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

Tellus: Series B, Chemical and Physical Meteorology

卷:66

Laurent Poulain¹  Gerald Spindler¹  Alfred Wiedensohler¹  Thomas Müller¹  Wolfram Birmili¹  Paul Zieger²  Ernest Weingartner²  Rahel Fierz-Schmidhauser²  Urs Baltensperger² 

[1] Leibniz Institute for Tropospheric Research, Leipzig, Germany;

[2] Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Villigen, Switzerland;

关键词: aerosol particle light scattering;    hygroscopic growth;    scattering enhancement;    aerosol mass spectrometer;    field measurements;    optical closure study;   

DOI  :  10.3402/tellusb.v66.22716

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown