Aerosols Of Rain Case Study

Aerosols Of Rain Case Study

Nature of Aerosols Effect on Cloud Cover and Precipitation over Central Gangetic Plain during 2012–2015 Indian Summer Monsoon Rainfall: A Case Study by using Satellite observations



Abstract: The effect of aerosol on cloud cover and precipitation is one of the hot topics in the current environmental scenario, especially during the drought conditions. The study presents the qualitative assessment of microphysical and radiative effects of aerosols on cloud cover during the Indian summer monsoon rainfall (ISMR) months of 2012, 2013, 2014 and 2015 over the highly polluted central gangetic plain by using the Absorption Fraction Feedback (the AFF) model. The years of 2012 and 2013 ISMR had witnessed normal rainfall events while 2014 ... Show more content on Helpwriting.net ...The results from the ancillary data analysis were also in agreement with results of the AFF model.



Introduction Aerosols are one of the key factors responsible for the climate change and influencing the radiation budget of the earth. Columnar Aerosol loading (amount in the atmosphere) is usually quantified by mass concentration (PM–Particulate Matter) or by an optical measure (AOD–Aerosol Optical Depth). The effects of aerosols on atmosphere are mainly categorized into four types (Lau et al., 2008). They are 1) aerosol direct effects, 2) aerosol Semi–direct effects, 3) first Indirect effects and 4) the second Indirect effects. Direct effect of aerosols is the manifestation of dimming of solar radiation by aerosols due to scattering and absorption. Due to blockage of incoming radiations, the temperature in the lower levels of the atmosphere decreases and therefore, the convection process is weakened which results in a thermodynamically stabilized atmosphere layer. This in turn, reduces the humidity in the lower layers delaying the cloud formation (semi–direct effect). The first indirect effect, which is also called Twomey Effect, explains the aerosol and cloud interactions at microphysical scale (Twomey, 1977). The changes in aerosol concentrations (aerosols act as cloud condensation nuclei (CCN)) can also alter the cloud albedo and reflectivity. The second indirect effect deals with the

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