Haze and its relation to atmospheric accumulation aerosol

  • Berner A
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Under humid conditions, particles of the atmospheric aerosol, especially those of the accumulation aerosol, grow by condensation of water. This wet aerosol, the haze, can be sampled by cascade impactors, directly from the atmosphere and without disturbing the state of the wet particles before collection. By using a dual impactor technique, one obtains the distributions of the haze and its dry precursor, i.e. the accumulation aerosol. Both size distributions are unimodal and an average growth factor can be determined from the shift of the distributions. Initial field experiments indicate growth factors of up to five. This is a considerable increase in size, and impaction becomes a fairly effective process for removing wet particles from the atmosphere. Therefore, when compared with the accumulation aerosol, the environmental impacts of the related haze must be considerably stronger. © 1989.

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  • A. Berner

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