Please use this identifier to cite or link to this item:
Files in This Item:
File SizeFormat 
Gong et al 2019, Characterization of aerosol properties at Cyprus.pdf8,49 MBAdobe PDFView/Open
Title: Characterization of aerosol properties at Cyprus, focusing on cloud condensation nuclei and ice-nucleating particles
Authors: Gong, X.Wex, H.Müller, T.Wiedensohler, A.Höhler, K.Kandler, K.Ma, N.Dietel, B.Schiebel, T.Möhler, O.Stratmann, F.
Publishers Version:
Issue Date: 2019
Published in: Atmospheric Chemistry and Physics Vol. 19 (2019), No. 16
Publisher: Göttingen : Copernicus GmbH
Abstract: As part of the A-LIFE (Absorbing aerosol layers in a changing climate: aging, LIFEtime and dynamics) campaign, ground-based measurements were carried out in Paphos, Cyprus, to characterize the abundance, properties, and sources of aerosol particles in general and cloud condensation nuclei (CCN) and ice-nucleating particles (INP) in particular. New particle formation (NPF) events with subsequent growth of the particles into the CCN size range were observed. Aitken mode particles featured k values of 0.21 to 0.29, indicating the presence of organic materials. Accumulation mode particles featured a higher hygroscopicity parameter, with a median k value of 0.57, suggesting the presence of sulfate and maybe sea salt particles mixed with organic carbon. A clear downward trend of k with increasing supersaturation and decreasing dcrit was found. Super-micron particles originated mainly from sea-spray aerosol (SSA) and partly from mineral dust. INP concentrations (NINP) were measured in the temperature range from-6:5 to-26:5 °C, using two freezing array-type instruments. NINP at a particular temperature span around 1 order of magnitude below-20 °C and about 2 orders of magnitude at warmer temperatures (T >-18 °C). Few samples showed elevated concentrations at temperatures >-15 °C, which suggests a significant contribution of biological particles to the INP population, which possibly could originate from Cyprus. Both measured temperature spectra and NINP probability density functions (PDFs) indicate that the observed INP (ice active in the temperature range between-15 and-20 °C) mainly originate from long-range transport. There was no correlation between NINP and particle number concentration in the size range> 500 nm (N>500 nm). Parameterizations based on N>500 nm were found to overestimate NINP by about 1 to 2 orders of magnitude. There was also no correlation between NINP and particle surface area concentration. The ice active surface site density (ns) for the polluted aerosol encountered in the eastern Mediterranean in this study is about 1 to 3 orders of magnitude lower than the ns found for dust aerosol particles in previous studies. This suggests that observed NINP PDFs such as those derived here could be a better choice for modeling NINP if the aerosol particle composition is unknown or uncertain.
Keywords: aerosol formation; aerosol property; cloud condensation nucleus; concentration (composition); hygroscopicity; parameterization; particulate matter; supersaturation; Cyprus; Paphos
DDC: 550
License: CC BY 4.0 Unported
Link to License:
Appears in Collections:Umweltwissenschaften

This item is licensed under a Creative Commons License Creative Commons