On the emerging relationship between the stratospheric Quasi-Biennial oscillation and the Madden-Julian oscillation.

ABSTRACT: A strong relationship between the quasi-biennial oscillation (QBO) of equatorial stratospheric winds and the amplitude of the Madden-Julian oscillation (MJO) during the boreal winter has recently been uncovered using observational data from the mid-1970s to the present. When the QBO is in its easterly phase in the lower stratosphere, it favors stronger MJO activity during boreal winter, while the MJO tends to be weaker during the westerly phase of the QBO. Here we show using reconstructed indices of the MJO and QBO back to 1905 that the relationship between enhanced boreal winter MJO activity and the easterly phase of the QBO has only emerged since the early 1980s. The emergence of this relationship coincides with the recent cooling trend in the equatorial lower stratosphere and the warmin

SUBMITTER: Klotzbach P 

PROVIDER: S-EPMC6393487 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature