Other
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3404704r&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 4, CiteID L04704
Other
3
Biogeosciences: Climate Dynamics (1620), Atmospheric Processes: Precipitation (1854), Atmospheric Processes: Tropical Meteorology, Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513)
Scientific paper
Most of the severe droughts over India are associated with El Niño. However, only less than half of El Niño events are associated with deficient rainfall over India. In other El Niño years, Indian summer monsoon rainfall (ISMR) was either normal or excess. A recent study suggested that the El Niño events with the warmest SST anomalies in the central Pacific are more effective in focusing drought producing subsidence over India than events with the warmest SST anomalies in the eastern equatorial Pacific. They have further suggested that the incorporation of additional information on the spatial distribution of SST anomalies over the equatorial Pacific Ocean in the statistical models should improve monsoon forecast skill. The present study explores this hypothesis on the skill of monsoon forecasts by analyzing SST data for the period 1880-2004. The present study reveals that incorporation of information on the spatial pattern of SST anomalies (by incorporating the Trans Niño Index) does not improve the association between El Niño and Indian monsoon rainfall. Simply using the SST index over the central Pacific (Niño-3.4) may be a better indicator for the association than the Combined Niño Index derived from Niño-3 and Trans Niño Index (TNI).
Pai D. S.
Rajeevan M.
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