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
Item
Title (Dublin Core)
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
Description (Dublin Core)
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<sup>−3</sup>) at 0.4 ± 0.1% supersaturation with 10<sup>0.3α +1.3</sup>σ<sup>0.75</sup> where σ (Mm<sup>−1</sup>) 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.
Creator (Dublin Core)
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.
Date (Dublin Core)
2018-09-07
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-15-7585-2015
https://acp.copernicus.org/articles/15/7585/2015/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
