A study on radiative and microphysical properties of mixed-phase clouds in the arctic

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In order to investigate the relationship between radiative and microphysical properties of mixed-phase clouds in the lower troposphere of the arctic, we have performed an intensive observation at the Norwegian Zeppelin Observatory(474 m above m. s. l.) in Ny-Alesund, Svalbard. Typical mixed-phase clouds appeared on 9 June 2011, and were measured by cloud microphysics probes installed at the observatory. In-situ measurements showed a bi-modal size distribution of cloud particles ; water droplets with radii around 15μm and ice-dominant mixed-phase particles with equivalent radii around 100μm. Thus the result has suggested that the cloud albedo effect is dominated by water droplets and the contribution of ice particles is rather important in the cloud-atmosphere heat balance process.