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FLEXPART‐WRF 7‐days backward potential emission sensitivity (PES) (a) 0–100 m PES for releases when measured O3 was below 10 ppbv and (b) 0–5,000 m PES for when O3 exceeded 30 ppbv. Monthly average fractional sea ice coverage, as represented in WRF, for April 2012 is shaded in gray. (c) The altitude (above sea level) of the air mass trajectories, up to 7 days prior to the release, for high background ozone (blue) and low background ozone (red), with RMS error bars.
