Author/Authors :
H. Eichler، نويسنده , , Y.F. Cheng، نويسنده , , W. Birmili، نويسنده , , A. Nowak، نويسنده , , A. WIEDENSOHLER، نويسنده , , E. Brüggemann، نويسنده , , T. Gnauk، نويسنده , , H. Herrmann، نويسنده , , D. Althausen، نويسنده , , A. Ansmann، نويسنده , , R. Engelmann، نويسنده , , D. V. Giri and F. M. Tesche، نويسنده , , M. WENDISCH، نويسنده , , Y.H. Zhang، نويسنده , , M. Hu، نويسنده , , S. Liu، نويسنده , , L.M. Zeng، نويسنده ,
Abstract :
During the “Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2004 (PRIDE-PRD2004)” hygroscopic properties of particles in the diameter range 22 nm to were determined. For that purpose, a Humidifying Differential Mobility Particle Sizer (H-DMPS) and a Micro-Orifice Uniform Deposition Impactor (MOUDI) were operated. The derived size-dependent particle hygroscopic growth factors were interpolated to ambient relative humidity (RH) and used to calculate the particle number size distributions (PNSDs) at ambient conditions. A comparison between the modeled particle extinction coefficients (σext,Mie) and those observed with a Raman lidar was made. It is shown that the particle extinction coefficient (σext) at ambient RH can be properly estimated with Mie-model calculations based on the in situ physico-chemical measurements of dry and humidified PNSD and chemical composition.
Keywords :
Descriptive hygroscopic growth factor , H-DMPS , PRD , Particle extinction coefficient , Hygroscopicity
