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Advances in Meteorology
Volume 2014 (2014), Article ID 197072, 8 pages
http://dx.doi.org/10.1155/2014/197072
Research Article

Radiative Impact of Fireworks at a Tropical Indian Location: A Case Study

1Department of Geophysics, Banaras Hindu University, Varanasi 221005, India
2Indian Institute of Tropical Meteorology (Branch), Prof. Ram Nath Vij Marg, New Delhi 110060, India
3Radio and Atmospheric Sciences Division, National Physical Laboratory, New Delhi 110012, India
4Department of Physics, Banaras Hindu University, Varanasi 221005, India
5Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi 221005, India

Received 22 August 2013; Accepted 21 October 2013; Published 22 January 2014

Academic Editor: Sachin D. Ghude

Copyright © 2014 B. P. Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

During Diwali festival, extensive burning of crackers and fireworks is made. Weeklong intensive observational campaign for aerosol study was carried out at a representative urban location in the eastern Indo-Gangetic Plain (IGP), Varanasi (25.3°N, 83.0°E), from October 29 to November 04, 2005 (Diwali on November 01, 2005), to investigate behavioral change of aerosol properties and radiative forcing between firework affected and nonaffected periods. Results show a substantial increase (~27%) in aerosol optical depth, aerosol absorption coefficients, and aerosol scattering coefficients during affected period as compared to non-affected periods. Magnitudes of radiative forcing at top of atmosphere during affected and non-affected periods are found to be +10 ± 1 and +12 ± 1 Wm−2, respectively, which are −31 ± 7 and −17 ± 5 Wm−2, respectively, at surface. It suggests an additional cooling of ~20% at top of atmosphere, ~45% cooling at surface, and additional atmospheric heating of 0.23 Kday−1 during fireworks affected period, which is ~30% higher than the non-affected period average.