Evaluation of Boundary Layer Similarity Theory for Stable Conditions in CASES-99

Ha, Kyung-Ja; Hyun, Yu-Kyung; Oh, Hyun-Mi; Kim, Kyung-Eak; Mahrt, Larry
October 2007
Monthly Weather Review;Oct2007, Vol. 135 Issue 10, p3474
Academic Journal
The Monin–Obukhov similarity theory and a generalized formulation of the mixing length for the stable boundary layer are evaluated using the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) data. The large-scale wind forcing is classified into weak, intermediate, and strong winds. Although the stability parameter, z/L, is inversely dependent on the mean wind speed, the speed of the large-scale flow includes independent influences on the flux–gradient relationship. The dimensionless mean wind shear is found to obey existing stability functions when z/L is less than unity, particularly for the strong and intermediate wind classes. For weak mean winds and/or strong stability (z/L > 1), this similarity theory breaks down. Deviations from similarity theory are examined in terms of intermittency. A case study of a weak-wind night indicates important modulation of the turbulence flux by mesoscale motions of unknown origin.


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