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Modulation of the boreal wintertime Madden-Julian oscillation by the stratospheric quasi-biennial oscillation

Title
Modulation of the boreal wintertime Madden-Julian oscillation by the stratospheric quasi-biennial oscillation
Authors
Yoo, ChanghyunSon, Seok-Woo
Ewha Authors
유창현
SCOPUS Author ID
유창현scopus
Issue Date
2016
Journal Title
GEOPHYSICAL RESEARCH LETTERS
ISSN
0094-8276JCR Link1944-8007JCR Link
Citation
vol. 43, no. 3, pp. 1392 - 1398
Keywords
MJOQBOintraseasonal variabilityinterannual variability
Publisher
AMER GEOPHYSICAL UNION
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Madden-Julian oscillation (MJO), the dominant mode of intraseasonal variability in the tropical troposphere, has a significant impact on global weather and climate. Here we present that the year-to-year variation of the MJO activity shows significant changes with the quasi-biennial oscillation (QBO) in the tropical stratosphere. Specifically, the boreal winter MJO amplitude, evaluated by various metrics, is typically stronger than normal during the QBO easterly phase at 50hPa and weaker than normal during the QBO westerly phase at 50hPa. This relationship, which is possibly mediated by the QBO-related static stability and/or vertical wind shear changes in the tropical upper troposphere and lower stratosphere, is robust whether or not the activeness of the MJO or QBO is taken into account. This result suggests a new potential route from the stratosphere that regulates the organized tropical convection, helping to improve the prediction skill of the boreal winter MJO.
DOI
10.1002/2016GL067762
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일반대학원 > 대기과학공학과 > Journal papers
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