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Short‐range vertical diffusion in stable conditions
Author(s) -
Thompson N.
Publication year - 1965
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.49709138807
Subject(s) - turbulence , diffusion , range (aeronautics) , stability (learning theory) , eulerian path , mechanics , meteorology , crosswind , mathematics , environmental science , atmospheric sciences , physics , lagrangian , mathematical analysis , thermodynamics , materials science , computer science , machine learning , composite material
Experiments have been carried out to determine vertical diffusion in stable conditions at distances of 100 or 200 m from a continuous cross‐wind line source. Simultaneous measurements of vertical turbulence provide the opportunity to test an empirical method of estimating diffusion from wind fluctuation measurements, based essentially on the ideas of Hay and Pasquill (1959), but also attempting to take into account the variation of turbulence with height. The results suggest a fairly systematic variation with stability of the ratio of the Lagrangian and Eulerian scales of turbulence, from values of about two in near neutral stability, to at least ten in rather stable conditions.