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Observations of the Madden Julian Oscillation during Indian Ocean Dipole events
Author(s) -
Wilson Earle A.,
Gordon Arnold L.,
Kim Daehyun
Publication year - 2013
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/jgrd.50241
Subject(s) - madden–julian oscillation , indian ocean dipole , climatology , indian ocean , convection , subtropical indian ocean dipole , environmental science , oscillation (cell signaling) , geology , atmospheric sciences , oceanography , el niño southern oscillation , meteorology , geography , chemistry , biochemistry
The characteristics of Madden Julian Oscillation (MJO) development and propagation during Indian Ocean Dipole (IOD) events are presented in this study. We find that MJO activity over the Indian Ocean and Maritime Continent is enhanced during negative IOD and subdued during positive IOD. MJO events occurring during positive IOD have weaker convection and less organized wind anomalies than those occurring during neutral or negative IOD. These differences are starkest over the eastern Indian Ocean where the IOD has the greatest effect on low‐level humidity. Based on these observations and current MJO theories, we posit that the IOD primarily influences the MJO through its modulation of local low‐level moisture.