New Tales of the Stratospheric Sudden Warming

Presenter: 
Dr. Var Limpasuvan, School of Coastal and Marine Systems Science (CCU)
Event Location: 
BCCMWS 100
Event Date: 
Thursday, November 19, 2015 - 3:00pm
Event Type: 
SCMSS Seminar Series

Abstract

The major stratospheric sudden warming (SSW) phenomenon occurs when the wintertime polar stratosphere undergoes a tremendous warming (~20 degrees Kelvin) in a few weeks and the circumpolar stratospheric flow (defining the “polar vortex”) becomes highly distorted. Over the past 25 years, the SSW has been linked downward to the leading modes of surface climate variability like the Arctic Oscillation, which governs the latitudinal fluctuation of the Jet Stream. Based on a global climate-chemistry model as well as global and local observations, this talk highlights new findings of the SSW’s upward impact. Results demonstrate the remarkable role of planetary-scale wave disturbances in communicating SSW effects through the mesosphere and across the equator, altering the global distribution of trace chemical constituents.