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- Title
The relationship between cloud condensation nuclei (CCN) concentration and light extinction of dried particles: indications of underlying aerosol processes and implications for satellite-based CCN estimates.
- Authors
Shinozuka, Y.; Clarke, A. D.; Nenes, A.; Jefferson, A.; Wood, R.; McNaughton, C. S.; Ström, J.; Tunved, P.; Redemann, J.; Thornhill, K. L.; Moore, R. H.; Lathem, T. L.; Lin, J. J.; Yoon, Y. J.
- Abstract
We examine the relationship between the number concentration of boundary-layer cloud condensation nuclei (CCN) and light extinction to investigate underlying aerosol processes and satellite-based CCN estimates. For a variety of airborne and ground-based observations not dominated by dust, regression identifies the CCN (cm-3) at 0.4 ± 0.1% supersaturation with 100.3α +1.3σ0.75 where σ (Mm-1) is the 500 nm extinction coefficient by dried particles and α is the Angstrom exponent. The deviation of 1 km horizontal average data from this approximation is typically within a factor of 2.0. ∂logCCN/∂logσ is less than unity because, among other explanations, growth processes generally make aerosols scatter more light without increasing their number. This, barring special meteorology-aerosol connections, associates a doubling of aerosol optical depth with less than a doubling of CCN, contrary to previous studies based on heavily averaged measurements or a satellite algorithm.
- Subjects
CLOUDS; CONDENSATION (Meteorology); ENVIRONMENTAL indicators; ENVIRONMENTAL impact analysis; NATURAL satellites; ATMOSPHERIC aerosols
- Publication
Atmospheric Chemistry & Physics, 2015, Vol 15, Issue 13, p7585
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-15-7585-2015