The sources and activity of ice-nucleating particles in the high latitudes

Clouds can exist in a supercooled state down to temperatures as low as -38◦C, below which homogeneous freezing occurs. The presence of aerosol particles, known as ice nucleating particles (INPs), promotes heterogeneous freezing at warmer temperatures. These particles influence the physical and optical properties of clouds, however the role of different aerosol particles as INPs and their resulting influence on clouds is still poorly understood, especially in high latitudes regions. This project investigates the sources of particles which trigger the formation of ice in clouds in the high latitudes. Airborne and ground based measurements are used to measure the occurrence of INPs in the atmosphere and lab analysis is used to quantify the ice nucleating ability of high latitude dust samples. Samples have been collected during a field campaign in Scotland and preliminary results show significant variability in INP concentrations under different synoptic situations, which is being investigated further.

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