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  Cloud albedo increase from carbonaceous aerosol

Leaitch, W. R., Lohmann, U., Russell, L. M., Garrett, T., Shantz, N. C., Toom-Sauntry, D., et al. (2010). Cloud albedo increase from carbonaceous aerosol. Atmospheric Chemistry and Physics, 10(16), 7669-7684. doi:10.5194/acp-10-7669-2010.

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http://dx.doi.org/10.5194/acp-10-7669-2010 (Verlagsversion)
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 Urheber:
Leaitch, W. R., Autor
Lohmann, U., Autor
Russell, L. M., Autor
Garrett, T., Autor
Shantz, N. C., Autor
Toom-Sauntry, D., Autor
Strapp, J. W., Autor
Hayden, K. L., Autor
Marshall, J.1, Autor           
Wolde, M., Autor
Worsnop, D. R., Autor
Jayne, J. T., Autor
Affiliations:
1Satellite-based Remote Sensing of Greenhouse Gases, Dr. J. Marshall, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497789              

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Schlagwörter: mass accommodation coefficient condensation-nuclei number concentrations atmospheric aerosols stratocumulus clouds hygroscopic growth microphysics model droplet activation organic aerosols rural site
 Zusammenfassung: Airborne measurements from two consecutive days, analysed with the aid of an aerosol-adiabatic cloud parcel model, are used to study the effect of carbonaceous aerosol particles on the reflectivity of sunlight by water clouds. The measurements, including aerosol chemistry, aerosol microphysics, cloud microphysics, cloud gust velocities and cloud light extinction, were made below, in and above stratocumulus over the northwest Atlantic Ocean. On the first day, the history of the below-cloud fine particle aerosol was marine and the fine particle sulphate and organic carbon mass concentrations measured at cloud base were 2.4 mu g m(-3) and 0.9 mu g m(-3) respectively. On the second day, the below-cloud aerosol was continentally influenced and the fine particle sulphate and organic carbon mass concentrations were 2.3 mu g m(-3) and 2.6 mu g m(-3) respectively. Over the range 0.06-0.8 mu m diameter, the shapes of the below-cloud size distributions were similar on both days and the number concentrations were approximately a factor of two higher on the second day. The cloud droplet number concentrations (CDNC) on the second day were approximately three times higher than the CDNC measured on the first day. Using the parcel model to separate the influence of the differences in gust velocities, we estimate from the vertically integrated cloud light scattering measurements a 6% increase in the cloud albedo principally due to the increase in the carbonaceous components on the second day. Assuming no additional absorption by this aerosol, a 6% albedo increase translates to a local daytime radiative cooling of similar to 12 W m(-2). This result provides observational evidence that the role of anthropogenic carbonaceous components in the cloud albedo effect can be much larger than that of anthropogenic sulphate, as some global simulations have indicated.

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Sprache(n): eng - English
 Datum: 2010
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.5194/acp-10-7669-2010
ISI: ://000281432800010
Anderer: BGC1370
 Art des Abschluß: -

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Titel: Atmospheric Chemistry and Physics
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geosciences Union
Seiten: - Band / Heft: 10 (16) Artikelnummer: - Start- / Endseite: 7669 - 7684 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016
ISSN: 1680-7316