Abstract

INTEREST in the structure of turbulent boundary layers and in particular mechanisms responsible for the transfer of turbulent energy and generation of Reynolds stress has recently been stimulated by a series of laboratory flow visualisation experiments1–5. These have indicated that Reynolds stress production is intermittent and associated with a sequence of motions known collectively as “bursting”3. Experimental evidence presented here suggests that similar motions can be readily identified in a geophysical boundary layer at length and time scales unattainable in the laboratory.

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