Do strong warm ENSO events control the phase of the stratospheric QBO?

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• 作者：Bo Christiansen ; Shuting Yang ; Marianne Sloth Madsen
• 刊名：Geophysical Research Letters
• 出版年：2016
• 出版时间：16 October 2016
• 年：2016
• 卷：43
• 期：19
• 页码：10,489-10,495
• 全文大小：1.2MB
• ISSN：1944-8007

文摘

Although there in general are no significant long-term correlations between the quasi-biennial oscillation (QBO) and the El Niño–Southern Oscillation (ENSO) in observations, we find that the QBO and the ENSO were aligned in the 3 to 4 years after the three warm ENSO events in 1982, 1997, and 2015. We investigate this indicated relationship with a version of the EC-Earth climate model which includes nonorographic gravity waves. We analyze the modeled QBO in ensembles forced with climatological sea surface temperatures (SSTs) and observed SSTs. In the ensemble with observed SSTs we find a strong and significant alignment of the ensemble members in the equatorial stratospheric winds in the 2 to 4 years after the strong ENSO event in 1997. This alignment also includes the observed QBO. No such alignment is found in the ensemble with climatological SSTs. These results indicate that strong warm ENSO events can lock the phase of the QBO.