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The ice phase in clouds contributes largely to uncertainties in globalclimate models partly due to a lack of atmospheric observations. At moderatesupercooling ice nucleating particles (INP) and ice particles (IP) are presentin small concentrations and a large volume of air is necessary for observation.Here, we report on initial observations of IP in supercooled fog with a newsetup. We use a 0.3 m wide, vertical curtain of light and a camera pointingperpendicularly at it to record light scattered by IP formed in radiation fognear the ground at temperatures between -3 {\deg}C and -9 {\deg}C. Depositionrates of IP were several times larger than expected from number concentrationsof INP found on $PM_{10}$-filters at a nearby air quality monitoring station.The discrepancy might be explained by secondary ice formation through thefragmentation of freezing water droplets, the entrainment of INP from above thefog layer through settling, the loss or deactivation of INP on$PM_{10}$-filters prior to analysis, or radiative cooling of INP below thetemperature of the surrounding air. In summary, radiation fog constitutes aneasily accessible form of a supercooled cloud, in which observations can bemade for long enough to quantify the deposition rate of rare IP produced in anatural environment.

Supercooled fog as a natural laboratory for studying ice formation in clouds