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European Geosciences Union, Annales Geophysicae, 5(29), p. 955-963, 2011

DOI: 10.5194/angeo-29-955-2011

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Simulation of aerosol optical properties over a tropical urban site in India using a global model and its comparison with ground measurements

Journal article published in 2011 by D. Goto ORCID, K. V. S. Badarinath, T. Takemura ORCID, T. Nakajima
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Aerosols have great impacts on atmospheric en-vironment, human health, and earth's climate. Therefore, information on their spatial and temporal distribution is of paramount importance. Despite numerous studies have ex-amined the variation and trends of BC and AOD over In-dia, only very few have focused on their spatial distribu-tion or even correlating the observations with model sim-ulations. In the present study, a three-dimensional aerosol transport-radiation model coupled with a general circulation model. SPRINTARS, simulated atmospheric aerosol dis-tributions including BC and aerosol optical properties, i.e., aerosol optical thickness (AOT) Angström Exponent (AE), and single scattering albedo (SSA). The simulated results are compared with both BC measurements by aethalometer and aerosol optical properties measured by ground-based skyra-diometer and by satellite sensor, MODIS/Terra over Hyder-abad, which is a tropical urban area of India, for the year 2008. The simulated AOT and AE in Hyderabad are found to be comparable to ground-based measured ones. The simu-lated SSA tends to be higher than the ground-based measure-ments. Both these comparisons of aerosol optical properties between the simulations with different emission inventories and the measurements indicate that, firstly the model uncer-tainties derived from aerosol emission inventory cannot ex-plain the gaps between the simulations and the measurements and secondly the vertical transport of BC and the treatment of BC-containing particles can be the main issue in the global model to solve the gap.