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Abstract:
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The aerosols in the atmosphere play major role in the radiation balance of the Earthatmosphere
system. Direct and indirect impact of aerosols on the weather and climate still
remains as a topic to be investigated in detail. The effect of aerosols on the radiation budget and
thereby circulation pattern is important and requires further study. A detailed analysis of the
aerosol properties, their variability and meteorological processes that affect the aerosol
properties and distribution over the Indian region is performed in the thesis. The doctoral thesis
entitled “Characteristics of aerosols over the Indian region and their variability associated
with atmospheric conditions” contains 7 chapters. This thesis presents results on the analysis
on the distribution (spatial and temporal) and characteristics of the aerosols over the Indian
region and adjoining seas. Regional and stationwise data were analysed and methods such as
modeling and statistical analysis are implemented to understand the aerosol properties,
classification and transportation.
Chapter-1 presents a brief introduction on the aerosols, their measurement techniques,
impact of aerosols on the atmospheric radiation budget, climatic and geographic features of the
study area and the literature review on the previous studies. It provides a basic understanding in
the field of study and objective of the thesis. Definition of the aerosols, their sources/sinks and
classification of the particles according to optical and microphysical properties are described.
Different measurement techniques such as sampling and remote sensing methods are explained
in detail. Physical parameters used to describe aerosol properties and effect of aerosols on the
radiation distribution are also discussed. The chapter also explains the objectives of the thesis
and description of climatic features of the study area. |