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Stratospheric control of the madden-julian oscillation

Title
Stratospheric control of the madden-julian oscillation
Authors
Son S.-W.Lim Y.Yoo C.Hendon H.H.Kim J.
Ewha Authors
유창현
SCOPUS Author ID
유창현scopus
Issue Date
2017
Journal Title
Journal of Climate
ISSN
0894-8755JCR Link
Citation
Journal of Climate vol. 30, no. 6, pp. 1909 - 1922
Keywords
ENSOInterannual variabilityMadden-Julian oscillationQuasibiennial oscillationStratosphere-troposphere couplingTeleconnections
Publisher
American Meteorological Society
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Interannual variation of seasonal-mean tropical convection over the Indo-Pacific region is primarily controlled by El Niño-Southern Oscillation (ENSO). For example, during El Niño winters, seasonal-mean convection around the Maritime Continent becomes weaker than normal, while that over the central to eastern Pacific is strengthened. Similarly, subseasonal convective activity, which is associated with the Madden-Julian oscillation (MJO), is influenced by ENSO. The MJO activity tends to extend farther eastward to the date line during El Niño winters and contract toward the western Pacific during La Niña winters. However, the overall level of MJO activity across the Maritime Continent does not change much in response to the ENSO. It is shown that the boreal winter MJO amplitude is closely linked with the stratospheric quasi-biennial oscillation (QBO) rather than with ENSO. The MJO activity around the Maritime Continent becomes stronger and more organized during the easterly QBO winters. The QBO-related MJO change explains up to 40% of interannual variation of the boreal winter MJO amplitude. This result suggests that variability of the MJO and the related tropical-extratropical teleconnections can be better understood and predicted by taking not only the tropospheric circulation but also the stratospheric mean state into account. The seasonality of the QBO-MJO link and the possible mechanism are also discussed. © 2017 American Meteorological Society.
DOI
10.1175/JCLI-D-16-0620.1
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일반대학원 > 대기과학공학과 > Journal papers
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