When two water masses meet, which one flows under the other?
Denser flows under the less dense
The water mass that flows under the other depends on their difference in density. When two water masses meet, the denser water mass will sink below the less dense water mass. This happens because a denser water mass contains more salt, which makes it heavier than the less dense water mass that contains less salt. So, the denser water mass will sink and flow beneath the less dense water mass. This process is called “density-driven vertical mixing” and is important for ocean circulation and mixing of nutrients and heat in the ocean.
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