Journal article

Cloud condensation nuclei measurements in the marine boundary layer of the Eastern Mediterranean: CCN closure and droplet growth kinetics

Bougiatioti A, Fountoukis C, Kalivitis N, Pandis S, Nenes A, Mihalopoulos N ...see all

Atmospheric Chemistry and Physics, vol. 9, issue 18 (2009) pp. 7053-7066

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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 similar to 0.6%
supersaturation, characteristic of the aged nature of the aerosol
sampled. Application of Kohler 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%; r(2)=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.

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  • a. Bougiatioti

  • C. Fountoukis

  • N. Kalivitis

  • S. N. Pandis

  • a. Nenes

  • N. Mihalopoulos

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