PROPERTIES OF TURBULENT ENERGY SPECTRA AND COSPECTRA IN THE ATMOSPHERIC SURFACE LAYER.
Final rept. Dec 63-Jul 68,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METEOROLOGY
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The report describes turbulent energy spectra and cospectra, and other properties of turbulence in the atmospheric surface layer, obtained from an analysis of comprehensive field measurements made over a period of several years at the Round Hill Field Station. Representative power spectra of air temperature and the orthogonal compoenents of wind velocity and cospectra of the vertical fluxes of sensible heat and momentum are presented for the frequency band from 0.4 to 0.0015 cycles per second. The dependence of the spectra and cospectra on height above ground thermal stratification, and surface roughness is discussed. Calculations of the scales of turbulence and energy dissipation rates are summarized and the correspondence between the measured properties of turbulence structure and various Similarity Theory predictions is outlined. Author