Description of Mixed-Phase Clouds in Weather Forecast and Climate Models

This project takes its cue from field experiments, mostly from the Arctic Summer Cloud Ocean Study (ASCOS), which was a summer expedition on the Swedish icebreaker Oden during the summer of 2008 as part of the International Polar Year, and a new expedition scheduled for the summer of 2014, also on the icebreaker Oden: the Arctic Cloud in Summer (or ACSE) experiment, which is a part of a larger effort focusing on greenhouse gas exchange in the Arctic; the SWERUS-C3 expedition. On both of this we rely on a combination of surface based in-situ observations, of for example the surface energy balance and profiles from radiosoundings, and a suite of advanced surface based remote sensing instrumentation, using Doppler radar, lidar and micro-wave radiometry. The remote sensing instruments allows for estimations of details of the clouds such as dynamics, bulk properties as well as cloud micro-physics at high resolution in time and the vertical.