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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 106, NO. D22, PAGES 28,711–28,718, 2001

Closure between aerosol particles and cloud condensation nuclei at Kaashidhoo Climate Observatory

Will Cantrell


Glenn Shaw


Glen R. Cass


Zohir Chowdhury


Lara S. Hughes


Kimberly A. Prather


Sergio A. Guazzotti


Keith R. Coffee


Abstract

Predicting the cloud condensation nuclei (CCN) supersaturation spectrum from aerosol properties is a fairly straightforward matter, as long as those properties are simple. During the Indian Ocean Experiment we measured CCN spectra, size-resolved aerosol chemical composition, and aerosol number distributions and attempted to reconcile them using a modified form of Köhler theory. We obtained general agreement between our measured and modeled CCN spectra. However, the agreement was not as good during a time period when organic carbon comprised a quarter of the total mass of the aerosol in the submicron size range. The modeled concentrations overpredict those actually measured during that time period. This suggests that some component, presumably organic material, can inhibit the uptake of water by the electrolytic fraction of the mass.

Received 28 June 2000; accepted 10 November 2000.

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Citation: Cantrell, W., G. Shaw, G. R. Cass, Z. Chowdhury, L. S. Hughes, K. A. Prather, S. A. Guazzotti, and K. R. Coffee (2001), Closure between aerosol particles and cloud condensation nuclei at Kaashidhoo Climate Observatory, J. Geophys. Res., 106(D22), 28,711–28,718.