scholarly journals Seasonal and interannual variability of sea-air CO2fluxes in the tropical Atlantic affected by the Amazon River plume

2015 ◽  
Vol 29 (10) ◽  
pp. 1640-1655 ◽  
Author(s):  
J. Severino P. Ibánhez ◽  
Denis Diverrès ◽  
Moacyr Araujo ◽  
Nathalie Lefèvre
Keyword(s):  
Interannual Variability ◽  
River Plume ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Seasonal And Interannual Variability ◽  
Amazon River Plume

scholarly journals Amazon River plume influence on Western Tropical Atlantic dynamic variability

2019 ◽  
Vol 85 ◽  
pp. 1-15 ◽  
Author(s):  
H.L. Varona ◽  
D. Veleda ◽  
M. Silva ◽  
M. Cintra ◽  
M. Araujo
Keyword(s):  
River Plume ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Amazon River Plume

scholarly journals Contribution of the Amazon River Discharge to Regional Sea Level in the Tropical Atlantic Ocean

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2348 ◽  
Author(s):  
Pierrick Giffard ◽  
William Llovel ◽  
Julien Jouanno ◽  
Guillaume Morvan ◽  
Bertrand Decharme
Keyword(s):  
Atlantic Ocean ◽  
Interannual Variability ◽  
Sea Level ◽  
River Discharge ◽  
River Mouth ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Tropical Atlantic Ocean ◽  
Seasonal And Interannual Variability ◽  
Mean State

The Amazon River is by far the largest river by volume of water in the world, representing around 17% of the global riverine discharge to the oceans. Recent studies suggested that its impact on sea level is potentially important at global and regional scales. This study uses a set of regional simulations based on the ocean model NEMO to quantify the influence of the Amazon runoff on sea level in the Tropical Atlantic Ocean. The model is forced at its boundaries with daily fields from the ocean reanalysis GLORYS2V4. Air-sea fluxes are computed using atmospheric variables from DFS5.2, which is a bias-corrected version of ERAinterim reanalysis. The particularity of this study is that interannual daily runoffs from the up-to-date ISBA-CTRIP land surface model are used. Firstly, mean state of sea level is investigated through a comparison between a simulation with an interannual river discharge and a simulation without any Amazon runoff. Then, the impact of the Amazon River on seasonal and interannual variability of sea level is examined. It was shown that the Amazon River has a local contribution to the mean state sea level at the river mouth but also a remote contribution of 3.3 cm around the whole Caribbean Archipelago, a region threatened by the actual sea level rise. This effect is mostly due to a halosteric sea level contribution for the upper 250 m of the ocean. This occurs in response to the large scale advection of the plume and the downward mixing of subsurface waters at winter time. The Amazon discharge also induces an indirect thermosteric sea level contribution. However, this contribution is of second order and tends to counterbalance the halosteric sea level contribution. Regional mass redistributions are also observed and consist in a 8 cm decrease of the sea level at the river mouth and a 4.5 increases on continental shelves of the Gulf of Mexico and Caribbean Sea. In terms of variability, simulations indicate that the Amazon discharge may contributes to 23% and 12% of the seasonal and interannual sea level variances in the Caribbean Archipelago area. These variances are first explained by the Amazon time mean discharge and show very weak sensitivity to the seasonal and interannual variability of the Amazon runoff.

Amazon river plume influence on planktonic decapods in the tropical Atlantic

2020 ◽  
Vol 212 ◽  
pp. 103428
Author(s):  
Claudeilton Severino de Santana ◽  
Simone Maria de Albuquerque Lira ◽  
Humberto L. Varona ◽  
Sigrid Neumann-Leitão ◽  
Moacyr Araujo ◽  
...  
Keyword(s):  
River Plume ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Amazon River Plume

scholarly journals The Amazon River plume, a barrier to animal dispersal in the Western Tropical Atlantic

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Everton Giachini Tosetto ◽  
Arnaud Bertrand ◽  
Sigrid Neumann-Leitão ◽  
Miodeli Nogueira Júnior
Keyword(s):  
Caribbean Sea ◽  
River Plume ◽  
Amazon River ◽  
Tropical Atlantic ◽  
Animal Kingdom ◽  
Dispersal Capacity ◽  
Western Atlantic ◽  
The Caribbean ◽  
Amazon River Plume ◽  
Reduced Mobility

AbstractThe dispersal of marine organisms can be restricted by a set of isolation mechanisms including hard barriers or hydrological features. In the Western Atlantic Ocean, the Amazon River discharge has been shown to act as a biogeographical barrier responsible for the differences in reef fish communities between Caribbean Sea and Northeast Brazil continental shelves. Here, we compare the diversity of all Animalia phyla from biogeographic ecoregions along the Tropical Western Atlantic continental shelf to test the hypothesis that the Amazon River plume spatially structures species diversity. For that, we used beta diversity estimators and multivariate ecological analysis on a database of species occurrence of the whole animal kingdom including 175,477 occurrences of 8,375 species from six ecoregions along the Western Tropical Atlantic. Results of the whole animal kingdom and the richest phyla showed that the Caribbean Sea and Tropical Brazil ecoregions are isolated by the Amazon River Plume, broadening and confirming the hypothesis that it acts as a soft barrier to animal dispersal in the Western Tropical Atlantic. Species sharing is larger northwestwards, in direction of the Caribbean than the opposite direction. Beyond species isolation due to local characteristics such as low salinity and high turbidity, our results suggest the dominant northwestward currents probably play a major role in animal dispersion: it enhances the flux of larvae and other planktonic organisms with reduced mobility from Brazil to Caribbean and hinders their contrary movement. Thus, the Amazon area is a strong barrier for taxa with reduced dispersal capacity, while species of pelagic taxa with active swimming may transpose it more easily.

scholarly journals Manatee genomics supports a special conservation area along the Guianas coastline under the influence of the Amazon River plume

2019 ◽  
Vol 231 ◽  
pp. 106436
Author(s):  
Sibelle T. Vilaça ◽  
Camilla S. Lima ◽  
Camila J. Mazzoni ◽  
Fabricio R. Santos ◽  
Benoit de Thoisy
Keyword(s):  
River Plume ◽  
Amazon River ◽  
Conservation Area ◽  
Amazon River Plume ◽  
The Guianas

scholarly journals Manatee genomics supports a special conservation area along the Guianas coastline under the influence of the Amazon River plume

2019 ◽  
Vol 226 ◽  
pp. 106286 ◽  
Author(s):  
Sibelle T. Vilaça ◽  
Camilla S. Lima ◽  
Camila J. Mazzoni ◽  
Fabricio R. Santos ◽  
Benoit de Thoisy
Keyword(s):  
River Plume ◽  
Amazon River ◽  
Conservation Area ◽  
Amazon River Plume ◽  
The Guianas
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