In shallow seas that dominated subtropical regions,
warm salty water became dense enough to sink to the bottom.
Not exact matches
In this pattern,
warm waters flow northward from the tropics, then cool and
become saltier and denser as they reach higher latitudes.
But in the longer term, thousands of years from now,
waters in the North Pacific may eventually
become warm and
salty enough to establish a PMOC, just as there was in the Pliocene.
This
water warms up to the east, where it
becomes saltier and then sinks in the Levantine Sea before circulating west and exiting through the Strait of Gibraltar.
If this
water becomes slightly
warmer and a lot
saltier it could still sink and displace slightly colder and much less
salty water.
The counter-current could be interrupted when the surface
water in the Arctic
becomes less
salty and fails to sink, and the
water could
become less
salty when the
warming climate increases the Arctic rainfall.