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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sensitivities of Amazonian clouds to aerosols and updraft speed

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Author(s):
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Cecchini, Micael A. ; Machado, Luiz A. T. ; Andreae, Meinrat O. ; Martin, Scot T. ; Albrecht, Rachel I. ; Artaxo, Paulo ; Barbosa, Henrique M. J. ; Borrmann, Stephan ; Fuetterer, Daniel ; Jurkat, Tina ; Mahnke, Christoph ; Minikin, Andreas ; Molleker, Sergej ; Poehlker, Mira L. ; Poeschl, Ulrich ; Rosenfeld, Daniel ; Voigt, Christiane ; Weinzierl, Bernadett ; Wendisch, Manfred
Total Authors: 19
Document type: Journal article
Source: Atmospheric Chemistry and Physics; v. 17, n. 16, p. 10037-10050, AUG 28 2017.
Web of Science Citations: 9
Abstract

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 southern Amazon, which is highly polluted from biomass burning. 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 that 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. (AU)

FAPESP's process: 14/08615-7 - Precipitation formation processes: a study about microphysics, aerosols interactions and cloud life cycle using radar and airplane data
Grantee:Micael Amore Cecchini
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/05014-0 - GoAmazon: interactions of the urban plume of Manaus with biogenic forest emissions in Amazonia
Grantee:Paulo Eduardo Artaxo Netto
Support type: Research Program on Global Climate Change - Thematic Grants
FAPESP's process: 09/15235-8 - Cloud processes of the main precipitation systems in Brazil: a contribution to cloud resolving modeling and to the GPM (Global Precipitation Measurement)
Grantee:Luiz Augusto Toledo Machado
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/21189-7 - Amazonian cloud microphysical properties lifecycle and interactions with aerosols
Grantee:Micael Amore Cecchini
Support type: Scholarships abroad - Research Internship - Doctorate