Abstract
The simultaneous measurements of black carbon (BC, based on Aethalometer) and elemental carbon (EC, using thermo-optical EC–OC analyzer) in airborne particles collected from an urban location (Kanpur) in northern India are reported here. The strategy for site-selection is most relevant in order to assess the relative dominance of emissions from coal-fired industries, fossil–fuel combustion and biomass burning on the seasonal variability of EC (BC) concentrations. An inter-comparison of the analytical data ( n = 32) suggests that BC mass concentration is ∼ 20% higher than that of EC. However, attenuation coefficient ( b ATN) measured by the two analytical instruments shows good agreement (slope = 0.97, n = 27), establishing the validity of b ATN derived from thermo-optical EC–OC analyzer. Furthermore, slope (20.7 m 2 g − 1 ) of a linear-fit to the data ( n = 48, R 2 = 0.86) for surface EC concentration (EC s ≤ 8 μg C cm − 2 ) and optical-attenuation (ATN ≤ 180) measured at 678 nm on thermo-optical analyzer provides an independent and novel way of determining the “site-specific” attenuation cross-section ( σ ATN).
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