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contributor authorMarshall, A. G.
contributor authorAlves, O.
contributor authorHendon, H. H.
date accessioned2017-06-09T16:23:07Z
date available2017-06-09T16:23:07Z
date copyright2009/04/01
date issued2009
identifier issn0022-4928
identifier otherams-66909.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208297
description abstractThe ocean dynamics of the Madden?Julian oscillation (MJO) and its interaction with El Niño?Southern Oscillation (ENSO) are assessed using a flux-corrected coupled model experiment from the Australian Bureau of Meteorology. The model demonstrates the correct oceanic Kelvin wave response to the MJO-related westerly winds in the western Pacific. Although there may be a role for the MJO in influencing the strength of El Niño, its impact is difficult to separate from that of strong heat content preconditioning of ENSO. Hence, the MJO?ENSO relationship is assessed starting from a background state of low heat content anomalies in the western Pacific that are also characteristic of recent observed El Niño events. The model shows a strong relationship between ENSO and the MJO near the peak of El Niño. At this time, the sea surface temperature (SST) anomaly is largest in the central Pacific, and it is difficult to separate cause and effect. Near the onset of El Niño, however, when Pacific Ocean SST anomalies are near zero, an increase in MJO activity is associated with Kelvin wave activity and stronger subsequent ENSO warming. A significant increase in the number of MJO events, rather than the strength of individual MJO events, leads to stronger eastern Pacific warming; the MJO appears not to be responsible for the occurrence of El Niño itself, but, rather, is important for influencing its development thus. This research supports a role for downwelling oceanic Kelvin waves and subsequent deepening of the thermocline in contributing to eastern Pacific warming during the onset of El Niño.
publisherAmerican Meteorological Society
titleA Coupled GCM Analysis of MJO Activity at the Onset of El Niño
typeJournal Paper
journal volume66
journal issue4
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/2008JAS2855.1
journal fristpage966
journal lastpage983
treeJournal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 004
contenttypeFulltext


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