10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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The Role of Aerosol-Radiative Forcing on the Monsoon Trough Oscillations
RAJA BORAGAPU, Padmakumari B., R.S. Maheskumar, Indian Institute of Tropical Meteorology (IITM), Pune, India
Abstract Number: 1361 Working Group: Clouds and Climate
Abstract The monsoon trough (MT) which forms as an elongated low pressure system over the northwestern part of South Asia during monsoon is part of the northward shifted Inter Tropical Convergence zone (ITCZ). Changes in the strength of MT can affect land-sea thermal contrast and further affect the advancement (progression) of the monsoon circulation. Any shift in the normal MT position causes shifts in the synoptic rain-bearing systems such as depressions leading to reduced rainfall over one region and enhanced over the other. The position of MT plays a major role as its southward shift leads to active and whereas northwards to the foothills of Himalayas causing break spells. On the other hand, aerosols through its interaction with radiation can increase the atmospheric stability and weaken the strength of the trough. Recent studies have shown a drying of the northern hemisphere mainly due to the aerosol induced cooling causing a southward shift in the climatic position of the convergence zone which may directly affect the total monsoon precipitation over the core monsoon zone in Central India. Therefore, using both observational and modelling approach this work attempts to understand the role of aerosol-radiation interactions in the MT oscillations. In the present study the impact of aerosols on MT characteristics and the resultant changes in the total precipitation during active and break conditions are explored and will be presented.