Seasonal distributions of fine aerosol sulfate in the North American Arctic basin during TOPSE

摘要: [1] We used the mist chamber/ion chromatography technique to quantify fine aerosol SO4= (<2.7 μm) in Arctic during Tropospheric Ozone Production about Spring Equinox Experiment (TOPSE) with 2.5 min time resolution. Our effective sample area ranged from 50° 86°N and 53° 100°W. The seasonal evolution of sulfate troposphere TOPSE was consistent phenomenon haze. haze has been attributed pollution sources transported meridionally along stable isentropes into geographically broad but vertically narrow bands. These layers became more prevalent at higher altitudes as season progressed toward summer, relevant are not held so close surface. Mean particle mixing ratios February below 1000 m were elevated (112 pptv) highly variable (between 28 290 significantly lower (about 40 pptv). As progressed, variability observed altitudes, up 7 km. In May, lowest declined still remained than all altitudes. high our measurements likely reflects vertical heterogeneity wintertime atmosphere airborne sampling platform passed out these layers. It is presumed that will continue decline summer wet deposition processes become important removing troposphere.