Sketch of the circulation in three dimensions in estuaries (northern hemisphere).a) slightly stratified estuary with weak Coriolis effect; b) slightly stratified estuary with strong Coriolis effect; c) vertically mixed estuary with Coriolis effect.
Full lines indicate isohalines. The broken line indicates the boundary between the upper and lower layer; the upper layer is shaded. Purple arrows indicate upper layer currents, magenta arrows indicate lower layer currents. The situation in the southern hemisphere is the mirror image with respect to the estuary axis.
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