scholarly journals Southern Ocean Origin of Multidecadal Variability in the North Brazil Current

2018 ◽  
Author(s):  
René van Westen ◽  
Henk Dijkstra
Keyword(s):  
Southern Ocean ◽  
Multidecadal Variability ◽  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current

scholarly journals Southern Ocean Origin of Multidecadal Variability in the North Brazil Current

2017 ◽  
Vol 44 (20) ◽  
pp. 10,540-10,548 ◽  
Author(s):  
René M. van Westen ◽  
Henk A. Dijkstra
Keyword(s):  
Southern Ocean ◽  
Multidecadal Variability ◽  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current

scholarly journals Multidecadal variability of the North Brazil Current

Eos ◽  
2011 ◽  
Vol 92 (23) ◽  
pp. 200-200
Author(s):  
Ernie Tretkoff
Keyword(s):  
Multidecadal Variability ◽  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current

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

scholarly journals Research Spotlight: The traveling rings of the North Brazil Current

Eos ◽  
2011 ◽  
Vol 92 (17) ◽  
pp. 148-148
Author(s):  
Colin Schultz
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

scholarly journals Terrigenous input off northern South America driven by changes in Amazonian climate and the North Brazil Current retroflection during the last 250 ka

2013 ◽  
Vol 9 (5) ◽  
pp. 5855-5898 ◽  
Author(s):  
A. Govin ◽  
C. M. Chiessi ◽  
M. Zabel ◽  
A. O. Sawakuchi ◽  
D. Heslop ◽  
...  
Keyword(s):  
Sediment Cores ◽  
Austral Summer ◽  
Suspended Sediments ◽  
Sole Source ◽  
The North ◽  
Brazil Current ◽  
North Brazil ◽  
North Brazil Current ◽  
Freshwater Plume ◽  
Detrital Particles

Abstract. We investigate changes in the delivery and oceanic transport of Amazon sediments related to terrestrial climate variations over the last 250 ka. We present high-resolution geochemical records from four marine sediment cores located between 5 and 12° N along the northern South American margin. The Amazon River is the sole source of terrigenous material for sites at 5 and 9° N, while the core at 12° N receives a mixture of Amazon and Orinoco detrital particles. Using an endmember unmixing model, we estimated the relative proportions of Amazon Andean material ("%-Andes", at 5 and 9° N) and of Amazon material ("%-Amazon", at 12° N) within the terrigenous fraction. The %-Andes and %-Amazon records exhibit significant precessional variations over the last 250 ka that are more pronounced during interglacials in comparison to glacial times. High %-Andes values observed during periods of high austral summer insolation reflect the increased delivery of suspended sediments by Andean tributaries and enhanced Amazonian precipitation, in agreement with western Amazonian speleothem records. However, low %-Amazon values obtained at 12° N during the same periods seem to contradict the increased delivery of Amazon sediments. We propose that reorganisations in surface ocean currents modulate the northwestward transport of Amazon material. In agreement with published records, the seasonal North Brazil Current retroflection is intensified (or prolonged in duration) during cold substages of the last 250 ka (which correspond to intervals of high DJF or low JJA insolation) and deflects eastward the Amazon sediment and freshwater plume.

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