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)