Vertical profiles of wind speed and turbulence intensity in neutrally atmospheric boundary layers have conventionally been expressed by power law forms. Basic parameters in the power law expressions are examined using a series of numerical results for non-typhoon wind climates. The results show that:(i) The gradient height z
g is a function of the length scale U
g/f and the surface Rossby number R
0 (ii) The power law exponent αu for wind profile can be expressed approximately as a function of the roughness length z
0 (iii) The turbulence intensity(30) depends only on the roughness length z
0 (iv) The power law exponent αR for standard deviation σu decreases as the surface roughness increases. New formulas for these basic parameters, obtained from the numerical results, give better agreements with observed data than conventional formulas. For vertical profiles of wind speed and turbulence intensity, a comparison of the numerical results and those obtained from conventional forms is also performed to confirm the applicability and accuracy of these expressions. In Part 2 of this paper, characteristics of vertical profiles of wind speed and turbulence intensity during typhoons will be inv
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