| Summary: | Atmospheric Sounding Campaign of the EUMETSAT Polar System (EPS) took place in Sodankylä, Finland from June 4 until September 5, 2007. During the three month time period we made frequent measurements of high vertical resolution temperature, water vapor and ozone profiles by balloon borne in situ instruments as the primary goal of the campaign. Water vapor and temperature measurements were timed to two overpasses per each campaign day, while ozone profiles were measured three times per week. In situ instruments were the RS92-SGP radiosondes with the new attachment method, which reduces the radiation effect on the daytime humidity measurements; the ECC ENSCI z type ozonesondes; and the cryogenic frost point hygrometers (CFH), which provide accurate measurement of water vapor in upper troposphere and lower stratosphere. In addition to the balloon borne observations, the campaign provided data from ground based continuous measurements of tropospheric water vapor and temperature profiles, cloudiness, surface weather parameters, total ozone, aerosol optical depth and total column of water vapor. The paper presents an overview of the data obtained during the campaign and the initial water vapor and ozone data comparisons to assure the quality of the acquired measurements.
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