Abstract
The aim of the paper is to get an overview of the wind climatology in the free atmosphere above Estonia, i.e., in the middle of the Baltic Sea catchment area. Aerological soundings have been carried out at Tallinn Aerological Station since 1953. From the recorded data, daily values of wind direction and speed on the 500 hPa isobaric level have been chosen for analysis. Zonal and meridional components of wind velocity have been calculated and their average seasonal variations described. The zonal component is the largest in autumn and the weakest in summer, the meridional component is positive from April to August and negative from September to March. Separate analysis of changes in the wind speed and direction permits to establish that these changes are mostly due to changes in the wind direction. From the time series analysis, trends in the wind velocity components during the period of 1953–1992 have been estimated for different months. The analysis shows an increase in the meridional component in March and an increase in the zonal component in winter.
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