A preliminary survey of the water circulation in the Amazon estuary and adjacent ocean was conducted during both low-river and high-river dischar ge. Results indicate that, due to the river's large discharge, no salt-water wedge (35‰) enters the Amazon estuary during either low-river or high-river discharge....
Gibbs, Ronald J.. 1970. "Circulation in the Amazon River estuary and adjacent Atlantic Ocean." Journal of Marine Research 28, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1177