ASCOS tethersonde

ASCOS was an interdisciplinary expedition to the central Arctic on the icebreaker Oden from 1 August to 9 September 2008. The expedition focused on processes relating to cloud formation in the summer Arctic and included observations of marine biology and chemistry, atmospheric chemistry, physical oceanography, aerosol chemistry and physics, and meteorology. A tethered balloon with meteorological instrument package operated on a near-continuous basis, profiling from the surface up to approximatly 700m. Measurements were made of wind(mean and turbulent), temperature, relative humidity, and on some occasions aerosol size spectra (16 channels, 0.25<D<18.5 um). Motion sensors recorded at 10Hz allow motion correction of turbulent winds measured with sonic anemometer.