Characterization of aerosols from biomass burning––a case study from Mizoram (Northeast), India

• Published in: Chemosphere (Oxford) 2004, Vol.54 (2), p.167-175
• Main Authors: Badarinath, K.V.S., Madhavi Latha, K., Kiran Chand, T.R., Gupta, Prabhat K., Ghosh, A.B., Jain, S.L., Gera, B.S., Singh, Risal, Sarkar, A.K., Singh, Nahar, Parmar, R.S., Koul, S., Kohli, R., Nath, Shambhu, Ojha, V.K., Singh, Gurvir
• Format: Article
• Language: English
• Subjects: Aerosol optical depth; Air Pollutants - analysis; Applied sciences; Atmospheric pollution; Biomass; Dispersed sources and other; Earth, ocean, space; Environmental Monitoring; Exact sciences and technology; External geophysics; Incineration; India; Meteorology; Models, Chemical; Particle Size; Particles and aerosols; Pollution; Pollution sources. Measurement results; Radiative forcing; Size distribution; Solar Energy; Turbidity; Wavelength exponent
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2003.08.032

Importance of this Paper: Biomass burning process as a source of aerosols though has been reported from different types of ecosystems all over the globe, such studies through ground-based measurements from Northeast Indian region are absent. In the study, we report for the first time aerosol emissions and its characterization from shifting cultivation area of moist tropical deciduous forests are comparatively higher than the other forest types, which is attributed mainly to dominating smoldering conditions. Physical and optical properties of biomass burning aerosols in Northeastern region, India analyzed based on measurements made during February 2002. Large spatial extent of Northeastern Region moist tropical to moist sub-tropical forests in India have high frequency of burning in annual dry seasons. Characterization of resultant trace gases and aerosols from biomass burning is important for the atmospheric radiative processes. Aerosol optical depth (AOD) observed to be high during burning period compared to pre- and post-burning days. Peak period of biomass burning is highly correlated with measured AOD and total columnar water vapor. Size distribution of aerosols showed bimodal size distribution during burning day and unimodal size distribution during pre- and post-burning days. Size distribution retrievals from biomass burning aerosols show dominance of accumulation mode particles. Weighted mean radius is high (0.22 μm) during burning period. Columnar content of aerosols observed to be high during burning period in addition to the drastic reduction of visibility. During the burning day Anderson sampler measurements showed dominance of accumulation mode particles. The diurnal averaged values of surface shortwave aerosol radiative forcing of biomass burning aerosols varies from −59 to −87 W m −2 on different days. Measured and modeled solar irradiances are also discussed in the paper.