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Some observations of turbulence structure in stable layers

1985; Wiley; Volume: 111; Issue: 469 Linguagem: Inglês

10.1256/smsqj.46907

1477-870X

J. C. R. Hunt, J. C. Kaimal, JE GAYNOR,

Fluid Dynamics and Turbulent Flows

Quarterly Journal of the Royal Meteorological SocietyVolume 111, Issue 469 p. 793-815 Article Some observations of turbulence structure in stable layers J. C. R. Hunt, J. C. R. Hunt Department of Applied Mathematics and Theoretical Physics, University of CambridgeSearch for more papers by this authorJ. C. Kaimal, J. C. Kaimal NOAA/ERL/Wave Propagation Laboratory, Boulder, Colorado 80303Search for more papers by this authorJ. E. Gaynor, J. E. Gaynor NOAA/ERL/Wave Propagation Laboratory, Boulder, Colorado 80303Search for more papers by this author J. C. R. Hunt, J. C. R. Hunt Department of Applied Mathematics and Theoretical Physics, University of CambridgeSearch for more papers by this authorJ. C. Kaimal, J. C. Kaimal NOAA/ERL/Wave Propagation Laboratory, Boulder, Colorado 80303Search for more papers by this authorJ. E. Gaynor, J. E. Gaynor NOAA/ERL/Wave Propagation Laboratory, Boulder, Colorado 80303Search for more papers by this author First published: July 1985 https://doi.org/10.1002/qj.49711146908Citations: 77AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Three days of measurements in stable conditions (Monin-Obukhov length L between 15 and 300 m) at the Boulder Atmospheric Observatory tower are presented. Winds came off the Rocky Mountains on two days and off the plains on the other day. Vertical profiles of the mean horizontal velocity and Brunt-Väisälä frequency N, and the standard deviation of the vertical component, ow, fluxes, spectra, cospectra, quadspectra, correlations and length scales are examined in this study. the measurements indicate that wave motion was present on all occasions, but which varied in strength, from weak to strong. New theoretical arguments are tested, which suggest that where the Richardson number is less than one, the velocity gradient dU/dz rather than N determines the integral scales Lx(w) of the vertical velocity fluctuations, i.e. Lx(w) ≃ ow/(dU/dz). But theory also suggests that it is not this scale, but the larger buoyancy scale ow/N that determines the temperature variance and thermal diffusivity. On this basis, dimensionless parameters are developed for plotting the measurements of temperature variance and thermal diffusivity. 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