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Tellus B: Chemical and Physical Meteorology Volume 54, 2002 - Issue 1
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Original Articles

The influence of the organic aerosol component on CCN supersaturation spectra for different aerosol types

Mihaela MirceaIstituto di Scienze dell’Atmosfera e dell’Oceano, Consiglio Nazionale delle Ricerche (ISAO-CNR), 40129 Bologna, Italy;
,
Maria Cristina FacchiniIstituto di Scienze dell’Atmosfera e dell’Oceano, Consiglio Nazionale delle Ricerche (ISAO-CNR), 40129 Bologna, Italy;
,
Stefano DecesariIstituto di Scienze dell’Atmosfera e dell’Oceano, Consiglio Nazionale delle Ricerche (ISAO-CNR), 40129 Bologna, Italy;
,
Sandro FuzziIstituto di Scienze dell’Atmosfera e dell’Oceano, Consiglio Nazionale delle Ricerche (ISAO-CNR), 40129 Bologna, Italy;Correspondence[email protected]
&
Robert J. CharlsonDepartments of Atmospheric Sciences and Chemistry, University of Washington,Seattle, Washington98195, USA
Pages 74-81 | Received 10 Oct 2000, Accepted 30 Oct 2001, Published online: 15 Dec 2016
 
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Abstract

This paper describes the effect of the presence of water-soluble organic compounds (WSOC) in aerosol particles on the aerosol critical supersaturation as defined by the Köhler theory and on cloud condensation nuclei (CCN) number concentration. Taking into account both the soluble mass increase and the surface tension depression due to WSOC, we calculated a substantial decrease of the aerosol critical supersaturation, which results in a large increase in CCN number concentration. CCN supersaturation spectra were computed for three different aerosol types: marine, rural and urban. The increase of CCN number concentration in the presence of WSOC (with respect to the case when only the inorganic aerosol compounds are considered) varies with aerosol type, with an increase up to 13% in the marine case, up to 97% in the rural case, and up to 110% in the urban case, for the supersaturation range typical of atmospheric conditions.

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