at 1.75°S), using vessel-mounted and moored ADCP data, and a Global HYCOM reanalysis. These double-stacked anticyclones with incredibly high Rossby Number [(Formula presented.) (10)] occur independently at different depths (high Burger number). Anticyclones with Rossby number greater than unity are unstable according to inviscid linear theory, and hence these submesoscale features are not easily observable at mid latitudes. At these low latitudes, they last about a week, allowing characterization by oceanographic surveys. Our analyses suggest this increased stability is due to the joint effect of strong winds, stratification, proximity to the equator, and topography. Heretofore hypothesized via analytical studies and seen in numerical models, our study confirms this stabilization process in observations, and is also a starting point for the description of the submesoscale dynamics in the NBC domain.
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
10.3389/FMARS.2021.617011
