Abstract
Transcritical Flow and Generation of Internal Solitary Waves off the Amazon River: Synthetic Aperture Radar Observations and Interpretation
Highlights
Diverse and dynamic features that occur on the continental shelf off the mouth of the Amazon River in the southwest tropical Atlantic Ocean (Figure 1a) include the western boundary North Brazilian Current (NBC), strong tidal constituents, and more than 1,000 km of complex bottom bathymetry (Johns et al, 1998; Hübscher et al, 2002)
The present study is motivated by an extended synthetic aperture radar (SAR) data set acquired across the Amazon River mouth that reveals for the first time the presence of high-frequency internal solitary waves (ISWs) packets propagating upstream of the NBC
“The present study provides convincing evidence of transcritical flow along the shelf and is consistent with theories of internal wave resonant generation, in which the [North Brazilian Current] flows over shallow seafloor topography and is likely to generate
Summary
Diverse and dynamic features that occur on the continental shelf off the mouth of the Amazon River in the southwest tropical Atlantic Ocean (Figure 1a) include the western boundary North Brazilian Current (NBC), strong tidal constituents, and more than 1,000 km of complex bottom bathymetry (Johns et al, 1998; Hübscher et al, 2002). A Froude number analysis considering mode-1 nonhydrostatic linear waves propagating upstream of the NBC is found to be consistent with a regime of transcritical generation in the study region.
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