This four-panel figure shows the density signatures for the month of July
during the four years of GLOBEC period in the present model simulation. The yellow
region corresponds to the LSW density range of 27.2 through 27.4 σθ.
Bluish waters are lighter, and redder waters are heavier than LSW. The advection of LSW in
the WNA from 1995 (top-left) through 1998 (bottom-right) is believed to be due to
the large drop of the NAO index during 1996. (From Chaudhuri et al., 2008)