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We present measurements of a long-range smoke transport eventrecorded on 20–21 July 2011 over Halifax, Nova Scotia, Canada,during the Quantifying the impact of BOReal forest fires onTropospheric oxidants over the Atlantic using Aircraft andSatellites (BORTAS-B) campaign.  Ground-based Fourier transformspectrometers and photometers detected air masses associated withlarge wildland fires burning in eastern Manitoba and westernOntario.  We investigate a plume with high trace gas amounts but low amountsof particles that preceded and overlapped at the Halifax site witha second plume with high trace gas loadings and significant amountsof particulate material. We show that the first plume experienceda meteorological scavenging event, but the second plume had not beensimilarly scavenged.  This points to the necessity to accountcarefully for the plume history when considering long-rangetransport since simultaneous or near-simultaneous times of arrivalare not necessarily indicative of either similar trajectories ormeteorological history.  We investigate the origin of the scavengedplume, and the possibility of an aerosol wet deposition eventoccurring in the plume ~ 24 h prior to the measurements overHalifax.  The region of lofting and scavenging is only monitored onan intermittent basis by the present observing network, and thus wemust consider many different pieces of evidence in an effort tounderstand the early dynamics of the plume.  Through this discussionwe also demonstrate the value of having many simultaneousremote-sensing measurements in order to understand the physical andchemical behaviour of biomass burning plumes

A case study of aerosol scavenging in a biomass burning plume over eastern Canada during the 2011 BORTAS field experiment