Mary Gilles — Lawrence Berkeley National Laboratory
Category
Aerosol Mixing State
Description
Size of impacted organic particles as a function of the optical thickness of carbon (total carbon absorption). Solid lines: best fit lines for the ambient particles, dashed lines: best fit lines for the laboratory generated particles. The red and blue triangles highlight the different regions in which the two classes of particles fall.
The phase state of ambient and laboratory generated aerosol particles were investigated using scanning transmission x-ray microscopy/near-edge x-ray absorption fine structure spectroscopy (STXM/NEXAFS). The phase states of the organic particles were determined from measurements of their size and optical density. A comparison is made between the observed phase states of ambient samples collected during field campaigns in North and South America and of laboratory generated aerosols to determine how well laboratory samples represent the phase of ambient samples. Here we present results showing that the laboratory samples all deform more upon impaction than the ambient particles and that the ambient particles have, on average, very similar extents of deformation despite their varied locations.
Lead PI
Mary Gilles — Lawrence Berkeley National Laboratory
