Hygroscopic behavior of Central European atmospheric background aerosol particles in summer

Kornelia Imre, Agnes Molnár

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The hygroscopic properties of size selected regional background aerosol were studied in 8 size ranges, from 62.5 nm to 16 μm. The mass of the aerosol samples was measured gravimetrically under controlled relative humidity (RH). The data showed important variation of the mass growth (GM) as a function of the size. In the fine mode, the highest growth was found at 86% RH in the smallest particle size range (GM= 2.2), while the lowest was found in the 0.25-0.50 μm size interval (GM= 1.4). In the coarse mode, the highest growth was found in the 1-4 μm (GM = 2.1) range. Based on the inorganic ion content of the samples, the water uptake of model aerosol (determined by the Aerosol Inorganics Model (AIM)) was also calculated; and the measured and calculated mass growth rates were compared. We found that fine range particles absorb less water than the modeled aerosol. In the coarse mode, the measured mass growth rate was often higher than the value calculated. Our results showed that in the fine mode the water deficiency (difference between measured and calculated water concentrations) is the function of the total carbon concentration (TC) of the samples (e.g., at 86% RH, 1 μg m-3 TC surplus results in a 2.86 μg m-3 decrease of water concentration). On the basis of mass growth factors, particle diameter growth rates (G) were derived. At K-puszta, G varied between 1.10 and 1.50 at 86% RH. Finally, the power-law function was fitted to both the measured (γm) and calculated (γc) data. With the application of multi-linear regression, we found that the fine mode γm can be estimated by the γc and the TC concentration, conversely to the coarse mode.

Original languageEnglish
Pages (from-to)63-82
Number of pages20
JournalIdojaras
Volume112
Issue number2
Publication statusPublished - Apr 1 2008

Keywords

  • Aerosol particles
  • Organic and inorganic composition
  • Size distribution
  • Water uptake

ASJC Scopus subject areas

  • Atmospheric Science

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