Optical Properties of the Urban Aerosol Particles Obtained from Ground Based Measurements and Satellite-Based Modelling Studies

Figure 6

(a) Air parcel trajectory analysis from the National Oceanic and Atmospheric Administration (NOAA) Air Resources Laboratory (ARL) HYSPLIT model. For this analysis, the model was run backwards for 96 hours from 3 July 2012 at 00 UTC. Traces show the origin of air parcels at Vilnius at the 500 m (red), 1500 m (blue), and 2500 m (green) levels. (b) The variation of the measured and hourly averaged values of the light scattering coefficient at 550 nm and the particle number concentration. (c) The Ångström exponent for 450 and 700 nm wavelength pair. (d) The particle size distributions.

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