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. The deposition of light-absorbing aerosol (LAA) onto snow initiatesprocesses that lead to increased snowmelt. Measurements of LAA, such asblack carbon (BC) and mineral dust, have been observed globally to darkensnow. Several measurement techniques of LAA in snow collect theparticulates on filters for analysis. Here we investigate micro-quartzfilters' optical response to BC experiments in which the particles are initiallysuspended in air or in a liquid. With particle soot absorption photometers(PSAPs) we observed a 20 % scattering enhancement for quartz filterscompared to the standard PSAP Pallflex filters. The multiple-scatteringcorrection factor ( Cref ) of the quartz filters for airborne sootaerosol is estimated to be ∼3.4 . In the next stage correctionfactors were determined for BC particles mixed in water and also for BCparticles both mixed in water and further treated in an ultrasonic bath.Comparison of BC collected from airborne particles with BC mixed in waterfilters indicated a higher mass absorption crosssection by approximately a factor of 2 for the liquid-based filters, which is probably due to the BC particlespenetrating deeper in the filter matrix. The ultrasonic bath increasedabsorption still further, roughly by a factor of 1.5, compared to only mixingin water. Application of the correction functions to earlier published fielddata from the Himalaya and Finnish Lapland yielded mass absorption coefficient (MAC) values of ∼7 –10 m 2  g −1 at λ=550  nm, which isin the range of the published MAC of airborne BC aerosol.

atmospheric measurement techniques

Multiple-scattering correction factor of quartz filters and the effect of filtering particles mixed in water: implications for analyses of light absorption in snow samples