Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 18, Pages 6538-6545Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061040
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Funding
- Robert A. Welch Foundation [A-1417]
- National Science Foundation [AGS-0938352]
- Luis Strokes Alliance for Minority Participation-Bridge to Doctorate
- National Science Foundation Graduate Research Fellowship Program (GRFP) Fellowship
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The hygroscopic growth factor (HGF) and cloud condensation nuclei (CCN) activity are measured for surrogates that mimic atmospherically relevant oligomers, including glyoxal trimer dihydrate, methyl glyoxal trimer dihydrate, sucrose, methyl glyoxal mixtures with sulfuric acid and glycolic acid, and 2,4-hexandienal mixtures with sulfuric acid and glycolic acid. For the single-component aerosols, the measured HGF ranges from 1.3 to 1.4 at a relative humidity of 90%, and the hygroscopicity parameter (kappa) is in the range of 0.06 to 0.19 on the basis of the measured CCN activity and 0.13 to 0.22 on the basis of the measured HGF, compared to the calculated values of 0.08 to 0.16. Large differences exist in the. values derived using the measured HGF and CCN data for the multi-component aerosols. Our results reveal that, in contrast to the oxidation process, oligomerization decreases particle hygroscopicity and CCN activity and provides guidance for analyzing the organic species in ambient aerosols.
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