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Influence of water uptake on the aerosol particle light scattering coefficients of the Central European aerosol Cover

Influence of water uptake on the aerosol particle light scattering coefficients of the Central European aerosol

Open Access
|Jan 2014

Abstract

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 factorf(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 off(RH), since the magnitude off(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.

Language: English
Page range: 22716 - 22716
Submitted on: Aug 29, 2013
Accepted on: Feb 14, 2014
Published on: Jan 1, 2014
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 2014 Paul Zieger, Rahel Fierz-Schmidhauser, Laurent Poulain, Thomas Müller, Wolfram Birmili, Gerald Spindler, Alfred Wiedensohler, Urs Baltensperger, Ernest Weingartner, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.