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Influence of water uptake on the aerosol particle light scattering coefficients of the Central European aerosol
oleh: Paul Zieger, Rahel Fierz-Schmidhauser, Laurent Poulain, Thomas Müller, Wolfram Birmili, Gerald Spindler, Alfred Wiedensohler, Urs Baltensperger, Ernest Weingartner
Format: | Article |
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Diterbitkan: | Stockholm University Press 2014-03-01 |
Deskripsi
The influence of aerosol water uptake on the aerosol particle light scattering was examined at the regional continental research site Melpitz, Germany. The scattering enhancement factor f(RH), defined as the aerosol particle scattering coefficient at a certain relative humidity (RH) divided by its dry value, was measured using a humidified nephelometer. The chemical composition and other microphysical properties were measured in parallel. f(RH) showed a strong variation, e.g. with values between 1.2 and 3.6 at RH=85% and λ=550 nm. The chemical composition was found to be the main factor determining the magnitude of f(RH), since the magnitude of f(RH) clearly correlated with the inorganic mass fraction measured by an aerosol mass spectrometer (AMS). Hysteresis within the recorded humidograms was observed and explained by long-range transported sea salt. A closure study using Mie theory showed the consistency of the measured parameters.