SEASONAL VARIABILITY OF MODE-1 AND MODE-2 INTERNAL SOLITARY WAVES OFF THE AMAZON SHELF OBSERVED FROM MODIS/TERRA SUNGLINT IMAGES.

This study focuses on the Amazon ISWs occurrence, their
velocity/wavelength, and variability at seasonal cycles.
The analysis is based on a data set composed of 71
MODIS/TERRA images, where more than 250 internal
solitary wave (ISW) signatures were identified in the sun glint
area. ISWs packets separated by typical mode-1 and mode-2
internal tides (ITs) wavelengths have been identified and
mapped coming from sites A, and B. In area B, the mode-1
and mode-2 ISWs seem to have lower wavelengths than the
ones in area A. Mode-1 ISWs from site A showed higher
wave velocity/wavelength during the boreal summer/fall,
with higher diversity in terms of propagation velocities.
Calculations of the IT velocities using the Taylor-Goldstein
equation supported our results of shorter-scale ISWs
associated with mode-2 IT wavelengths in the study area and
additionally into the ISW/IT seasonal variability.