2.5 Early Winter Upward Planetary Wave Life Cycles As a Pathway for a Radiative Ozone-Wave Influence of the Midlatitude Qbo Signal

Monday, 26 June 2017: 11:45 AM
Salon G-I (Marriott Portland Downtown Waterfront)
Vered Silverman, Tel Aviv University, Tel Aviv, Israel; and N. Harnik, K. Matthes, S. Lubis, and S. Wahl

Studies have shown that the radiative effects induced by ozone zonal asymmetries can significantly change the temperature of the winter polar cap, and correspondingly the strength of the polar vortex. It is not clear however show how these small radiative effects, which are strongest in fall, amplify to affect the mid-winter circulation. The midlatitude effect of ozone waves is found to depend on phase of the QBO in a series of runs using the Whole Atmosphere Community Climate Model (WACCM). We show a chain of events which leads from an early winter direct radiative effect on wave-mean flow interaction, to a dynamical modulation of the polar vortex, via a modulation of the stratospheric evolution of early winter upward wave pulses. In particular we find a difference in the reversibility of wave-induced decelerations between East and West QBO which is modified by ozone waves.
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