ENSO amplitude modulation related to Pacific decadal variability

Details ENSO amplitude modulation related to Pacific decadal variability ENSO amplitude modulation related to Pacific decadal variability

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603706i&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 3, CiteID L03706

Physics

1

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Global Climate Models (3337, 4928), Oceanography: Physical: Enso (4922)

Scientific paper

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.

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