The "Arctic Oscillation" (AO) is the dominant mode of
Northern hemisphere wintertime climate variability. Characterized by the
irregular shifting of atmospheric mass across the Arctic Circle, the
Arctic Oscillation corresponds to the North-South migration of the Jet
Stream and alteration of storm patterns. Recent studies have sown strong
dynamical coupling between the AO and variations of the stratospheric polar vortex. Downward moving wind and temperature anomalies associated
with rapid vortex breakdown appear to influence the Jet Streams and
project strongly onto the AO. In this study, a careful examination of
the AO is performed during anomalously strong vortex condition. Based on
44-year NCEP/NCAR global reanalyses data, a life cycle of a typical
vortex intensification episode is established, and then a lead-lag
composite technique is utilized (with respect to the life cycle) to find
a relationship with the AO. Our provide further suggestion of how the
stratosphere can influence the troposphere climate.
Kumar Jeeve, Varavut Limpasuvan
Department of Chemistry and Physics
Coastal Carolina University
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