Aerosol Chemistry, and Light-Scattering and Hygroscopicity Budgets during Outflow from East Asia
Abstract
During the ACE-Asia field campaign, 41 aerosol filter samples were obtained by airborne
sampling over the ocean to the north, south and west of Japan, generally under conditions of outflow
from the Asian continent. These samples were analyzed for their water-soluble chemical components,
particularly organic species. Suites of inorganic anions, carbohydrates, organic acids and metallic elements
were identified and quantified (21 distinct species). Simultaneously, measurements were made
of the aerosol hygroscopicity and light scattering. A factor analysis performed on the compositional
data identified several sources for the aerosols sampled during the field campaign. Regression of the
light-scattering data onto tracers for each of these factors suggests that the aerosol light scattering
could be largely attributed to three of these factors: anthropogenic emissions, biomass burning, and
soil dust. Similarly, the aerosol hygroscopicity was largely consistent with an empirical mixing model
based on past measurements of the hygroscopicity of these individual aerosol types. Limited sizeresolved, aerosol composition measurements were also obtained and suggested different sources for
various chemical species.
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