CHAMP satellite and terrestrial magnetic data help define the tectonic model for South America and resolve the lingering problem of the pre-break-up fit of the South Atlantic Ocean

2003 ◽  
Vol 22 (8) ◽  
pp. 779-783 ◽  
Author(s):  
J. Derek Fairhead ◽  
Stefan Maus
Keyword(s):  
South America ◽  
Atlantic Ocean ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Magnetic Data ◽  
The South ◽  
Champ Satellite ◽  
Tectonic Model ◽  
Break Up

Assessing levels of POPs in air over the South Atlantic Ocean off the coast of South America

2016 ◽  
Vol 571 ◽  
pp. 172-177 ◽  
Author(s):  
César N. Pegoraro ◽  
Tom Harner ◽  
Ky Su ◽  
Malisa S. Chiappero
Keyword(s):  
South America ◽  
Atlantic Ocean ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
The South

scholarly journals Ages of the Magmatism and the Opening of the South Atlantic Ocean

1998 ◽  
Vol 25 (2) ◽  
pp. 47 ◽  
Author(s):  
ANA MARIA PIMENTEL MIZUSAKI ◽  
ANTONIO THOMAZ FILHO ◽  
PEDRO DE CESERO
Keyword(s):  
Atlantic Ocean ◽  
Process Development ◽  
Volcanic Rocks ◽  
River Mouth ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Geochemical Data ◽  
Brazilian Coast ◽  
The South ◽  
Break Up

The analysis of published and unpublished 368 K/Ar radiometric ages of basic, intermediate and alkaline volcanic rocks, related to the post-Paleozoic magmatism linked to the opening of the South Atlantic Ocean, yields some important evidence concerning the break up of the Gondwana supercontinent. At the Brazilian Equatorial margin, the Gondwana break up started in the Permo-Triassic, when the opening of the Equatorial South Atlantic Ocean began and spread out south-eastward up to the present day Amazon River mouth. During the middle Jurassic/lower Cretaceous (pre-Aptian), the continuity of this separation, towards the Potiguar Basin, was coeval with the northward opening of the south-east Brazilian margin, up to the Espírito Santo State latitude. The relationship between large volcanic events in the basins and the resistance to the rifting process development offered by the cratonic area was shown by the trend of the magmatic age. Along the equatorial margin, the fragmentation resistance caused by the São Luis / West African craton is manifested by a large basic magmatism described in the Tacutu, Acre, Solimões, Amazonas and Parnaíba basins. A similar mechanism along the south-east margin, is proposed for the magmatism described in the Paraná Basin which is associated with the fracturing resistance offered by the São Francisco/Congo cratonic area. The integration of geochronological, micropalentological, sedimentological and geochemical data from the basins of the east Brazilian continental margin supports a model to explain the final disruption between South America and Africa during Cenonian/Turonian time. This model implies that 90 Ma basic magmatic rocks, related to the oceanic crust formation, probably occur offshore from the present-day eastern Brazilian coast line.

scholarly journals Modulation of Midtropospheric CO2 by the South Atlantic Walker Circulation*

2015 ◽  
Vol 72 (6) ◽  
pp. 2241-2247 ◽  
Author(s):  
Xun Jiang ◽  
Edward T. Olsen ◽  
Thomas S. Pagano ◽  
Hui Su ◽  
Yuk L. Yung
Keyword(s):  
South America ◽  
Atlantic Ocean ◽  
Large Scale ◽  
Climate Models ◽  
Walker Circulation ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Strong Impact ◽  
The South ◽  
Near Surface

Abstract Midtropospheric CO2 data from the Atmospheric Infrared Sounder (AIRS) are used in this study to explore the variability of CO2 over the South Atlantic Ocean. It was found that the area-averaged CO2 over the South Atlantic Ocean is less than that over South America by about 1 ppm during December–March. This CO2 contrast is due to the large-scale vertical circulation over this region. During December–March, there is sinking motion over the South Atlantic Ocean. The sinking motion brings high-altitude air with a slightly lower concentration of CO2 to the midtroposphere. Meanwhile, air rising over South America brings near-surface air with a higher concentration of CO2 to the midtroposphere. As a result, the AIRS midtropospheric CO2 concentration is lower over the South Atlantic Ocean than over South America during December–March. The detrended AIRS midtropospheric CO2 difference correlates well with the inverted and detrended 400-hPa vertical pressure velocity difference between the South Atlantic and South America. Results obtained from this study demonstrate the strong impact of large-scale circulation on the vertical distribution of CO2 in the free troposphere and suggest that midtropospheric CO2 measurements can be used as an innovative observational constraint on the simulation of large-scale circulations in climate models.

scholarly journals Migration and summer destinations of humpback whales (Megaptera novaeangliae) in the western South Atlantic Ocean

2020 ◽  
pp. 113-118
Author(s):  
Alexandre N. Zerbini ◽  
Artur Andriolo ◽  
Mads Peter Heide-Jorgensen ◽  
Sergio C. Moreira ◽  
Jose Luis Pizzorno ◽  
...  
Keyword(s):  
South America ◽  
Atlantic Ocean ◽  
Satellite Telemetry ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Humpback Whales ◽  
Telemetry Data ◽  
The South ◽  
The Antarctic ◽  
Feeding Grounds

Southern Hemisphere humpback whales (Megaptera novaeangliae) migrate from wintering grounds in tropical latitudes to feeding areas in the Antarctic Ocean. In 2003 and 2005, satellite transmitters were deployed on humpback whales on their wintering grounds off the eastern coast of South America (Breeding Stock A). Seven whales were tracked for a period of 16 to 205 days travelling between 902 and 7,258km. The tracks of these whales provided partial or full information on the migratory schedule, migration routes and location of the feeding ground in the Southern Oceans. Whales departed from the coast of Brazil from late October to late December between 20˚ and 25˚S and gradually moved away from the South American coast as they moved towards high latitudes. They followed a somewhat direct, linear path, with an approximate geographic heading of 170˚. Satellite telemetry data indicated that the migratory corridors are restricted to a relatively narrow (~500–800km) strip in the South Atlantic Ocean. Migration speed to the feeding grounds averaged 80.2km/day and lasted from 40–58 days. Four individuals arrived at the feeding ground located to the north of the South Sandwich Islands, where they were tracked up to 102 days. Movements in this area were erratic at a mean travelling speed of 22.3km/day. Satellite telemetry data indicate that the main feeding grounds for the population wintering off eastern South America lie between 22˚W and 33˚W and in the southern South Atlantic Ocean south of the Antarctic Convergence but north of 60˚S. This is only partially consistent with the currently proposed stock boundaries for this population on the feeding grounds.

scholarly journals Wind speed and mesoscale features drive net autotrophy in the South Atlantic Ocean

2021 ◽  
Vol 260 ◽  
pp. 112435
Author(s):  
Daniel Ford ◽  
Gavin H. Tilstone ◽  
Jamie D. Shutler ◽  
Vassilis Kitidis ◽  
Polina Lobanova ◽  
...  
Keyword(s):  
Wind Speed ◽  
Atlantic Ocean ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
The South
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