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Observed connection between stratospheric sudden warmings and the Madden‐Julian Oscillation
Author(s) -
Garfinkel Chaim I.,
Feldstein Steven B.,
Waugh Darryn W.,
Yoo Changhyun,
Lee Sukyoung
Publication year - 2012
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 - 10.1029/2012gl053144
Subject(s) - madden–julian oscillation , climatology , northern hemisphere , troposphere , polar vortex , southern hemisphere , atmospheric sciences , sudden stratospheric warming , environmental science , forcing (mathematics) , oscillation (cell signaling) , geology , meteorology , geography , convection , biology , genetics
The effect of the Madden‐Julian Oscillation (MJO) on the Northern Hemisphere wintertime stratospheric polar vortex and major, mid‐winter stratospheric sudden warmings (SSWs) is evaluated using a meteorological reanalysis dataset. The MJO influences the region in the tropospheric North Pacific sector that is most strongly associated with a SSW. Consistent with this, SSWs in the reanalysis record have tended to follow certain MJO phases. The magnitude of the influence of the MJO on the vortex is comparable to that associated with the Quasi‐Biennial Oscillation and El Niño. The MJO could be used to improve intra‐seasonal projections of the Northern Hemisphere high latitude circulation, and in particular of the tropospheric Northern Annular Mode, at lags exceeding one month.