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Biogenic Potassium Salt Particles as Seeds for Secondary Organic Aerosol in the Amazon

Pöhlker, Christopher and Wiedemann, Kenia T. and Sinha, Bärbel and Shiraiwa, Manabu and Gunthe, Sachin S. and Smith, Mackenzie and Su, Hang and Artaxo, Paulo and Chen, Qi and Cheng, Yafang and Elbert, Wolfgang and Gilles, Mary K. and Kilcoyne, Arthur L. D. and Moffet, Ryan C. and Weigand, Markus and Martin, Scot T. and Pöschl, Ulrich and Andreae, Meinrat O. (2012) Biogenic Potassium Salt Particles as Seeds for Secondary Organic Aerosol in the Amazon. Science, 337 (6098). pp. 1075-1078. ISSN 0036-8075.

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The fine particles serving as cloud condensation nuclei in pristine Amazonian rainforest air consist mostly of secondary organic aerosol. Their origin is enigmatic, however, because new particle formation in the atmosphere is not observed. Here, we show that the growth of organic aerosol particles can be initiated by potassium-salt–rich particles emitted by biota in the rainforest. These particles act as seeds for the condensation of low- or semi-volatile organic compounds from the atmospheric gas phase or multiphase oxidation of isoprene and terpenes. Our findings suggest that the primary emission of biogenic salt particles directly influences the number concentration of cloud condensation nuclei and affects the microphysics of cloud formation and precipitation over the rainforest.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Shiraiwa, Manabu0000-0003-2532-5373
Smith, Mackenzie0000-0002-3321-1432
Chen, Qi0000-0001-6353-9589
Andreae, Meinrat O.0000-0003-1968-7925
Additional Information:© 2012 American Association for the Advancement of Science. Received for publication 12 April 2012; accepted for publication 23 July 2012. This work has been supported by the Max Planck Society, the Max Planck Graduate Center, the Geocycles Cluster Mainz (Landesexzellenzcluster Rheinland-Pfalz), and the European Community (PEGASOS, FP7-265148). The Harvard Environmental Chamber was supported by the Office of Science, Office of Basic Energy Sciences (BES), U.S. Department of Energy (DOE), grant no. DE-FG02-08ER6452, and the U.S. NSF under grant no. 0925467. The Advanced Light Source is supported by the Director, Office of Science, BES, of the U.S. DOE under contract no. DE-AC02-05CH11231. We thank the Helmholtz-Zentrum Berlin for the allocation of synchrotron radiation beamtime at BESSY II. We thank the Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, and the ATTO team under the Brazilian coordinator, A. O. Manzi, for their collaboration and field support. We also thank G. R. Carmichael and the Center for Global and Regional Environmental Research at the University of Iowa for support in the Weather Research and Forecasting (WRF) model simulations. We gratefully acknowledge R. Ditz, I. Trebs, X. Chi, J. A. Huffman, J. Kesselmeier, J. Schöngart, M. Kuwata, T. Tyliszczak, J. Huth, G. Schütz, E. Goering, M. Bechtel, J.-D. Förster, and T. Behrendt for support and helpful discussions.
Funding AgencyGrant Number
Max Planck SocietyUNSPECIFIED
Max Planck Graduate CenterUNSPECIFIED
Geocycles Cluster MainzUNSPECIFIED
European CommunityPEGASOS
European CommunityFP7-265148
Department of Energy (DOE)DE-FG02-08ER6452
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:6098
Record Number:CaltechAUTHORS:20120913-113355481
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34067
Deposited By: Jason Perez
Deposited On:13 Sep 2012 19:06
Last Modified:09 Mar 2020 13:19

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