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Wind Chill in Sheep: Its Estimation from Meteorological Records by L.E Mount; D Brown is a Environmental Science article available to read on EtoBox.

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Wind chill can be calculated in two ways from the estimate of sensible (non-evaporative) heat loss (Hn) that a sheep experiences as a result of its exposure to the weather variables of air temperature (Ta), wind speed (Va), sunshine, cloud and rain. By one method, that part of the heat loss that is due to wind (Hv) is calculated; Hv varies with the fleece depth, which provides the animal with the largest part of its thermal insulation. The second method leads to an estimate of the fall in temperature under conditions of no wind (ATv) that would produce the same value of H n that occurs under the actual conditions; ATv is influenced to only a small degree by fleece depth. H v at Aberdeen (Scotland) constituted 25--30% of the annual H n in 1973. Hv persists at a high level in the summer due to the dissipation of solar heat; in the winter, Hv is associated with the enhancement of the cooling effect of low temperatures. The estimation of AT v from temperature and wind alone is compared with its estimation from the combination of all factors. ATvo per knot of meteorological wind speed (measured at 10 m height) is ~ 1 K when T a = 10 C, with an inverse variation of ~ 30% for 10 K. The ef

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Author

L.E Mount; D Brown

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0002-1571)

Published

1983

Language

EN

Field

Environmental Science (Physical Sciences)