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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 22 | Copyright
Atmos. Chem. Phys., 17, 13699-13719, 2017
https://doi.org/10.5194/acp-17-13699-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Nov 2017

Research article | 17 Nov 2017

Future inhibition of ecosystem productivity by increasing wildfire pollution over boreal North America

Xu Yue1,2, Susanna Strada3, Nadine Unger4, and Aihui Wang2 Xu Yue et al.
  • 1Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 3Laboratoire des Sciences du Climat et de l'Environnement, L'Orme des Merisiers – Bat 712, 91191 Gif-Sur-Yvette, France
  • 4College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QE, UK

Abstract. Biomass burning is an important source of tropospheric ozone (O3) and aerosols. These air pollutants can affect vegetation photosynthesis through stomatal uptake (for O3) and light scattering and absorption (for aerosols). Wildfire area burned is projected to increase significantly in boreal North America by the mid-century, while little is known about the impacts of enhanced emissions on the terrestrial carbon budget. Here, combining site-level and satellite observations and a carbon–chemistry–climate model, we estimate the impacts of fire emitted O3 and aerosols on net primary productivity (NPP) over boreal North America. Fire emissions are calculated based on an ensemble projection from 13 climate models. In the present day, wildfire enhances surface O3 by 2ppbv (7%) and aerosol optical depth (AOD) at 550nm by 0.03 (26%) in the summer. By mid-century, area burned is predicted to increase by 66% in boreal North America, contributing more O3 (13%) and aerosols (37%). Fire O3 causes negligible impacts on NPP because ambient O3 concentration (with fire contributions) is below the damage threshold of 40ppbv for 90% summer days. Fire aerosols reduce surface solar radiation but enhance atmospheric absorption, resulting in enhanced air stability and intensified regional drought. The domain of this drying is confined to the north in the present day but extends southward by 2050 due to increased fire emissions. Consequently, wildfire aerosols enhance NPP by 72TgCyr−1 in the present day but decrease NPP by 118TgCyr−1 in the future, mainly because of the soil moisture perturbations. Our results suggest that future wildfire may accelerate boreal carbon loss, not only through direct emissions increasing from 68TgCyr−1 at present day to 130TgCyr−1 by mid-century but also through the biophysical impacts of fire aerosols.

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Climate change will significantly increase wildfire emissions in boreal North America by the midcentury, leading to increased surface ozone and atmospheric aerosols. These air pollutants can affect vegetation photosynthesis through stomatal uptake (for ozone) and radiative and climatic perturbations (for aerosols). Using a carbon–chemistry–climate model, we estimate trivial ozone vegetation damages but significant aerosol-induced reduction in ecosystem productivity by the 2050s.
Climate change will significantly increase wildfire emissions in boreal North America by the...
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