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Media type:
E-Article
Title:
ENSO amplitude modulation related to Pacific decadal variability
Contributor:
Imada, Y.;
Kimoto, M.
Published:
American Geophysical Union (AGU), 2009
Published in:
Geophysical Research Letters, 36 (2009) 3
Language:
English
DOI:
10.1029/2008gl036421
ISSN:
0094-8276;
1944-8007
Origination:
Footnote:
Description:
Decadal modulation of El Niño/Southern Oscillation (ENSO) amplitude is reproduced by a long‐term simulation with an atmosphere‐ocean general circulation model. A frequency of the modulation is in phase with Pacific decadal variability (PDV). A detailed analysis of the budget of sea surface temperature (SST) shows that effect of a change in anomalous zonal advection of mean temperature correlated to ENSO development has a dominant role in low‐frequency modulation of ENSO. That is because an equatorial zonal SST gradient changes periodically in the PDV cycle as a change in the background mean state for ENSO. Such characteristics are consistent with an observed climate shift and changes in ENSO characteristics that occurred in mid‐1970s.