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Abstract

A comprehensive study of atmospheric turbulence over an urban surface has been carried out. Part II presents the normalized standard deviations of all important atmospheric variables from unstable conditions Measured at z'/z0=37 and analysed within the Monin-Obukhov similarity framework. They differ from the rural reference data in the following ways.

  • (1)
    The normalized standard deviation of vertical velocity is systematically smaller.
  • (2)
    The efficiency of urban transfer of heat and especially momentum are larger.
  • (3)
    The humidity statistics cannot be described within the similarity framework.

It is suggested that the roughness sublayer effects and large-scale space and time inhomogeneities of the motions in the suburban atmosphere are responsible for the observed dissimilarities.