Exploring the Possible Role of Small-Scale Terrain Drag on Stable Boundary Layers over Land Public Deposited

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  • This paper addresses the possible role of unresolved terrain drag, relative to the turbulent drag on the development of the stable atmospheric boundary layer over land. Adding a first-order estimate for terrain drag to the turbulent drag appears to provide drag that is similar to the enhanced turbulent drag obtained with the so-called long-tail mixing functions. These functions are currently used in many operational models for weather and climate, although they lack a clear physical basis. Consequently, a simple and practical quasi-empirical parameterization of terrain drag divergence for use in large-scale models is proposed and is tested in a column mode. As an outcome, the cross-isobaric mass flow (a measure for cyclone filling) with the new scheme, using realistic turbulent drag, appears to be equal to what is found with the unphysical long-tail scheme. At the same time, the new scheme produces a much more realistic less-deep boundary layer than is obtained by using the long-tail mixing function.
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  • Steeneveld, G. J., A. A. M. Holtslag, C. J. Nappo, B. J. H. van de Wiel, L. Mahrt, 2008: Exploring the Possible Role of Small-Scale Terrain Drag on Stable Boundary Layers over Land. Journal of Applied Meteorology and Climatology, 47, 2518–2530.
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  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2012-02-22T22:34:13Z No. of bitstreams: 1 MahrtL.CEOAS.ExploringPossibleRole.pdf: 942743 bytes, checksum: 0acfb46b857267408256dfda4ef63c8a (MD5)
  • description.provenance : Made available in DSpace on 2012-02-22T22:34:13Z (GMT). No. of bitstreams: 1 MahrtL.CEOAS.ExploringPossibleRole.pdf: 942743 bytes, checksum: 0acfb46b857267408256dfda4ef63c8a (MD5) Previous issue date: 2008-10

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