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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2016

Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation

Hamish Gordon (1) , Kamalika Sengupta (2) , Alexandru Rap (2) , Jonathan Duplissy (3) , Carla Frege (4) , Cristina Williamson (5, 6, 7) , Martin Heinritzi (5) , Martin Simon (5) , Chao Yan (8) , Joao Almeida (1, 5) , Jasmin Tröstl (4) , Tuomo Nieminen (3, 9) , Ismael K. Ortega (10, 11) , Robert Wagner (8) , Eimear M. Dunne (2, 12) , Alexey Adamov (8) , Antonio Amorim (13) , Anne-Kathrin Bernhammer (14, 15) , Federico Bianchi (4, 8) , Martin Breitenlechner (14) , Sophia Brilke (5) , Xuemeng Chen (8) , Jill S. Craven (16) , Antonio Dias (1) , Sébastian Ehrhart (1, 5) , Lukas Fischer (14) , Rchard C. Flagan (16) , Alessandro Franchin (8) , Claudia Fuchs (4) , Roberto Guida (1) , Jani Hakala (8) , Christopher R. Hoyle (4, 17) , Tuija Jokinen (8) , Heikki Junninen (8) , Juha Kangasluoma (8) , Jaeseok Kim (18, 9) , Jasper Kirkby (1, 5) , Manuel Krapf (4) , Andreas Kürten (5) , Ari Laaksonen (9, 12) , Katrianne Lehtipalo (4, 8) , Vladimir Makhmutov (19) , Serge Mathot (1) , Ugo Molteni (4) , Sarah A. Monks (6, 7) , Antti Onnela (1) , Otso Peräkylä (8) , Felix Piel (5) , Tuukka Petäjä (8) , Arnaud P. Praplan (8) , Kirsty J. Pringle (2) , Nigel A.D. Richards (2, 20) , Matti P. Rissanen (8) , Linda Rondo (5) , Nina Sarnela (8) , Siegfried Schobesberger (8) , Catherine E. Scott (2) , John H. Seinfeld (16) , Sangeeta Sharma (20) , Mikko Sipilä (3, 8) , Gerhard Steiner (8, 14, 21) , Yuri Stozhkov (19) , Frank Stratmann (21) , Antonio Tomé (13) , Annele Virtanen (9) , Alexander Lucas Vogel (1) , Andrea C. Wagner (5) , Paul E. Wagner (21) , Ernest Weingartner (4) , Daniela Wimmer (8) , Paul M. Winkler (21) , Penglin Ye (22) , Xuan Zhang (3, 8) , Armin Hansel (14, 15) , Josef Dommen (4) , Neil M. Donahue (22) , Douglas R. Worsnop (3, 9) , Urs Baltensperger (4) , Markku Kulmala (3, 8) , Joachim Curtius (5) , Kenneth S. Carslaw (1)
Hamish Gordon
  • Fonction : Auteur
Antonio Amorim
Antonio Dias
  • Fonction : Auteur
Roberto Guida
  • Fonction : Auteur
Serge Mathot
  • Fonction : Auteur
Antti Onnela
  • Fonction : Auteur
Annele Virtanen
  • Fonction : Auteur
  • PersonId : 1000405
Ernest Weingartner
  • Fonction : Auteur
  • PersonId : 850392
Josef Dommen
  • Fonction : Auteur
  • PersonId : 852366

Résumé

The magnitude of aerosol radiative forcing caused by anthropogenic emissions depends on the baseline state of the atmosphere under Q:11 pristine preindustrial conditions. Measurements in the European Organisation for Nuclear Research (CERN) CLOUD chamber show that particle formation in atmospheric conditions can occur solely from Q:12 biogenic vapors. Here, we evaluate the potential effect of this source of particles on preindustrial cloud condensation nucleus (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. Q:13 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.
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Dates et versions

hal-01471509 , version 1 (20-02-2017)

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Hamish Gordon, Kamalika Sengupta, Alexandru Rap, Jonathan Duplissy, Carla Frege, et al.. Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation. Proceedings of the National Academy of Sciences of the United States of America, 2016, ⟨10.1073/pnas.1602360113⟩. ⟨hal-01471509⟩
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