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Interannual variability of the Madden‐Julian Oscillation and its impact on the North Atlantic Oscillation in the boreal winter
Author(s) -
Lin Hai,
Brunet Gilbert,
Yu Bin
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl064547
Subject(s) - madden–julian oscillation , climatology , teleconnection , boreal , extratropical cyclone , forcing (mathematics) , empirical orthogonal functions , indian ocean , environmental science , north atlantic oscillation , oscillation (cell signaling) , convection , geology , el niño southern oscillation , oceanography , geography , meteorology , paleontology , biology , genetics
Interannual variability of the Madden‐Julian Oscillation (MJO) and its influence on the extratropical teleconnection are analyzed. It is found that there is an interannual shift of the MJO activity between the Indian Ocean and the western central Pacific. This is reflected by the year‐to‐year changes in the occurrence frequency of individual MJO phases. The leading mode of an empirical orthogonal function analysis of occurrence frequency of MJO phases shows an out‐of‐phase relationship between MJO phase 7 and phases 3–5. During winters when the MJO convection occurs more frequently in the Indian Ocean (phases 3–5), a winter mean positive North Atlantic Oscillation (NAO) tends to occur. These results indicate that the seasonal mean convection activity over the Indian Ocean related to the MJO is a possible driving forcing for the seasonal mean NAO variability in the boreal winter.