The Arctic Summer Cloud Ocean Study (ASCOS) was a scientific expedition to the high Arctic in summer 2008, during the International Polar Year (IPY), which was deployed on the Swedish icebreaker Oden. The main target was to study the formation and life cycle of low-altitude Arctic clouds in the central Arctic. The expedition was by necessity highly interdisciplinary and covered observations of the physics and chemistry of the atmosphere and the upper ocean, meteorology, cloud microphysics and aerosols, and upper-ocean biogeochemistry. ASCOS was likely the largest single Arctic Ocean atmospheric effort during the IPY an was endorsed under the AICI-IPY umbrella under SOLAS.
A collection of 27 datasets from the expedition is available here. The data can be accessed at a thematic data presentation where they are divided in 16 categories. The button ”Visit web site” above links there. The data can alternatively be accessed through the 27 metadata descriptions listed below. Both ways provide the same data.