Spatial coherence of temperature fluctuations in the atmospheric surface layer |
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| Authors: | D Phong-Anant A J Chambers R A Antonia |
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| Institution: | (1) Department of Mechanical Engineering, University of Newcastle, 2308 Newcastle, N.S.W., Australia |
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| Abstract: | Simultaneous temperature fluctuations have been measured along directions both parallel and orthogonal to the wind direction in the atmospheric surface layer. Ensemble-averaged temperature distributions associated with the ramp-like feature observed in instantaneous temperature traces indicate that the average duration of the ramp is approximately independent of height. Application of Davenport's geometric similarity of coherence of temperature fluctuations yields approximate estimates for the spatial extent of the structure characterized by the ramp. The longitudinal extent is approximately 12 times the vertical extent and 17 times the lateral extent. |
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