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The spectrum of vertical velocity near the surface
Author(s) -
Panofsky H. A.,
McCormick R. A.
Publication year - 1960
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.49708637006
Subject(s) - turbulence , wind speed , spectrum (functional analysis) , geometry , invariant (physics) , physics , mechanics , meteorology , spectral line , scale (ratio) , roughness length , atmospheric sciences , lapse rate , vertical velocity , mathematics , geology , geodesy , wind profile power law , astronomy , quantum mechanics , mathematical physics
Observations of a considerable number of vertical‐velocity spectra are combined to show that under near‐neutral and unstable conditions, the shape of the spectrum is essentially invariant up to heights of order 100 m, and the ‘scale’ of turbulence is proportional to height within this régime. A semi‐empirical working hypothesis is suggested which relates the spectrum to wind speed, lapse rate, height and roughness.