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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-79
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Feb 2018

Research article | 16 Feb 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).

The effects of intercontinental emission sources on European air pollution levels

Jan Eiof Jonson1, Michael Schulz1, Louisa Emmons2, Johannes Flemming3, Daven Henze4, Kengo Sudo5, Marianne Tronstad Lund6, Meiyun Lin7, Anna Benedictow1, Brigitte Koffi8, Frank Dentener8, Terry Keating9, and Rigel Kivi10 Jan Eiof Jonson et al.
  • 1Norwegian Meteorological Institute, Oslo, Norway
  • 2National Center for Atmospheric Research Boulder, Colorado, USA
  • 3ECMWF (European Centre for Medium Range Forecast)
  • 4University of Colorado Boulder, Colorado, USA
  • 5NAGO YA-U,JAMSTEC,NIES, Japan
  • 6Center for International Climate and Environmental Research (CICERO) - Oslo, Norway
  • 7Program in Atmospheric and Oceanic Sciences of Princeton Univeristy and NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
  • 8European Commission, Joint Research Centre, Ispra, Italy
  • 9U.S. Environmental Protection Agency
  • 10Finnish Meteorological Institute, Helsinki, Finland

Abstract. This study is based on model results from TF HTAP (Task Force on Hemispheric Transport of Air Pollution) phase II where a set of source receptor model experiments have been defined, reducing global (and regional) anthropogenic emissions by 20% in different source regions throughout the globe, with main focus on year 2010. All the participating models use the same set of emissions. Comparisons of model results to measurements are shown for selected European surface sites and for ozone sondes, but the main focus here is on the contributions to European ozone levels from different world regions, and how and why these contributions differ depending on model. We investigate the origins by use of a novel stepwise approach combining simple tracer calculations and calculations of CO and O3. To highlight differences, we analyse the vertical transects of the mid latitude effects from the 20% emission reductions.

Based on the relative emission changes from different world regions the models agree that for ozone the contributions from the rest of the world is larger than the effects from European emissions alone, with the largest contributions from North America and East Asia. The contribution will however depend on the choice of ozone metric. There are also considerable contributions from other nearby regions to the east and from international shipping, Whereas ozone from European sources peaks in the summer months, the largest contributions from non European sources are mostly calculated for the spring months when ozone production over the polluted continents starts to increase, while at the same time the lifetime of ozone in the free troposphere is relatively long. At the surface contributions from non European sources are of similar magnitude for all European sub regions considered, defined as TF HTAP receptor regions (north west, south west, east and south east Europe).

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Focusing on Europe, this HTAP 2 study computes ozone in several global models when reducing anthropogenic emissions by 20 % in different world regions. The differences in model results are explored by use of a novel stepwise approach combining a tracer, CO and ozone. For ozone the contributions from the rest of the world are larger than from Europe, with the largest contributions from N. America and E. Asia. Contributions do however depend on the choice of ozone metric.
Focusing on Europe, this HTAP 2 study computes ozone in several global models when reducing...
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