Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-7781-2009 http://www.atmos-chem-phys-discuss.net/9/7781/2009/ http://www.atmos-chem-phys-discuss.net/9/7781/2009/acpd-9-7781-2009.html http://www.atmos-chem-phys-discuss.net/9/7781/2009/acpd-9-7781-2009.pdf 7781 7823 2009-03-24 Physical properties of High Arctic tropospheric particles during winter L. Bourdages T. J. Duck tom.duck@dal.ca G. Lesins J. R. Drummond E. W. Eloranta Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada Space Science and Engineering Center, University of Wisconsin, Madison, USA A climatology of particle properties in the wintertime High Arctic troposphere is constructed using measurements from a lidar and cloud radar located at Eureka, Nunavut Territory (80° N, 86° W). Four different particle groupings are considered: aerosols, mixed-phase clouds, ice clouds and boundary-layer ice crystals. Two-dimensional histograms of occurrence probabilities against depolarization and radar/lidar colour ratio, as well as their vertical distributions, are presented. The largest ice crystals originate from mixed-phase clouds, whereas the smallest are topographic blowing snow residuals in the boundary layer. Ice cloud crystals have depolarization and size decreasing with height. The depolarization trend is associated with the large ice crystal sub-population. Small crystals depolarize more than large ones in ice clouds at a given altitude, and show constant modal depolarization with height. Ice clouds in the mid-troposphere are sometimes observed to precipitate to the ground. Water clouds are constrained to the lower troposphere and are associated with the surface inversion layer depth. Aerosols are most abundant near the ground and are frequently mixed with the other particle types. 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