 |
| Titel |
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 |
| VerfasserIn |
Y. Shinozuka, A. D. Clarke, A. Nenes, A. Jefferson, R. Wood, C. S. McNaughton, J. Ström, P. Tunved, J. Redemann, K. L. Thornhill, R. H. Moore, T. L. Lathem, J. J. Lin, Y. J. Yoon |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 13 ; Nr. 15, no. 13 (2015-07-13), S.7585-7604 |
| Datensatznummer |
250119890
|
| Publikation (Nr.) |
 copernicus.org/acp-15-7585-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|