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SUMMARY:Upper water variability in the subpolar North Atlantic - Clare Joh
 nson (The Scottish Association for Marine Science)
DTSTART:20140416T100000Z
DTEND:20140416T110000Z
UID:TALK47492@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:The properties of the upper waters in the eastern subpolar Nor
 th Atlantic between 1996 and the present day are examined.  Around 7 Sv of
  these warm and saline waters flow northwards over the Greenland-Scotland 
 Ridge into the Nordic Seas and Arctic Ocean\, providing an estimated 250 T
 W and 245 kT/s of heat and salt to the region.  Hence variations in the su
 bpolar North Atlantic are propagated northwards.  Between 1996 and the mid
 -2000s the upper waters in the eastern subpolar North Atlantic became warm
 er (+0.72 ºC) and saltier (+0.088)\, whilst nitrate and phosphate levels 
 decreased (-2.00 μM and -0.14 μM respectively).  These changes\, out-wit
 h calculated errors\, can be explained by the varying influence of souther
 n versus subpolar water masses in the area as the Subpolar Gyre weakened a
 nd contracted.  Since the early-2000s the Subpolar Gyre has been weaker th
 an observed since 1992\, or modelled since 1960-70.  Hence upper waters wi
 thin the eastern subpolar North Atlantic\, and therefore Nordic Seas\, may
 be warmer\, saltier and more depleted in nutrients than at any time in the
  last half century.
LOCATION:British Antarctic Survey\, Room 307
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