Significance of the organic aerosol driven climate feedback in the boreal area

Taina Yli-Juuti (), Tero Mielonen, Liine Heikkinen, Antti Arola, Mikael Ehn, Sini Isokääntä, Helmi-Marja Keskinen, Markku Kulmala, Anton Laakso, Antti Lipponen, Krista Luoma, Santtu Mikkonen, Tuomo Nieminen, Pauli Paasonen, Tuukka Petäjä, Sami Romakkaniemi, Juha Tonttila, Harri Kokkola and Annele Virtanen
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Taina Yli-Juuti: University of Eastern Finland
Tero Mielonen: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Liine Heikkinen: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Antti Arola: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Mikael Ehn: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Sini Isokääntä: University of Eastern Finland
Helmi-Marja Keskinen: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Markku Kulmala: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Anton Laakso: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Antti Lipponen: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Krista Luoma: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Santtu Mikkonen: University of Eastern Finland
Tuomo Nieminen: University of Eastern Finland
Pauli Paasonen: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Tuukka Petäjä: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki
Sami Romakkaniemi: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Juha Tonttila: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Harri Kokkola: Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute
Annele Virtanen: University of Eastern Finland

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Aerosol particles cool the climate by scattering solar radiation and by acting as cloud condensation nuclei. Higher temperatures resulting from increased greenhouse gas levels have been suggested to lead to increased biogenic secondary organic aerosol and cloud condensation nuclei concentrations creating a negative climate feedback mechanism. Here, we present direct observations on this feedback mechanism utilizing collocated long term aerosol chemical composition measurements and remote sensing observations on aerosol and cloud properties. Summer time organic aerosol loadings showed a clear increase with temperature, with simultaneous increase in cloud condensation nuclei concentration in a boreal forest environment. Remote sensing observations revealed a change in cloud properties with an increase in cloud reflectivity in concert with increasing organic aerosol loadings in the area. The results provide direct observational evidence on the significance of this negative climate feedback mechanism.

Date: 2021
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DOI: 10.1038/s41467-021-25850-7

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