Using the Aethalometer for Source Apportionment of Carbonaceous Aerosols

Atmospheric aerosols are present everywhere on the planet in various concentrations.It has been shown that aerosols affect the climate.Some aerosols, like soot, absorbs light and heat the climate while mineral dust particles scatter light and thereby cools the climate.This contradiction leads to uncertainties of the net effect of aerosols on the climate, it is thus important to characterize the aerosols and their sources.Source apportionment of the carbonaceous fraction of the aerosol is an important tool for evaluate the influence of the sources.It is performed by using multiple measurement techniques to provide a comprehensive picture of the sources.The aethalometer is a real time optical instrument which measures the absorption of light by aerosols.By measuring the absorption at seven wavelengths it is possible to deduce a spectral dependence of the aerosols.It turns out that this dependence differs depending on the constituents of the measured particle, it is thus possible to trace the sources.

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