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Large Eddies Regulate Turbulent Flux Gradients in Coupled Stable Boundary Layers
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2019
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Source: Geophysical Research Letters, 46(11), 6090-6100
[PDF-1.50 MB]
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Journal Title:Geophysical Research Letters
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Description:Due to strong mean wind shear, the stable boundary layer (SBL) becomes vertically coupled. In a coupled SBL, large turbulent eddies enhance cross ‐layer mixing and vertically mix turbulent kinetic energy. However, large gradients in momentum and heat fluxes are frequently observed, degrading the performance of Monin ‐Obukhov similarity theory. It is shown that increased vertical gradients of mean variables (i.e., wind speed and potential temperature) can cause flux gradients. This process is operated upon by downward penetrating large eddies with altered phase difference, contributing unevenly to fluxes and thus causing flux gradients. In the coupled SBL with small gradients in mean variables, large eddies are
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Source:Geophysical Research Letters, 46(11), 6090-6100
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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