Cloud condensation nuclei measurements in the marine boundary layer of the eastern Mediterranean

CCN closure and droplet growth kinetics

A. Bougiatioti, Christos Fountoukis, N. Kalivitis, S. N. Pandis, A. Nenes, N. Mihalopoulos

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

Measurements of cloud condensation nuclei (CCN) concentrations (cm -3) between 0.2 and 1.0% supersaturation, aerosol size distribution and chemical composition were performed at a remote marine site in the eastern Mediterranean, from September to October 2007 during the FAME07 campaign. Most of the particles activate at ∼0.6% supersaturation, characteristic of the aged nature of the aerosol sampled. Application of Köhler theory, using measurements of bulk composition, size distribution and assuming that organics are insoluble resulted in agreement between predicted and measured CCN concentrations within 7±11% for all supersaturations, with a tendency for CCN underprediction (16±6%; r2=0.88) at the lowest supersaturations (0.21%). Including the effects of the water-soluble organic fraction (which represent around 70% of the total organic content) reduces the average underprediction bias at the low supersaturations, resulting in a total closure error of 0.6±6%. Using threshold droplet growth analysis, the growth kinetics of ambient CCN is consistent with NaCl calibration experiments; hence the presence of aged organics does not suppress the rate of water uptake in this environment. The knowledge of the soluble salt fraction is sufficient for the description of the CCN activity in this area.

Original languageEnglish
Pages (from-to)7053-7066
Number of pages14
JournalAtmospheric Chemistry and Physics
Volume9
Issue number18
Publication statusPublished - 2009
Externally publishedYes

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cloud condensation nucleus
supersaturation
droplet
boundary layer
kinetics
water uptake
chemical composition
particle size
aerosol
salt
calibration
experiment
water

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Cloud condensation nuclei measurements in the marine boundary layer of the eastern Mediterranean : CCN closure and droplet growth kinetics. / Bougiatioti, A.; Fountoukis, Christos; Kalivitis, N.; Pandis, S. N.; Nenes, A.; Mihalopoulos, N.

In: Atmospheric Chemistry and Physics, Vol. 9, No. 18, 2009, p. 7053-7066.

Research output: Contribution to journalArticle

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