Summary of Abstract Submission

Abstract Submission No. IO50-05-0057PresentationPoster

ON THE RELATION BETWEEN THE SOUTHERN ANNULAR MODE AND THE INDIAN SUMMER MONSOON AND THEIR FEEDBACKS

Suchithra Sundaram*1

1 Centre for Ocean Research, Satyabhama University, India

ABSTRACT :

The Indian summer monsoon exhibits large inter annual variations and these generates profound socio economic impact on not only over India but it affects many parts of the world through the teleconnection mechanisms. The most profound teleconnections associated with Indian Summer Monsoon (ISM) is the Elnino Southern Oscillation (ENSO) followed by Indian Ocean Dipole (IOD) and North Atlantic Oscillations (NAO). Very few studies has examined the influence of Southern Hemisphere on ISM. The present study focus on the impact of Antarctic Oscillation(AAO)/Southern Annular Mode (SAM) and the associated features on ISM. The current study attempts to understand whether the AAO/SAM which is a low frequency oscillation pertained to southern hemisphere can impact the ISM through atmospheric teleconnections. As a primary step , sixty years of NCEP Renalaysis data (1950-2010) which includes upper level parameters such as velocity potential, geopotential and stream function has been analysed which indicate that the presence of positive SAM affects the Southern Ocean high and the associated monsoon circulation during summer. The influence of short lived halogens on the atmospheric stratosphere compostion and its effect on the ozone depletion is also investigated to understand whether there exists any feed back mechanism between ISM and SAM. The reanalysis data results are verified using CMIP5 model output data set. Further analysis using model will be carried out in the later stages and the results indicates potential predictability for ISM.