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Accueil du site → Doctorat → Inde → 2017 → In situ and remote sensing measurements of atmospheric aerosols over peninsular india

Jawaharlal Nehru Technological University, Anantapuram (2017)

In situ and remote sensing measurements of atmospheric aerosols over peninsular india

S. Nazeer Hussain

Titre : In situ and remote sensing measurements of atmospheric aerosols over peninsular india

Auteur : S. Nazeer Hussain

Université de soutenance : Jawaharlal Nehru Technological University, Anantapuram

Grade : Doctor of Philosophy (PhD) 2017

Résumé partiel
Atmospheric aerosols which are minute suspended particles in the atmosphere happen to be one of the key components to alter several major atmospheric phenomena such as radiation budget, cloud and precipitation formation, visibility, etc. These particles’ interaction with solar radiation takes place through absorption and scattering process. Black carbon (BC) aerosols are one of the significant refractory components of carbonaceous particles (categorized as black/graphitic carbon and organic carbon) in atmospheric aerosols. A BC aerosol is the most powerful climate forcing agent and is ahead of methane and just inferior to carbon dioxide. These are produced as the by-products of incomplete combustion of fossil fuels (solid bio-fuels, coal, and diesel) and crop residue. We conducted near surface Black Carbon (BC) mass concentration measurements at semi-arid rural (Anantapur) and tropical wet and dry urban (Tirupati) locations in Peninsular Indian state of Andhra Pradesh from June 1 to June 30, 2015. We studied diurnal variations and weekdays/weekends differences of BC mass Concentration, and its correlations with meteorological parameters for two sites. BC exhibits a strong weekly cycle in which weekend concentrations are significantly lower than weekday concentrations by 14% and 31% for ATP and TPTY due to the decrease in the local traffic volumes during weekends which is known as ‘weekend effect’. An estimated percentage of contribution of BC indicates the main sources of BC as fossil fuel combustion which is dominantly observed at TPTY than at ATP. Finally, the influence of the transported air masses on episodes has also been discussed with the help of HYSPLIT air mass backward trajectories. Satellite measurements are providing advances in understanding the climate changes across the globe by quantifying spatio-temporal states of the atmosphere, land and oceans. Present investigation describes the temporal and spatial changes in AOD and FMF over peninsular India during 2005-2014 by using MODIS sensor onboard Aqua and Terra satellites. The monthly mean Aerosol Optical Depth and Fine Mode Fraction are drawn for trend analysis of long term aerosol loading over observation site.

Mots clés : Black carbon components of carbonaceous meteorological Peninsular Physics

Présentation et version intégrale (Shodhganga)

Page publiée le 25 février 2021