10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Influence of Diwali Fireworks on Air Quality and Aerosol Optical Properties over a Mega City Delhi
SATEESH M., Vijay Kumar Soni, Raju P.V.S., India Meteorological Department
Abstract Number: 645 Working Group: Air Quality in Megacities: from Sources to Control
Abstract Ten days intensive observational studies of aerosols properties and air quality have been carried out at mega city Delhi, the national capital of India. During the Diwali festival fire crackers are burnt extensively in Northern part of India. The Skyradiometer data from Skynet-India along with ambient air pollution data were analyzed for the period November 09-18, 2012. Aerosol radiative forcing and heating rate was calculated using SBDART model.
Aerosol Optical Depth (AOD) value increased to as high as 2.55 and 0.45 for the wavelengths 340 and 1020 nm respectively. Single Scattering Albedo (SSA) increased to 0.996 at 500 nm and 0.863 at 1020 nm on the Diwali. Asymmetry Parameter (ASY) increased to a maximum of 0.79 for the shorter wavelength at 340 nm and 0.6 is reported at the higher wavelength 1020 nm. The real part of the Refractive index was observed to be 1.625 at 1020 nm and 1.4467 at 340 nm. The imaginary part of the refractive index decreased to -0.01766 at 1020 nm and -0.00031 at 340 nm. It has a good correlation of 90% with observed AOD and MODIS data, standard deviation of 0.31 and a RMSE of 0.17 for the Diwali period. Heating rate of 1.8 oC.day-1 in the 1km layer, 0.4oC.day-1 in the 10 km layer was observed. There is a 28W.m-2 radiative forcing trapped within the atmosphere for the first day of the diwali and a 30W.m-2 is trapped on the second day of the Diwali. And it is increased to 34 W.m-2 for the next three days (SBDART-Model). The concentration of PM10 and PM2.5 was reported as maximum of 2641 μg.m-3 and 1876 μg.m-3 respectively on the Diwali day. Concentration of SO2 varied between 13 to 88 μg.m-3 during the Diwali period. A highest of 109 ppb surface ozone is reported in the night time 23:00 IST, where the NOX is 63.7 ppb and NO2 is 23.2 ppb.