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where baroclinc instability favours if stronger is the shear (Dash et al., 2004).
But as shown in Fig. 2e, they have been reduced to 0 from 2.5 over for whole
monsoon for the period during 1891-2011. However, number of SCS, as shown
in Fig. 2f for post-monsoon shows significant increase during 1950 to 1971
from 1 to 2.5 and then decrease to 0.7 in 2011 while their frequencies in
Fig. 2 (a to c): Amplitude and epochal periodicity using anomalies of total intense
cyclonic systems over Indian region, BoB and AS from 11-years running means for
121 years (1891-2011) (a) annual frequencies of D and above, SCS and above for
whole Indian region (b-c) same but for BoB and AS. (d to f ): Season-wise (pre-monsoon,
monsoon and post-monsoon) breakup of decadal variability and trend of various intense
cyclonic systems over Indian region, from 11-years running means for 121 years (1891-
2011): (d) frequencies of Dep and above, (e) Monsoon cyclones (f ) SCS and above for
whole India.
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