Scavenging of black carbon in Chilean coastal fogs

摘要: In November/December 2013 a pilot experiment on aerosol/fog interaction was conducted coastal hill in the suburbs of Valparaiso, Chile. Passages garua fog were monitored with continuous recordings soot photometer and an optical aerosol spectrometer. An sensor automatic weather station provided meteorological data which could be classified. High-resolution back trajectories added information. From filter samples, chemical information derived. Scavenging coefficients black carbon (BC) measured particulate mass below 1 μm diameter (PM1) estimated three approaches. Averaging over all periods campaign yielded scavenging coefficient only 6% for BC 40% PM1. Dividing into four 90°-wind sectors gave factors ranging from 13% Vina del Mar conurbation to 50% marine sector (180°-270°). The third, independent approach achieved two pairs samples taken inside outside fogs, 25% 70% nonseasalt sulfate. Whereas fogs occurred rather infrequently beginning highly regular daily cycles appeared towards end experiment, allowed calculation typical diurnal relation passage.