Meteorological term for a directed, stronger air movement in the earth's atmosphere as one of the many factors of the weather or in the long-term weather pattern of the climate. Strong air movements can have both positive and negative effects in the vineyard. Hot, dry winds, such as in Australia, or the scirocco blowing from the Sahara towards the Mediterranean and reaching southern European wine-growing areas can be dangerous. Likewise, cold winds in valleys, such as the downdraft Mistral on the southern Rhône, can be desirable or feared. In the case of high exposure, the vines can also experience wind stress, which results in lower yields, impaired growth of shoots, leaf area and grapes. As protection against the wind, the stomata in the leaves are closed by the vines, which results in limited photosynthesis and thus later grape ripening.
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Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)