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Wind structure near the ground and its relation to temperature gradient
Author(s) -
Heywood G. S. P.
Publication year - 1931
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49705724208
Subject(s) - wind gradient , temperature gradient , anemometer , wind speed , diurnal temperature variation , thermal wind , variation (astronomy) , wind direction , atmospheric sciences , meteorology , turbulence , apparent temperature , wind profile power law , environmental science , geology , physics , humidity , astrophysics
The wind velocities given in this paper were obtained by two anemometers at heights of 12·7 m. and 94·5 m. above the ground. Though the diurnal variation of wind velocity at different heights, has been worked out by numerous observers, there are not many results from anemometers as high as 95 m.; for this reason the ordinary diurnal variation at this height in summer and winter is given below, together with that at 13 m. for comparison. The diurnal variation at the two heights in strong, moderate and light winds is then considered, somewhat on the lines of Hell‐mann's paper. 1 The vertical gradient of temperature up to 87 m. is also. recorded. Wind gradient must depend largely on temperature gradient, and in the next part of the paper the relation between the difference in wind velocity and the difference in temperature over approximately the same height interval, is worked out for various wind strengths. The various factors controlling the wind gradient are investigated, and the results are found to agree with Taylor's, theory of turbulence. 2 The gustiness of the wind is also studied in its relation to vertical temperature gradient and to wind direction. Finally some individual charts, illustrating the various points, are reproduced.