Physics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29q..29n&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 17, pp. 29-1, CiteID 1848, DOI 10.1029/2002GL015295
Physics
58
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305)
Scientific paper
An increase in cloud droplet number concentration resulting from an increase in ambient aerosol (and subsequent albedo increase) is typically identified as the first indirect (or ``Twomey'') climatic effect of aerosols [Twomey, 1974]. A key question is whether chemical effects (dissolution of soluble gases and slightly soluble substances, surface tension depression by organic substances and accommodation coefficient changes) could potentially rival changes in droplet number from changes in aerosol number concentration. We assess the sensitivity of cloud droplet number concentration to such chemical factors, using a cloud parcel model. We find that numerous conditions exist, for which chemical influences on cloud droplet activation can indeed rival the Twomey effect.
Charlson Robert J.
Facchini Maria Cristina
Kulmala Markku
Laaksonen Ari
Nenes Athanasios
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