CGD Seminar Series - Zane Martin, The relationship between the Madden-Julian oscillation and the quasi-biennial oscillation: Observations and GCM modeling

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

Speaker: Zane Martin, Colorado State University

Date: Tuesday 22 September, 2020

Time: 11 am - 12 pm

For Zoom viewing information contact Tracy Baker, tbaker@ucar.edu

Abstract:

Recent observational studies have demonstrated a strong and sprprising 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.

For more information contact Tracy Baker, tbaker@ucar.edu, 303-497-1366

Type of event:

Will this event be webcast to the public by NCAR|UCAR?: 
No
Announcement Timing: 
Monday, September 21, 2020 to Tuesday, September 22, 2020
Calendar Timing: 
Tuesday, September 22, 2020 - 11:00am to 12:00pm MDT

Posted by Tracy Baker at ext. 1366, tbaker@ucar.edu

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