scholarly journals Atmospheric boundary layer adjustment to the synoptic cycle at the Brazil-Malvinas Confluence, South Atlantic Ocean

2010 ◽  
Vol 115 (D22) ◽  
Author(s):  
Otávio C. Acevedo ◽  
Luciano P. Pezzi ◽  
Ronald B. Souza ◽  
Vagner Anabor ◽  
Gervásio A. Degrazia
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
Atmospheric Boundary Layer ◽  
South Atlantic ◽  
South Atlantic Ocean

scholarly journals The surface thermal signature and air–sea coupling over the Agulhas rings propagating in the South Atlantic Ocean interior

2013 ◽  
Vol 10 (6) ◽  
pp. 2327-2361
Author(s):  
J. M. A. C. Souza ◽  
B. Chapron ◽  
E. Autret
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
Atmospheric Boundary Layer ◽  
Surface Wind ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Ekman Pumping ◽  
Marine Atmospheric Boundary Layer ◽  
The South ◽  
Sst Anomalies

Abstract. The surface signature of the Agulhas rings propagating across the South Atlantic Ocean is observed based on 3 independent datasets: TMI/AMSR-E satellite sea surface temperature, Argo profiling floats and a merged winds product derived from scatterometer observations and reanalysis results. A persistent pattern of cold (negative) SST anomalies in the eddy core, with warm (positive) anomalies at the boundary is revealed. This pattern contrasts with the classical idea of a warm core anti-cyclone. Taking advantage of a moving reference frame corresponding to the altimetry-detected Agulhas rings, modifications of the surface winds by the ocean induced currents and SST gradients are evaluated using satellite SST and wind observations. As obtained, the averaged stationary thermal expression and mean eddy-induced circulation are coupled to the marine atmospheric boundary layer, leading to surface wind anomalies. Consequently, an average Ekman pumping associated with these mean surface wind variations is consistently emerging. This average Ekman pumping is found to very well explain the SST anomaly signatures of the detected Agulhas rings. Particularly, this mechanism seems to be the key factor determining that these anti-cyclonic eddies exhibit stationary imprints of cold SST anomalies near their core centers. A residual phase with the maximum SSH anomaly and wind speed anomaly is found to the right of the mean wind direction, apparently maintaining a coherent stationary thermal expression coupled to the marine atmospheric boundary layer.

scholarly journals A juvenile Tristan albatross (Diomedea dabbenena) on land at the Crozet Islands

Polar Biology ◽  
2020 ◽  
Author(s):  
Alexander L. Bond ◽  
Christopher Taylor ◽  
David Kinchin-Smith ◽  
Derren Fox ◽  
Emma Witcutt ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Cytochrome B ◽  
Adult Male ◽  
Mitochondrial Gene ◽  
Small Population ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Tristan Da Cunha ◽  
Gough Island ◽  
Dispersal Events

AbstractAlbatrosses and other seabirds are generally highly philopatric, returning to natal colonies when they achieve breeding age. This is not universal, however, and cases of extraordinary vagrancy are rare. The Tristan Albatross (Diomedea dabbenena) breeds on Gough Island in the South Atlantic Ocean, with a small population on Inaccessible Island, Tristan da Cunha, ca 380 km away. In 2015, we observed an adult male albatross in Gonydale, Gough Island, which had been ringed on Ile de la Possession, Crozet Islands in 2009 when it was assumed to be an immature Wandering Albatross (D. exulans). We sequenced 1109 bp of the cytochrome b mitochondrial gene from this bird, and confirmed it to be a Tristan Albatross, meaning its presence on Crozet 6 years previous, and nearly 5000 km away, was a case of prospecting behaviour in a heterospecific colony. Given the challenges in identifying immature Diomedea albatrosses, such dispersal events may be more common than thought previously.

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

scholarly journals The source of Benguela Niños in the South Atlantic Ocean

2003 ◽  
Vol 30 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Pierre Florenchie ◽  
Johann R. E. Lutjeharms ◽  
C. J. C. Reason ◽  
S. Masson ◽  
M. Rouault
Keyword(s):  
Atlantic Ocean ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
The South
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