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  African volcanic emissions influencing atmospheric aerosols over the Amazon rain forest

Saturno, J., Ditas, F., Penning de Vries, M., Holanda, B. A., Pöhlker, M. L., Carbone, S., et al. (2018). African volcanic emissions influencing atmospheric aerosols over the Amazon rain forest. Atmospheric Chemistry and Physics, 18(14), 10391-10405. doi:10.5194/acp-18-10391-2018.

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Saturno, Jorge1, Author              
Ditas, Florian1, Author              
Penning de Vries, M.2, Author              
Holanda, Bruna A.1, Author              
Pöhlker, Mira L.1, Author              
Carbone, Samara3, Author
Walter, David3, Author
Bobrowski, Nicole3, Author
Brito, Joel3, Author
Chi, Xuguang3, Author
Gutmann, Alexandra3, Author
Hrabe de Angelis, Isabella4, Author              
Machado, Luiz A. T.3, Author
Moran-Zuloaga, Daniel1, Author              
Ruediger, Julian3, Author
Schneider, Johannes5, Author              
Schulz, Christiane5, Author              
Wang, Qiaoqiao3, Author
Wendisch, Manfred3, Author
Artaxo, Paulo3, Author
Wagner, Thomas2, Author              Pöschl, Ulrich1, Author              Andreae, Meinrat O.1, Author              Pöhlker, Christopher1, Author               more..
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2Satellite Remote Sensing, Max Planck Institute for Chemistry, Max Planck Society, ou_1826293              
3external, ou_persistent22              
4Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              
5Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              

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 Abstract: The long-range transport (LRT) of trace gases and aerosol particles plays an important role for the composition of the Amazonian rain forest atmosphere. Sulfate aerosols originate to a substantial extent from LRT sources and play an important role in the Amazonian atmosphere as strongly light-scattering particles and effective cloud condensation nuclei. The transatlantic transport of volcanic sulfur emissions from Africa has been considered as a source of particulate sulfate in the Amazon; however, direct observations have been lacking so far. This study provides observational evidence for the influence of emissions from the Nyamuragira–Nyiragongo volcanoes in Africa on Amazonian aerosol properties and atmospheric composition during September 2014. Comprehensive ground-based and airborne aerosol measurements together with satellite observations are used to investigate the volcanic event. Under the volcanic influence, hourly mean sulfate mass concentrations in the submicron size range reached up to 3.6 µg m−3 at the Amazon Tall Tower Observatory, the highest value ever reported in the Amazon region. The substantial sulfate injection increased the aerosol hygroscopicity with κ values up to 0.36, thus altering aerosol–cloud interactions over the rain forest. Airborne measurements and satellite data indicate that the transatlantic transport of volcanogenic aerosols occurred in two major volcanic plumes with a sulfate-enhanced layer between 4 and 5 km of altitude. This study demonstrates how African aerosol sources, such as volcanic sulfur emissions, can substantially affect the aerosol cycling and atmospheric processes in Amazonia.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000439427800001
DOI: 10.5194/acp-18-10391-2018
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Title: Atmospheric Chemistry and Physics
  Abbreviation : ACP
Source Genre: Journal
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Publ. Info: Göttingen : Copernicus Publications
Pages: - Volume / Issue: 18 (14) Sequence Number: - Start / End Page: 10391 - 10405 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016