Jet Streams of the Tropical Atlantic: Observing and Forecasting the North Brazil Current Retroflection

2013 ◽  
Author(s):  
Michael Christensen ◽  
Ashwanth Srinivasan ◽  
Jill Nelson ◽  
Neha Sharma ◽  
Peter Brickley
Keyword(s):  
Tropical Atlantic ◽  
Jet Streams ◽  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current

scholarly journals Investigation of the Intra-Annual Variability of the North Equatorial Countercurrent/North Brazil Current Eddies and of the Instability Waves of the North Tropical Atlantic Ocean Using Satellite Altimetry and Empirical Mode Decomposition

2017 ◽  
Vol 34 (10) ◽  
pp. 2295-2310 ◽  
Author(s):  
Jean-Luc Mélice ◽  
Sabine Arnault
Keyword(s):  
Atlantic Ocean ◽  
Empirical Mode Decomposition ◽  
Satellite Altimetry ◽  
Tropical Atlantic ◽  
Instability Waves ◽  
The North ◽  
Brazil Current ◽  
Mode Decomposition ◽  
North Brazil ◽  
North Brazil Current

AbstractThe intra-annual variability of the tropical Atlantic Ocean north of the equator is investigated with satellite altimetry mean sea level anomaly data and with an algorithm based on empirical mode decomposition (EMD) methods. Two regions of high variability are identified. The first region, between 3° and 12°N, is characterized by the presence of westward-propagating eddies linked to the North Brazil Current (NBC) retroflection in the vicinity of the Brazilian coast. They show a strong annual cycle. In this paper the EMD algorithm points out that this signal is frequency modulated shifting from large length-scale structures in October to smaller ones in March. Consequently, the number of “eddies” per year can be aliased, according to the time and location of sampling, and can impact the percentage they explain of the interhemispheric exchange of mass and heat associated with the meridional overturning circulation’s upper limb. A scenario concerning this dynamics is proposed. The second region reveals the presence of westward-propagating instability waves centered north of the equator (3°–7°N) between 50° and 10°W. These instability waves are also frequency modulated and show a strong seasonal cycle with maximum amplitude around August.

Impact of mesoscale eddies on salinity and CO2 ocean parameters in the western tropical Atlantic in February 2020

2021 ◽  
Author(s):  
Léa Olivier ◽  
Jacqueline Boutin ◽  
Nathalie Lefèvre ◽  
Gilles Reverdin ◽  
Peter Landschützer ◽  
...  
Keyword(s):  
Dissolved Inorganic Carbon ◽  
Salinity Gradient ◽  
Sea Surface Salinity ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Surface Salinity ◽  
The North ◽  
Brazil Current ◽  
North Brazil

<p>Large oceanic eddies are formed by the retroflection of the North Brazil Current (NBC) near 8°N in the western tropical Atlantic. The EUREC<sup>4</sup>A-OA/Atomic cruise took place in January - February 2020, and extensively documented two NBC rings. The NBC flows northward across the Equator and pass the mouth of the Amazon River, entraining fresh and nutrient-rich water along its nearshore edge. From December to March, the Amazon river discharge is low but a freshwater filament stirred by a NBC ring was nevertheless observed. The strong salinity gradient can be used to delineate the NBC ring during its initial phase and its westward propagation. Using satellite sea surface salinity and ocean color associated to in-situ measurements of salinity, temperature, dissolved inorganic carbon, alkalinity and fugacity of CO<sub>2</sub> we characterize the salinity and biogeochemical signature of NBC rings.</p>

Retroflections of the North Brazil Current during February 2002

2005 ◽  
Vol 52 (4) ◽  
pp. 647-667 ◽  
Author(s):  
Marlos Goes ◽  
Robert Molinari ◽  
Ilson da Silveira ◽  
Ilana Wainer
Keyword(s):  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current

The North Brazil Current retroflection: Seasonal structure and eddy variability

1990 ◽  
Vol 95 (C12) ◽  
pp. 22103 ◽  
Author(s):  
William E. Johns ◽  
Thomas N. Lee ◽  
Friedrich A. Schott ◽  
Rainer J. Zantopp ◽  
Robert H. Evans
Keyword(s):  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current
Sign in / Sign up

Export Citation Format

Share Document