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Webinar: The relationship between the Madden-Julian oscillation and the quasi-biennial oscillation: Observations and GCM modeling

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Tuesday, 22 September 2020, 1:00

Tuesday, September 22, 2020. 1:00 PM Eastern. Webinar: The relationship between the Madden-Julian oscillation and the quasi-biennial oscillation: Observations and GCM modeling. Zane Martin, Colorado State University. Sponsored by NCAR. More information here.

Recent observational studies have demonstrated a strong and surprising link between two key modes of tropical variability: the Madden-Julian oscillation (MJO) and the stratospheric quasi-biennial oscillation (QBO). After briefly reviewing these two phenomena, we discuss the main components of the MJO-QBO relationship, including the key takeaway that when QBO winds in
the lower stratosphere are easterly, the MJO tends to be stronger and more predictable during boreal winter. We then present results from a series of GCM modeling studies that explore whether the observed MJO-QBO link can be captured. In a variety of different model types and experiments, we find that models struggle to clearly demonstrated the strong observed link. The continuing challenge of realistically capturing the MJO-QBO link for a wide range of models is discussed, as well as the implications for the observed relationship and possible directions for future work on this topic.

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