Water and air temperatures during 1980–2010 were compared at three coastal stations of Estonia with the aim to estimate the stability conditions of the lower layers of the atmosphere. It is shown that the difference between the air and water temperatures varies during the year and the annual cycle of this variation is different at different measurement sites and also during different wind directions. Measurements at Sõrve demonstrate an unusual situation when the air-sea temperature difference is affected by the wind systems of the Gulf of Riga and Baltic Proper.
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