Influence of the
Physics and Chemistry of the Earth, Part
B: Hydrology, Oceans and Atmosphere, Volume 26, Issue 2,
S. Masson and P Delecluse
Summary of Points:
· Comparison of simulations with constant or monthly runoffs shows that the spread of the Amazon fresh waters offshore of the north Brazilian coast is controlled by the ocean circulation and not by the Amazon flow.
· In the model like on the observations, SSS minimum is observed in summer three months after the Amazon flood.
· A thick (more than 40 m) Barrier Layer (BL) is present every summer north of the Amazon mouth.
· Because of the strong and shallow salinity gradient associated with the Amazon freshwater, an important part of the solar radiation is trapped in the BL and creates an inversion of the vertical gradient of temperature. Freshwater flux is also able to bend the sea surface. The geostrophic part of the North Brazilian Current (NBC) retroflection is then lightly weaker in presence of the Amazon runoff.
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