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at the rim of the gyre, where the parent originating from return Atlantic water and that coming from inside-gyre surface waters,
 

Summary: at the rim of the gyre, where the parent originating from return
Atlantic water and that coming from inside-gyre surface waters,
meet and mix. Because these coherent eddies are stable for ,1 year,
they may also precondition water masses for convective activity in
the following winter season. They could then form foci to concen-
trate further convection4,11,12
after erosion of the layer of less dense
water that caps the core during the summer.
On the basis of float data only, we have direct evidence for about
eight such eddies during ESOP-2. This probably underestimates the
true number, because almost every float we released that strayed
into the rim region of the Greenland gyre in 1997 became entrained
in an anticyclonic eddy. When these eddies eventually decay, they
presumably release their core water at mid-depths in the Greenland
Sea, ventilating the intermediate water. Each eddy core has a volume
,50 km3
. Comparing the volume of water in eight eddy cores to a
total volume involved in convection of (24) 1012
m3
during

  

Source: Anderson, W. Gary - Department of Biological Sciences, University of Manitoba

 

Collections: Biology and Medicine