Size-resolved cloud condensation nuclei (CCN) spectra measured for various aerosol types at a non-urban site in Germany showed that CCN concentrations are mainly determined by the aerosol number size distribution. Distinct variations of CCN activation with particle chemical composition were observed but played a secondary role. When the temporal variation of chemical effects on CCN activation is neglected, variation in the size distribution alone explains 84 to 96% of the variation in CCN concentrations. Understanding that particles' ability to act as CCN is largely controlled by aerosol size rather than composition greatly facilitates the treatment of aerosol effects on cloud physics in regional and global models.
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Penn State Univ, Inst Heart & Vasc, Milton S Hershey Med Ctr, Hershey, PA 17033 USAPenn State Univ, Inst Heart & Vasc, Milton S Hershey Med Ctr, Hershey, PA 17033 USA
机构:
Univ Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USAUniv Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USA
Takahama, S.
Liu, S.
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Univ Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USAUniv Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USA
Liu, S.
Russell, L. M.
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Univ Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USAUniv Calif San Diego, Scripps Inst Oceanog, Dept 0221, La Jolla, CA 92093 USA