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Volume 18, issue 12
Atmos. Chem. Phys., 18, 8829-8848, 2018
https://doi.org/10.5194/acp-18-8829-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 18, 8829-8848, 2018
https://doi.org/10.5194/acp-18-8829-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Jun 2018

Research article | 22 Jun 2018

Radiative impact of an extreme Arctic biomass-burning event

Justyna Lisok1, Anna Rozwadowska2, Jesper G. Pedersen1, Krzysztof M. Markowicz1, Christoph Ritter3, Jacek W. Kaminski4, Joanna Struzewska5, Mauro Mazzola6, Roberto Udisti6,7, Silvia Becagli7, and Izabela Gorecka8 Justyna Lisok et al.
  • 1Institute of Geophysics, Faculty of Physics, University of Warsaw, Warsaw, Poland
  • 2Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland
  • 3Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany
  • 4Department of Atmospheric Physics, Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
  • 5Faculty of Building Services Hydro and Environmental Engineering, Warsaw University of Technology, Warsaw, Poland
  • 6National Research Council, Institute of Atmospheric Sciences and Climate, Bologna, Italy
  • 7Department of Chemistry, University of Florence, Florence, Italy
  • 8Geoterra, Gdansk, Poland

Abstract. The aim of the presented study was to investigate the impact on the radiation budget of a biomass-burning plume, transported from Alaska to the High Arctic region of Ny-Ålesund, Svalbard, in early July 2015. Since the mean aerosol optical depth increased by the factor of 10 above the average summer background values, this large aerosol load event is considered particularly exceptional in the last 25 years. In situ data with hygroscopic growth equations, as well as remote sensing measurements as inputs to radiative transfer models, were used, in order to estimate biases associated with (i) hygroscopicity, (ii) variability of single-scattering albedo profiles, and (iii) plane-parallel closure of the modelled atmosphere. A chemical weather model with satellite-derived biomass-burning emissions was applied to interpret the transport and transformation pathways.

The provided MODTRAN radiative transfer model (RTM) simulations for the smoke event (14:00 9 July–11:30 11 July) resulted in a mean aerosol direct radiative forcing at the levels of −78.9 and −47.0Wm−2 at the surface and at the top of the atmosphere, respectively, for the mean value of aerosol optical depth equal to 0.64 at 550nm. This corresponded to the average clear-sky direct radiative forcing of −43.3Wm−2, estimated by radiometer and model simulations at the surface. Ultimately, uncertainty associated with the plane-parallel atmosphere approximation altered results by about 2Wm−2. Furthermore, model-derived aerosol direct radiative forcing efficiency reached on average −126Wm−2τ550 and −71Wm−2τ550 at the surface and at the top of the atmosphere, respectively. The heating rate, estimated at up to 1.8Kday−1 inside the biomass-burning plume, implied vertical mixing with turbulent kinetic energy of 0.3m2s−2.

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The aim of the presented study was to investigate the impact on the radiation budget and atmospheric dynamics of a biomass-burning plume, transported from Alaska to the High Arctic region of Ny-Ålesund, Svalbard, in early July 2015. We found that the smoke plume may significantly alter radiative properties of the atmosphere. Furthermore, the simulations of atmospheric dynamics indicated a vertical positive displacement and broadening of the plume with time.
The aim of the presented study was to investigate the impact on the radiation budget and...
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