Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation

Autor(en)

Hamish Gordon, Kamalika Sengupta, Alexandru Rap, Jonathan Duplissy, Carla Frege, Christina Williamson, Martin Heinritzi, Mario Simon, Chao Yan, Joao Almeida, Jasmin Tröstl, Tuomo Nieminen, Ismael K. Ortega, Robert Wagner, Eimear M. Dunne, Alexey Adamov, Antonio Amorim, Anne-Kathrin Bernhammer, Federico Bianchi, Martin Breitenlechner, Sophia Brilke, Xuemeng Chen, Jill S. Craven, Antonio Dias, Sebastian Ehrhart, Lukas Fischer, Richard C. Flagan, Alessandro Franchin, Claudia Fuchs, Roberto Guida, Jani Hakala, Christopher R. Hoyle, Tuija Jokinen, Heikki Junninen, Juha Kangasluoma, Jaeseok Kim, Jasper Kirkby, Manuel Krapf, Andreas Kürten, Ari Laaksonen, Katrianne Lehtipalo, Vladimir Makhmutov, Serge Mathot, Ugo Molteni, Sarah A. Monks, Antti Onnela, Otso Peräkylä, Felix Piel, Tuukka Petäjä, Arnaud P. Praplan, Kirsty J. Pringle, Nigel A. D. Richards, Matti P. Rissanen, Linda Rondo, Nina Sarnela, Siegfried Schobesberger, Catherine E. Scott, John H. Seinfeld, Sangeeta Sharma, Mikko Sipilä, Gerhard Steiner, Yuri Stozhkov, Frank Stratmann, Antonio Tome, Annele Virtanen, Alexander Lucas Vogel, Andrea C. Wagner, Paul E. Wagner, Ernest Weingartner, Daniela Wimmer, Paul M. Winkler, Penglin Ye, Xuan Zhang, Armin Hansel, Josef Dommen, Neil M. Donahue, Douglas R. Worsnop, Urs Baltensperger, Markku Kulmala, Joachim Curtius, Kenneth S. Carslaw

Abstrakt

The magnitude of aerosol radiative forcing caused by anthropogenic emissions depends on the baseline state of the atmosphere under pristine preindustrial conditions. Measurements show that particle formation in atmospheric conditions can occur solely from biogenic vapors. Here, we evaluate the potential effect of this source of particles on preindustrial cloud condensation nuclei (CCN) concentrations and aerosol-cloud radiative forcing over the industrial period. Model simulations show that the pure biogenic particle formation mechanism has a much larger relative effect on CCN concentrations in the preindustrial atmosphere than in the present atmosphere because of the lower aerosol concentrations. Consequently, preindustrial cloud albedo is increased more than under present day conditions, and therefore the cooling forcing of anthropogenic aerosols is reduced. The mechanism increases CCN concentrations by 20-100% over a large fraction of the preindustrial lower atmosphere, and the magnitude of annual global mean radiative forcing caused by changes of cloud albedo since 1750 is reduced by 0.22 W m(-2) (27%) to -0.60 W m(-2). Model uncertainties, relatively slow formation rates, and limited available ambient measurements make it difficult to establish the significance of a mechanism that has its dominant effect under preindustrial conditions. Our simulations predict more particle formation in the Amazon than is observed. However, the first observation of pure organic nucleation has now been reported for the free troposphere. Given the potentially significant effect on anthropogenic forcing, effort should be made to better understand such naturally driven aerosol processes.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

European Organization for Nuclear Research (CERN), University of Leeds, University of Helsinki, Paul Scherrer Institute, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Colorado, Boulder, National Oceanic and Atmospheric Administration, University of Eastern Finland, Université Lille I - Sciences et Technologies, ONERA-The French Aerospac Lab., Finnish Meteorological Institute, Universidade de Lisboa, Universidade da Beira Interior, Leopold-Franzens-Universität Innsbruck, IONICON Analytik GmbH, California Institute of Technology (Caltech), Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft, Korea Institute of Ocean Science & Technology (KIOST), Russian Academy of Sciences, Carnegie Mellon University, Aerodyne Res Inc, Leibniz-Institut für Troposphärenforschung

Journal

Proceedings of the National Academy of Sciences of the United States of America (PNAS)

Band

113

Seiten

12053-12058

Anzahl der Seiten

6

ISSN

0027-8424

DOI

https://doi.org/10.1073/pnas.1602360113

Publikationsdatum

10-2016

Peer-reviewed

Ja

ÖFOS 2012

103037 Umweltphysik, 103039 Aerosolphysik

Schlagwörter

ASJC Scopus Sachgebiete

General

Sustainable Development Goals

SDG 13 – Maßnahmen zum Klimaschutz

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b217ecd1-1cf6-4aca-8cbf-e506d693890a