Geoscience Reference
In-Depth Information
Fig. 16 a The warming trend of
the HadISST over the equatorial
Indian Ocean of the two periods
1891-1960 and 1951-2010 is
shown b The decreasing trend of
monsoon depression frequency
during the two periods
1891-1960 and 1950-2010 is
shown
(a)
(b)
decreased slightly. But, from 1950 to 2010, SST had a rapid increasing trend, and corre-
spondingly, monsoon depressions showed rapid decreasing trend from about 10 depres-
sions in 1950s to about 3 in 2000s. In this connection, reference is drawn to the study by
Krishnamohan et al. (
2012
).
6 Summary and Conclusions
Latent heating of the atmosphere by the deep convection in the ITCZ of the tropical oceans
is as important if not more than by the solar heating of the Eurasian land mass in boreal
summer for the establishment of the Asian summer monsoon. Monsoon onset over south
Asia and its inter-annual variability are closely associated with the changes in SST of the
tropical Indian and Pacific Oceans. This paper has highlighted the importance of oceans in
the variability of Indian monsoon rainfall on intra-seasonal, inter-annual and inter-decadal
