Tuesday, 25 March 2003: 4:15 PM
South Atlantic variabitility and the relationship with other global features in a coupled ocean-atmosphere model
An investigation of variability in the South Atlantic is being carried
out with the output of a coupled ocean-atmosphere model (MICOM and NCAR/CCM3) run
at the Los Alamos National Laboratory (LANL). The main objective is a search for patterns
of coupled variability in the South Atlantic and the relationship with other better
known features such as the ITCZ, ENSO and NAO. Output of
two main experiments are analyzed. One is a fully coupled global ocean-atmosphere
system and the other considers exclusively the ocean, forced by climatological data.
Results of analyses of SST based on the use Empirical Orthogonal Functions (EOF) and Singular
Value Decomposition (SVD) suggest the connection of the South Atlantic
structures with larger (Atlantic) scales as already pointed out in the literature.
Indication of seasonal teleconnections and possible influence of the overturning
current, which might drive some of the observed South Atlantic's patterns are also inferred
from the analyses. These results came from an ongoing work and might certainly change
directions during the research process. However, insights of the future
results are promising and strong enough to possibly contribute to the
actual knowledge of the South Atlantic variabilities and their relations
with already known oscillations such as NAO or ENSO.
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