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  Sensitivities of Amazonian clouds to aerosols and updraft speed

Cecchini, M. A., Machado, L. A. T., Andreae, M. O., Martin, S. T., Albrecht, R. I., Artaxo, P., et al. (2017). Sensitivities of Amazonian clouds to aerosols and updraft speed. Atmospheric Chemistry and Physics Discussions, 17.

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Cecchini, Micael A., Autor
Machado, Luiz A. T., Autor
Andreae, M. O.1, Autor           
Martin, Scot T., Autor
Albrecht, Rachel I., Autor
Artaxo, Paulo, Autor
Barbosa, Henrique M. J., Autor
Borrmann, S.2, Autor           
Fütterer, Daniel, Autor
Jurkat, Tina, Autor
Mahnke, Christoph2, Autor           
Minikin, Andreas, Autor
Molleker, S.2, Autor           
Pöhlker, M. L.3, Autor           
Pöschl, U.3, Autor           
Rosenfeld, Daniel, Autor
Voigt, Christiane, Autor
Weinzierl, Bernadett, Autor
Wendisch, Manfred, Autor
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              
3Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Zusammenfassung: The effects of aerosol particles and updraft speed on warm-phase cloud microphysical properties are studied in the Amazon region as part of the ACRIDICON-CHUVA experiment. Here we expand the sensitivity analysis usually found in the literature by concomitantly considering cloud evolution, putting the sensitivity quantifications into perspective in relation to in-cloud processing, and by considering the effects on droplet size distribution (DSD) shape. Our in-situ aircraft measurements over the Amazon basin cover a wide range of particle concentration and thermodynamic conditions, from the pristine regions over coastal and forested areas to the highly biomass-burning-polluted southern Amazon. The quantitative results show that particle concentration is the primary driver for the vertical profiles of effective diameter and droplet concentration in the warm phase of Amazonian convective clouds, while updraft speeds have a modulating role in the latter and in total condensed water. The cloud microphysical properties were found to be highly variable with altitude above cloud base, which we used as a proxy for cloud evolution since it is a measure of the time droplets were subject to cloud processing. We show that DSD shape is crucial in understanding cloud sensitivities. The aerosol effect on DSD shape was found to vary with altitude, which can help models to better constrain the indirect aerosol effect on climate.

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Sprache(n): eng - English
 Datum: 2017
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.5194/acp-2017-89
 Art des Abschluß: -

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Titel: Atmospheric Chemistry and Physics Discussions
  Kurztitel : Atmos. Chem. Phys. Discuss.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geophysical Society, Copernicus Publ.
Seiten: 23 Band / Heft: 17 Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 1680-7367
CoNE: https://pure.mpg.de/cone/journals/resource/111076360006006