I am currently a fifth year BS-MS student in Department of Earth Science, IISER Kolkata.My research focus on monsoon dynamics, isotope modelling, Air-Sea Interaction, Statistical climatology.Currently I am working with Prof.Prasanta Sanyal in SILIKA Lab.
In past 58 years the northern Indian Ocean shows an increasing pattern in temperature whereas the continent part shows a decreasing pattern which ultimately plays a crucial role in decreasing precipitation
In past 58 years, a decreasing trend in precipitation is observed in central and central east India whereas an increasing trend in east-coast and central-southern India.This decrease in precipitation is mainly attributed by the weakening of land-sea temperature gradient.
It is believed that the Monsoon system got initiated relatively recently in the geological past (about 20 Ma ago) due to uplift of Himalayas/Tibetan plateau beyond a critical height which establishes a high altitude low pressure zone (Tibetan Plateau) during summer. But how the Monsoon evolved with time and if there were times of major changes is still not clear.
Our research goal is to understand the monsoonal rainfall variations and its causes. We are also trying to find out the effect of monsoon variations in ecosystem especially on vegetation. Additionally, climate forcing on river and landform evolution is also an important aspect of our research.
The warming Indian Ocean also plays a role in weakening the monsoon circulation. Increased warming in the ocean enhances the large-scale upward motion of warm moist air over the equatorial ocean. This enhanced upward motion over the ocean is compensated by subsidence of dry air over the subcontinent, inhibiting convection and rainfall over the Indian landmass. This means that a warming Indian Ocean has resulted in surplus rains over the ocean at the cost of the monsoon rains over land, simultaneously drying the Indian subcontinent.
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