Potential role of aerosol over high precipitation events in North East India

Kumar, Sukanya (2021) Potential role of aerosol over high precipitation events in North East India. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Sukanya Kumar (16MS195)) 16MS195_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

The thesis uses 20 years (2000-2019) data of daily precipitation, aerosol optical depth, boundary layer height and moist static energy over the North East India. This presents variation of rainfall during monsoon season over the North East India and also investigates the high precipitation events (daily rainfall > 95th percentile) which are very common over the study region. Variation of rainfall has been observed between Upper and Lower part of the North East India. Daily rainfall is found to be decreasing over the past two decades during monsoon and during high precipitation events. Lower North east India is found to be received more rainfall compared to the upper North East India. Also, aerosol loading and moist static energy (1000–850 hPa) over the region of lower north east India is found to be higher whereas the boundary layer height is shallower, compared to the upper part. Aerosol loading and moist static energy has increased whereas the boundary layer height has completely opposite trends over the past two decades in both part of NEI. Composite analysis of all these co-located data sets of the meteorological parameters (aerosol optical depth, boundary layer, moist static energy) for high precipitation events is done to understand the inherent dynamics and linkages between the aerosol optical depth and high precipitation events. Strong correlations have been found over the study region between high aerosol concentration in the atmosphere and high rainfall, high moist static energy and low boundary layer height. The finding features that aerosols may a potential role in the high precipitation events during monsoon season over the study region along with the influence of orography.

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