Journal article

Pollution transport from North America to Greenland during summer 2008

Thomas J, Raut J, Law K, Marelle L, Ancellet G, Ravetta F, Fast J, Pfister G, Emmons L, Diskin G, Weinheimer A, Roiger A, Schlager H ...see all

Atmospheric Chemistry and Physics, vol. 13, issue 7 (2013) pp. 3825-3848 Published by Copernicus GmbH

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Ozone pollution transported to the Arctic is a significant concern
because of the rapid, enhanced warming in high northern latitudes, which
is caused, in part, by short-lived climate forcers, such as ozone.
Long-range transport of pollution contributes to background and episodic
ozone levels in the Arctic. However, the extent to which plumes are
photochemically active during transport, particularly during the summer,
is still uncertain. In this study, regional chemical transport model
simulations are used to examine photochemical production of ozone in air
masses originating from boreal fire and anthropogenic emissions over
North America and during their transport toward the Arctic during early
July 2008. Model results are evaluated using POLARCAT aircraft data
collected over boreal fire source regions in Canada (ARCTAS-B) and
several days downwind over Greenland (POLARCAT-France and
POLARCAT-GRACE). Model results are generally in good agreement with the
observations, except for certain trace gas species over boreal fire
regions, in some cases indicating that the fire emissions are too low.
Anthropogenic and biomass burning pollution (BB) from North America was
rapidly uplifted during transport east and north to Greenland where
pollution plumes were observed in the mid-and upper troposphere during
POLARCAT. A model sensitivity study shows that CO levels are in better
agreement with POLARCAT measurements (fresh and aged fire plumes) upon
doubling CO emissions from fires. Analysis of model results, using Delta
O-3/Delta CO enhancement ratios, shows that pollution plumes formed
ozone during transport towards the Arctic. Fresh anthropogenic plumes
have average Delta O-3/Delta CO enhancement ratios of 0.63 increasing to
0.92 for aged anthropogenic plumes, indicating additional ozone
production during aging. Fresh fire plumes are only slightly enhanced in
ozone (Delta O-3/Delta CO=0.08), but form ozone downwind with Delta
O-3/Delta CO of 0.49 for aged BB plumes (model-based run). We estimate
that aged anthropogenic and BB pollution together made an important
contribution to ozone levels with an average contribution for latitudes
> 55 degrees N of up to 6.5 ppbv (18%) from anthropogenic pollution and
3 ppbv (5.2%) from fire pollution in the model domain in summer 2008.

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  • J. L. Thomas

  • J. C. Raut

  • K. S. Law

  • L. Marelle

  • G. Ancellet

  • F. Ravetta

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