On the Origin of Near-Surface Streaks in the Neutrally-Stratified Planetary Boundary Layer |
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| Authors: | Philippe Drobinski Ralph C Foster |
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| Institution: | (1) Department of Atmospheric Sciences, University of Washington, Box 351640, Seattle, WA, 98195-1640, U.S.A;(2) Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Box 354235, Seattle, WA, 98195-4235, U.S.A |
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| Abstract: | The dynamics of near-surface streak formation in the neutrallystratified, rotating planetary boundary layer areinvestigated. The purpose of this note is to compare large-eddysimulation results to theoretical predictions suggesting thatstreaks are associated with non-normal mode optimal perturbations.Streaks are regions near the surface of alternating high and lowspeed fluid organized into nearly linear bands, with horizontalspacing of several hundred metres, oriented up to 30° relativeto the geostrophic wind, that evolve through a continuous cycle ofgeneration, growth, decay and reformation. We find that the earlystages of streak formation and growth are consistent with thelinear theory. |
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| Keywords: | Large eddy simulation Near-surface streaks Non-modal perturbations Optimal perturbations |
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