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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-694
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Jul 2018

Research article | 23 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Direct effect of aerosols on solar radiation and gross primary production in boreal and hemiboreal forests

Ekaterina Ezhova1, Ilona Ylivinkka1, Joel Kuusk2, Kaupo Komsaare3, Marko Vana3, Alisa Krasnova4, Steffen Noe4, Mikhail Arshinov5, Boris Belan5, Sung-Bin Park6, Jošt Valentin Lavric6, Martin Heimann1,6, Tuukka Petäjä1, Timo Vesala1,7, Ivan Mammarella1, Pasi Kolari1, Jaana Bäck7, Ullar Rannik1, Veli-Matti Kerminen1, and Markku Kulmala1 Ekaterina Ezhova et al.
  • 1Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
  • 2Tartu Observatory, Faculty of Science and Technology, University of Tartu, Tõravere, Nõo parish, 61602 Tartu county, Estonia
  • 3Institute of Physics, Faculty of Science and Technology, University of Tartu, 50411, Tartu, Estonia
  • 4Department of Plant Physiology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, EE-51006 Tartu, Estonia
  • 5V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia
  • 6Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany
  • 7Institute for Atmospheric and Earth System Research / Forest Sciences, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland

Abstract. The effect of an aerosol loading on solar radiation and further on photosynthesis is a relevant question for estimating climate feedback mechanisms. This effect is quantified in the present study using ground-based measurements from five remote sites in boreal and hemiboreal (coniferous and mixed) forests of Eurasia. The diffuse fraction of global radiation associated with the direct effect of aerosols, that is excluding the effect of clouds, increases with an increasing aerosol loading. The increase in the diffuse fraction of global radiation from approximately 0.11 on the days characterized by low aerosol loading up to 0.2–0.27 pertaining to relatively high aerosol loading leads to the increase in gross primary production (GPP) at all sites by 6–14%. The largest increase in GPP (relative to the days with low aerosol loading) is observed for two types of ecosystems: a coniferous forest at the high latitudes and a mixed forest at the middle latitudes. For the former ecosystem the change in GPP due to relatively large increase in the diffuse radiation is compensated by the moderate increase in the light use efficiency. For 10 the latter ecosystem, the increase in diffuse radiation is smaller for the same aerosol loading, but the smaller change in GPP due to this relationship between radiation and aerosol loading is compensated by the higher increase in the light use efficiency. The dependency of GPP on the diffuse fraction of solar radiation has a weakly pronounced maximum related to clouds.

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Understanding of connections between aerosol, solar radiation and photosynthesis of terrestrial ecosystems is important for the estimates of the carbon dioxide balance in the atmosphere. Atmospheric aerosol and clouds influence solar radiation. In this study, we quantify aerosol effect on solar radiation in boreal forests and study forest ecosystems response to this change in radiation conditions. The analysis is based on atmospheric observations from several remote stations in Eurasian forests.
Understanding of connections between aerosol, solar radiation and photosynthesis of terrestrial...
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