Gang Chen

(University of California, Los Angeles)

"Dynamical mechanisms for large-scale atmospheric circulation and associated weather extremes in a warming climate"

What Meteo Colloquium
When Sep 15, 2021
from 03:30 pm to 04:30 pm
Where Zoom Webinar
Contact Name Pengfei Zhang
Contact email
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This talk is presented as a Zoom Webinar and requires a passcode. For anyone outside the department; If you would like to attend, email


Changes in the frequency or intensity of midlatitude weather extremes, such as cold spells, heat waves, or heavy precipitation, in a warming climate are associated with changes in atmospheric circulation and moisture transport. In this talk, I will first present a framework for the dynamic and thermodynamic mechanisms over the full probability distributions of precipitation using a quantile-conditional moisture budget.  It is shown that the thermodynamic effect, due to increased atmospheric moisture, is relatively uniform spatially and across the probability distribution of precipitation events.  In contrast, the dynamical effect, due to changes in intensity and location of weather systems, varies spatially and between intensities.  Then, I will present results on what controls the large-scale circulation conditions for midlatitude circulation, with a focus on jet stream meandering.  The implications for extreme moisture transport as well as temperature extremes are also discussed.