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Stratospheric Control of the Madden-Julian Oscillation

Title
Stratospheric Control of the Madden-Julian Oscillation
Authors
Son, Seok-WooLim, YunaYoo, ChanghyunHendon, Harry H.Kim, Joowan
Ewha Authors
유창현
SCOPUS Author ID
유창현scopus
Issue Date
2017
Journal Title
JOURNAL OF CLIMATE
ISSN
0894-8755JCR Link1520-0442JCR Link
Citation
vol. 30, no. 6, pp. 1909 - 1922
Publisher
AMER METEOROLOGICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Interannual variation of seasonal-mean tropical convection over the Indo-Pacific region is primarily controlled by El Nino-Southern Oscillation (ENSO). For example, during El Nino 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 Nino winters and contract toward the western Pacific during La Nina 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.
DOI
10.1175/JCLI-D-16-0620.1
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일반대학원 > 대기과학공학과 > Journal papers
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