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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 8    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 8,August 2012
Outstanding Rainfall events of Boreal Fall Monsoon Season of Southern Peninsular India associated with the Intensification of Negative Indian Ocean Dipole
Full Text(PDF, )  PP.826-835  
Author(s)
B. V. Charlotte, George G and S. Yesodharan
KEYWORDS
Boreal fall, Dipole mode, Indian Ocean Dipole, North east monsoon, Warm pool, Wind Evaporation feedback system,
ABSTRACT
The study area southern peninsular India lying between 8?N to 13?N latitude and 70? E to 80?E longitudes enjoys both the summer and winter rain fall of Indian monsoon. The stretching of Western Ghats blocking the cross equatorial flow of south west monsoon wind creating rain shadow region of Tamil Nadu to the east coast of the region, the peninsular shape of the area, position of the land in between the dipole, proximity of Walker circulation cell to the east of the study area altogether donate an exclusive variability to the rainfall pattern to southern peninsular India compared to the rest of the country. Any major oscillations taking place in the surrounding sea can imbibe its own impact on the rhythm of rain happening in the area. This study was an attempt to understand the influence of recently found Indian Ocean dipole on boreal fall monsoon of SP. But in the course of analysis it became obvious that Indian Ocean Dipole can affect the course of rain of the area and the intensity of rain can affect the Indian Ocean Dipole vice-versa. In other words Indian Ocean Dipole and boreal fall of SP are found to be complementing each other. Hence the matter of interest of this article is simply confined to the relation between flooding boreal fall monsoon years of southern peninsular India and the subsequent state of Indian Ocean Dipole. A close analysis of various air-sea parameters during all the flooding boreal fall monsoon years of SP for last fifty year per Indian Ocean Dipole make one believe that the strong convection and associated atmospheric circulation during short living excess rainfall events work as a triggering factor for the ocean atmosphere interaction lead to the negative intensification of Indian Ocean Dipole. Another observation is that the interaction with seasonal mean boreal fall monsoon rainfall imposes a biennial tendency in the Indian Ocean Dipole. Cloud cover, surface evaporation and ocean dynamical adjustments are the three vital components of any ocean atmospheric feedback system.
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