[Eoas-seminar] EOAS Colloquium Speaker Friday Sept 14

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Fri Sep 7 16:46:09 EDT 2018


Dr. Zhaohua Wu will give the next EOAS Colloquium on Sept 14 in CAR 101 
at 3:30.

We look forward to seeing you there!

*Deep Atlantic Ocean Warming: Its Evolution Structure and Dynamics*


Increased heat storage in deep oceans has been proposed to account for 
the slowdown of global surface warming since the end of twentieth 
century. How the imbalanced heat at the surface has been redistributed 
to deep oceans remains to be elucidated. Here, the evolution of deep 
Atlantic Ocean heat storage since 1950 on multidecadal or longer 
timescales is revealed. The anomalous heat in the deep Labrador Sea was 
transported southward by the shallower core of the deep western boundary 
current (DWBC). Upon reaching the Equator around 1980, this heat 
transport route bifurcated into two, with one continuing southward along 
the DWBC and the other extending eastward along a narrow strip (about 
four-degree width) centered at the Equator. In 1990s and 2000s, 
meridional diffusion helped to spread warming in the tropics, making 
eastward equatorial warming extension have a narrow head and wider tail. 
The deep Atlantic Ocean warming since 1950 had overlapping variability 
of approximately sixty years.

The results suggest that the current basin-wide Atlantic Ocean warming 
at depths of 1000-2000 m can be traced back to the subsurface warming in 
the Labrador Sea in 1950s. An inference from these results is that the 
increased heat storage in the twenty-first century in deep Atlantic 
Ocean is unlikely to partly account for the atmospheric radiative 
imbalance during the last two decades and to serve as an explanation for 
the current warming hiatus.

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